[Rails] Edit With Nested Forms - Values Not Preserved Across Submit

[MaggotChild]

When a nested form submitted to the create action contains missing
data, the form is redisplayed and the nested values the user entered
remain. When submitting the same nested  form to the update action,
the newly entered values remain for the parent record, but the child
records revert back to their pre edit values.

Here's the form (from Rails Guides):

% form_for @customer do |customer_form| %
  div
%= customer_form.label :name, 'Customer Name:' %
%= customer_form.text_field :name %
  /div

  % customer_form.fields_for :orders do |order_form| %
p
  div
%= order_form.label :number, 'Order Number:' %
%= order_form.text_field :number %
  /div


  % unless order_form.object.new_record? %
div
  %= order_form.label :_delete, 'Remove:' %
  %= order_form.check_box :_delete %
/div
  % end %
/p
  % end %

  %= customer_form.submit %
% end %


It looks like this is a problem with accepts_nested_attributes_for. It
loads and updates the records in the nested form, but when the  form
is redisplayed @customer.orders is loaded from the DB, squashing the
changes by the nested attributes module.

Is it possible to retain nested data across form redisplays to the
update action?


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[Rails] Re: Edit With Nested Forms - Values Not Preserved Across Submit

[MaggotChild]

On Mar 25, 12:07 am, MaggotChild hsomob1...@yahoo.com wrote:

 Is it possible to retain nested data across form redisplays to the
 update action?

Anyone?

The answer appears to be no, given the Rails Guides example and the
Complex Forms Examples: github.com/alloy/complex-form-examples/tarball/
master. This is a big downside to using nested attributes with complex
forms.



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[Rails] Rails Strives For DRY. A Lot of REST Routes, Not So DRY.

[MaggotChild]

Most in the Rails community seem stick with 1 controller per resource
when using RESTfull routes.
This makes sense for a resource with one scope and one view, but once
a resource is used with multiple scopes and/or views  the amount of
code duplication needed to manage these in a single controller can
balloon quick. Yet despite the impending  chaos, it seems as though
people prefer to maintain a controller per resource.

Take these examples from Rails sites written by well respected
authors:

1. http://tinyurl.com/2d9rl3v

find_container() and find_events(): why would one want to do this?
This can become unmanageable. If each of these scopes require
different view components the same checks will have to be done in the
action's view or when determining the layout.

2. http://tinyurl.com/2679ye3

Look at how many times wall? and blog? have to be called. Not very DRY
if you ask me.
Rail's routing gives you these checks for free, why not create a
WallCommentsController and BlogCommentsController? If differing views
are involved for each of these it seems like a no brainer... but it's
never done. Why? What am I missing?




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[Rails] Users Uploading Files To An asset_host

[MaggotChild]

I'm curious how people put static files uploaded by users to their
asset host.

I'd think (for non S3, CloudFiles, etc...)  that the files would be
submitted to the app server which would save them to a shared drive on
the asset host. I've head bad things about NFS and high volume sites.
Is Samba is an acceptable alternative?

Putting part of the app on the asset host and submitting directly to
it makes some sense, though it somewhat defeats the separation of app
server, asset host, etc...

How are you guys handling this?

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[Rails] HABTM collection_ids: confirm changes before saving

[MaggotChild]

It seems that when a HABTM (or has many) is involved, having a
confirmation page prior to saving doesn't work as seamlessly as other
Rails view/model parings, specifically when confirming an edit. This
is caused by the immediate inserts or deletes that take place upon
assigning to collection_ids.  Changes are saved regardless of whether
the user wants to cancel or proceed.

select_tag 'product[provider_ids][]', collection_options_with_selected
#pseudo

def preview
  @product = Product.find params[:id]
  @product.attributes = params[:product]  #provider_ids saved here

  if @product.valid?
render 'confirm;
  else
render 'edit'
  end
end

build is not appropriate and push has the same functionality as
assigning to provider_ids.
So I have to do this:

def preview
  @product = Product.find params[:id]
  @product.attributes = params[:product]  #no product

  @selected_providers = Provider.find_by_ids params[:provider_ids]
#to display provider names in confirm page
  #...
end

def update
  @product = Product.find params[:id]
  @product.attributes = params[:product]
  @provider_ids = params[:provider_ids]

  if @product.valid?
Product.transaction do
  @product.provider_ids = @provider_ids
  @product.save
end
  else ...
end

There's no way to do this in the typical Rails attribute assignment
fashion?

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[Rails] Re: HABTM collection_ids: confirm changes before saving

[MaggotChild]

On Dec 31, 11:08 am, MaggotChild hsomob1...@yahoo.com wrote:
 def preview
   @product = Product.find params[:id]
   @product.attributes = params[:product]  #no product

I meant that no provider_ids are included in params

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[Rails] Using current_page? With An Edit Route

[MaggotChild]

current_page?(:action = 'edit', :controller = 'admin/products')
fails with an ActionView::TemplateError (No route matches ...) unless
I'm in the edit action or I provide the :id.

Route:
/admin/products/:id/edit(.:format) {:action = 'edit', :controller =
'admin/products'}

I understand why this happens, but is there a way to make
current_page? check for edit routes without specifying an id?

Thanks

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[Rails] db:test:purge And osql: What Happened?

[MaggotChild]

I thought I had read somewhere why db:test:purge continues to use
`osql` but all I could find is this:
http://dev.rubyonrails.org/ticket/7054

Obviously this never made its way into Rails. Why? What are people
doing for MS SQL testing on non Windows OS'? Everyone's hacking their
own workaround? Seems as if there would be a universal antidote.

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[Rails] Has Many Relationship: collection_ids= Method Useless?

[MaggotChild]

When modifying a model that has a has_one or has_many relationship
people usually create form that will submit the id of the  selected
associated object. Rails takes this into consideration with
validations: validate_presence_of  :country will validate if  country
or country_id has been set.

In Rails, providing the associated ID works fine with has_one but if
you try to do this with a has_many:

form_for(@country) do |form|
  form.select :state_ids, @states
  form.select :state_ids, @states
  #etc...

The selected state_ids are written to the DB as soon as they're
assigned. What's the reasoning behind this?
How is one supposed to assign multiple collection ids via a form?

accepts_nested_attributes_for doesn't work out too well either because
you're just setting IDs -a field that is explicitly ignored by
accepts_nested except when testing whether or not the given params are
new.

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[Rails] Re: Has Many Relationship: collection_ids= Method Useless?

[MaggotChild]

On Nov 14, 2:42 am, Leonardo Mateo leonardoma...@gmail.com wrote:
 On Sat, Nov 14, 2009 at 6:37 AM, MaggotChild hsomob1...@yahoo.com wrote:
  In Rails, providing the associated ID works fine with has_one but if
  you try to do this with a has_many:

  form_for(@country) do |form|
   form.select :state_ids, @states
   form.select :state_ids, @states
   #etc...

  The selected state_ids are written to the DB as soon as they're
  assigned. What's the reasoning behind this?
  How is one supposed to assign multiple collection ids via a form?

 You have to send them as an array, and assign them as an array too.

 For example,
 View
 form.select(state_ids[], @states)
 form.select(state_ids[], @states)

 Controller
 @whatever.state_ids = params[:state_ids]

That's the problem. As soon as you make that assignment the IDs are
written to the db. You'd have to say:
Whatever.tranaction do
  @what = Whatever.new(params[:whatever])
  #other stuff
  if @what.valid? 
end

Which can result in an unnecessarily large transaction scope. Though
this is somewhat expected since  and co. also write to the DB on
assignment.
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[Rails] Nested Attributes For HABTM - Deleting The Right Record

[MaggotChild]

In a many-to-many relationship, defined via has_and_belongs_to_many,
accepts_nested_attributes_for deletes the wrong record(s) when
marked_for_destruction? == true.

For example:

class Ho  AR
  has_and_belongs_to_many :strolls, :join_table = :ho_strolls
  accepts_nested_attributes_for :strolls, :allow_destroy = true
end

class Stroll  AR
  has_and_belongs_to_many :hos, :join_table = :ho_strolls
end

attribs = {1={_delete=1, :id=123}}

h=Ho.first
h.strolls_attributes  = attribs
h.save!

This will delete Stroll with an id of 123 from the join table and the
strolls table.
This is wrong. It should only be deleted from the ho_strolls table.
Though I believe there is a fix (or a debate still, maybe) on the way:
https://rails.lighthouseapp.com/projects/8994/tickets/2251-associationcollectiondestroy-should-only-delete-join-table-records

At any rate, I have the following work around. It assumes that I'll
never delete a stroll from the strolls tables  via a hoe. What do you
think?

class Ho  AR
  has_and_belongs_to_many :strolls, :join_table = :ho_strolls
  accepts_nested_attributes_for :strolls, :allow_destroy = true

  def before_save
remove_marked_strolls
  end

  def remove_marked_strolls
marked = strolls.select { |stroll|
stroll.marked_for_destruction? }
marked.each { |stroll| stroll.delete(stroll) } #delete from join
table only
  end
end

I though about doing:

class Stroll  AR
...
def unmark_for_deletion; @marked_for_deletion = false; end
end

And then unmarking in remove_marked_strolls, though this seems
superfluous since the records are remove from the collection the proxy
will never get to check for this condition and delete them from
strolls.
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[Rails] Re: Select Option Broken on Eager Load With 2nd Order Association

[MaggotChild]

On Oct 15, 12:22 am, Frederick Cheung frederick.che...@gmail.com
wrote:
 On Oct 15, 3:13 am, MaggotChild hsomob1...@yahoo.com wrote:
  dont_select_me is included. The docs say nothing of about :select
  being stepped on by fall back left joins (not the :include!). This
  seems like a bug

 Well the docs should say that - it has always been that way. You need
 something likehttp://www.kellogg-assoc.com/2006/11/05/eager-finder-sql

Thanks, that's what I need.
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[Rails] Select Option Broken on Eager Load With 2nd Order Association

[MaggotChild]

I only want to select certain columns when eager loading an
association:

class Package  ActiveRecord::Base
 has_many :deliveries,
  :select='id, name, region_id, package_id',   #exclude text
column dont_select_me
  :include=:region
end

class Delivery  ActiveRecord::Base
  belongs_to :package
  belongs_to :region
end

Package.first :include = :deliveries

Generates the correct SQL:
SELECT TOP 1 * FROM [packages]
SELECT id, name, region_id, package_id FROM [deliveries] WHERE
([deliveries].package_id = 1)
SELECT * FROM [regions] WHERE ([regions].[id] = 1)

But, when I say:

Package.first :include = :deliveries, :conditions = deliveries.name
= 'shlomo'

The SQL is:

SELECT [packages].[id] AS t0_r0, [packages].[name] AS t0_r1,
[packages].[created_at] AS t0_r2,
  [packages].[updated_at] AS t0_r3, [deliveries].[id] AS t1_r0,
[deliveries].[name] AS t1_r1,
  [deliveries].[created_at] AS t1_r2, [deliveries].[updated_at] AS
t1_r3, [deliveries].[dont_select_me] AS t1_r4,
  [deliveries].[region_id] AS t1_r5, [deliveries].[package_id] AS
t1_r6
FROM [packages] LEFT OUTER JOIN [deliveries] ON deliveries.package_id
= packages.id WHERE (deliveries.name = delivery) AND [packages].id
IN (1)

dont_select_me is included. The docs say nothing of about :select
being stepped on by fall back left joins (not the :include!). This
seems like a bug.









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[Rails] Re: Eager Loading a Relationship That Has No PK/FK

[MaggotChild]

On Oct 8, 4:25 pm, Frederick Cheung frederick.che...@gmail.com
wrote:
 On Oct 9, 12:01 am, MaggotChild hsomob1...@yahoo.com wrote:
  A Segment is linked to Media by Media.name, which is the result of
  concatenating Segment.name and Segment.part. As I said there are is no
  PK/PK relation so the actual Segment class looks like this:

  class Segment  AR::Base
    def media
      @media ||= Media.find_by_name(#{name}%02d % part)
    end
  end

  This leaves me stuck with a  N+1 select problem because I can't say:
  Segment.all :include = :media

 I think you'll find it hard to get that exactly to work. It shouldn't
 be hard however to do

 shows = Show.all :include = :segment
 load_media(shows.collect {|s| s.segment})

 your load_media function will need to iterate over the segments,
 construct all the names, load those segments and then assign to each
 segment what its media is

Hi Fred,

  The problem with that is the location of load_media(). Load media
needs to be inside of Show, as it's responsible for loading a Show
and  it's Segments. Anyone client using a Show finder would now need
the load_media() function. Plus load_media() is really doing what AR's
association_preload is already doing.

  I figured out that there is actually an easy solution for this (too
bad I'm using the CPK module which fails to support it  -omitted for
brevity):

class Segment  AR::Base
  belongs_to :show
  has_one :media, :primary_key = :media_name

  def media_name
#{name}%02d % part
  end
end

Thanks!

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[Rails] Re: Eager Loading a Relationship That Has No PK/FK

[MaggotChild]

On Oct 9, 10:24 am, Marnen Laibow-Koser rails-mailing-l...@andreas-
s.net wrote:
 MaggotChild wrote:
  I'm attempting to wrestle an old DB into Rails.
  This relationship is giving me trouble:

  class Show  AR::Base
    has_many :segments
  end

  class Segment  AR::Base
    belongs_to :show
    has_one :media  #this has no PK/FK relation
  end

  A Segment is linked to Media by Media.name, which is the result of
  concatenating Segment.name and Segment.part. As I said there are is no
  PK/PK relation so the actual Segment class looks like this:

  class Segment  AR::Base
    def media
      @media ||= Media.find_by_name(#{name}%02d % part)
    end
  end

  This leaves me stuck with a  N+1 select problem because I can't say:
  Segment.all :include = :media

 The easiest thing to do would be to modify the media table so as to
 declare the name to be primary key.  

Hi Maren,

  Modifying the DB isn't possible but I could use the :primary_key
options to has one:

class Segment  AR::Base
  belongs_to :show
  has_one :media, :primary_key = :media_name

  def media_name
#{name}%02d % part
  end
end

Thanks!
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[Rails] Eager Loading a Relationship That Has No PK/FK

[MaggotChild]

I'm attempting to wrestle an old DB into Rails.
This relationship is giving me trouble:

class Show  AR::Base
  has_many :segments
end

class Segment  AR::Base
  belongs_to :show
  has_one :media  #this has no PK/FK relation
end

A Segment is linked to Media by Media.name, which is the result of
concatenating Segment.name and Segment.part. As I said there are is no
PK/PK relation so the actual Segment class looks like this:

class Segment  AR::Base
  def media
@media ||= Media.find_by_name(#{name}%02d % part)
  end
end

This leaves me stuck with a  N+1 select problem because I can't say:
Segment.all :include = :media

or

Show.all :include = {:segment=:media}

How to get around the N+1? select problem and eager load Media?

In the case of Show.all, Show and Media have a relation (yes bad
schema) so I was thinking I could pull all the
Media after a the Segment collection is loaded by Show and assign them
to the Segments accordingly.
But, while there is an after_find, this is applied after each object
and not after the collection.

Any ideas?

Thanks

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[Rails] Running Unit Tests With SphinxSE

[MaggotChild]

Several of my unit tests run queries against SphinxSE. Since Rails
creates the test DB by dumping the dev DB schema, my SphinxSE queries
aren't run against the test DB.

There seems to be no way to hook into the test:clone_structure task,
so I thought that I'll just have the appropriate unit tests include
this:

module SphinxTest
  @@index = 'ct_test_index'
  mattr_accessor :index, :host, :port

  self  class
def included(klass)
   alter_test_table unless
end

#MySQL specific
def alter_test_table
  return unless ActiveRecord::Base.connection.table_exists?
(Query::TABLE_SPHINX)

  create = ActiveRecord::Base.connection.select_value show create
table #{Query::TABLE_SPHINX}
  if @@index  md = create.match %r|sphinx://([-.\w]+):(\d+)?/[-
\w]+|
host = @@host || md[0]
port = @@port || md[1]

alter = %|alter table #{Query::TABLE_SPHINX}
connection=sphinx://#{host}:#{port}/#{@@index}|
ActiveRecord::Base.connection.execute alter
  end
end
  end
end

does anyone know of way to do this from outside my unit tests?

On a side note, assuming portability was an issue, there seems to be
know way to get the TableDefinition from the connection. Is this
really the case?

Thanks
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[Rails] Re: Overriding AR read/write_attribute - Overridden write_attribute Is Never Called

[MaggotChild]

On Sep 24, 12:34 am, Frederick Cheung frederick.che...@gmail.com
wrote:
 On Sep 23, 11:27 pm, MaggotChild hsomob1...@yahoo.com wrote:

  Could someone explain this?

 At a quick glance it is probably because after AttributeMethods is
 included in ActiveRecord::Base, write_attribute is aliased 
 overwridden (eg the change tracking module). You then change
 write_attribute on AttributeMethods but it is too late - the aliasing
 that occured in Dirty is pointing at the previous implementation. When
 you alias a method ruby does keep track of what the aliased method was
 at the time alias_method was called, for example:

 class Foo
   def to_be_aliased
     implementation 1
   end
   alias_method :old_implementation, :to_be_aliased
 end

 class Foo
   def to_be_aliased
      implementation 2
   end
 end

 Foo.new.old_implementation #= implementation 1


Hi Fred,

Thanks for your response. I think you're on to something and I'll have
to take a look a the Dirty module (amongst others). But, even if the
module was aliasing the original write_attribute, I don't see how this
would interfere with my redefinition.

write_attribute is at the top of the call stack so I'd think it's
going to use the most recent definition. Unless some other module
redefined write_attribute within the scope of active AR::Base (as
apposed to including it via a module) -which is possible.


Using your example, I believe the case is more like the following:

class Foo
  def to_be_aliased
p implementation 1
  end
  alias_method :old_implementation, :to_be_aliased
end

class Foo
  def to_be_aliased
p implementation 2
  end
end

Foo.new.to_be_aliased #implementation 2

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[Rails] Re: Overriding AR read/write_attribute - Overridden write_attribute Is Never Called

[MaggotChild]

On Sep 24, 5:40 pm, MaggotChild hsomob1...@yahoo.com wrote:
 write_attribute is at the top of the call stack so I'd think it's
 going to use the most recent definition. Unless some other module
 redefined write_attribute within the scope of active AR::Base (as
 apposed to including it via a module) -which is possible.

Yes, this is what happens, the alias is performed in a class_eval
block giving it presidency over my attempted override in the module.

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[Rails] Overriding AR read/write_attribute - Overridden write_attribute Is Never Called

[MaggotChild]

Could someone explain this?

#config/initializers/ar_attributes.rb

module ActiveRecord
  module AttributeMethods

  alias_method :ar_read_attribute, :read_attribute
  def read_attribute(attr_name)
p read_override
ar_read_attribute(attr_name)
  end

  alias_method :ar_write_attribute, :write_attribute
  def write_attribute(attr_name, value)
raise 'You made it!'
  end
  end
end

In the Rails console:

 person.read_attribute :name

read_override
= Joe
 person.write_attribute :name, Bilal
= Bilal
 person.read_attribute :name

read_override
= Bilal
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[Rails] Re: App Setting, Where To Put: environment.rb, initializer.rb, lib..?

[MaggotChild]

Thanks!

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[Rails] App Setting, Where To Put: environment.rb, initializer.rb, lib..?

[MaggotChild]

I have a path that my model (Audio) uses to r/w files. This path
differs between production, test, and dev.

Audio includes a module that overrides some ActiveRecord methods.
This module is contained in  config/initializers.

I'd like to set the Audio directory based on my environment, but using
the given environment files fail because the module included by Audio
hasn't been loaded. Of course I could just require it, but this made
me think that maybe the initilaizers directory isn't the right place
to put my AR overrides, and the environment file isn't the right place
to put my non-Rails related environment settings. Is this the case?

It seems as though I should set the directory in it's own initializer
based on RAILS_ENV... but Rails is already doing this for me with the
given environment files


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[Rails] Routes With Same URL Mapped To Different Actions

[MaggotChild]

Can't find the answer to this. My old message received no responses
(subject was messed up).

Is it possible to create routes that have the same URL yet map to a
different action based on the HTTP method (or pseudo method) like a
Rails' resource?

For example:

map.resources :foo, :collection = { :purge  = :get, :purge_them
= :post }

I'd like to use /foo/purge for both actions, and have the appropriate
controller method called based on the HTTP request's method -like /foo
does for the create and index methods, amongst others.
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[Rails] Custom Routes: Determining Action Named Based On Method

[MaggotChild]

Is it possible to create routes that have the same URL yet map to a
different action based on the HTTP method (or pseudo method)?

For example:

map.resources :foo, :collection = { :purge  = :get, :purge_them
= :post }

I'd like to use /foo/purge for both actions, and have the appropriate
controller method called based on the HTTP request's method -like /foo
does for create and index, amongst others.




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[Rails] HTTP Auth 401 Even on Valid Login

[MaggotChild]

I can't understand why authenticate_or_request_with_http_basic keeps
failing even though I am entering the correct info.

If I try to access /admin/items/new, I enter the correct info but I
keep getting prompted.

The strange part is that when I cancel out, I get HTTP Basic: Acce.

Here's the controllers:

class Admin::BaseController  ApplicationController
  before_filter :authenticate
  def authenticate
authenticate_or_request_with_http_basic do |name, pass|
name == 'h'  pass == 'x'
end
  end
end

class Admin::ItemsController  Admin::BaseController
  def new
@item = Item.new
@category = 'New Item'
@categories = Category.find :all, :order='name'
  end

  #etc...
end

The log:

Processing ItemsController#new (for localhost at 2009-05-03 12:20:05)
[GET]
  Session ID:
BAh7CDoSYXV0aGVudGljYXRlZFQ6DGNzcmZfaWQiJTYxZjNiYjBlY2Q2MWYz
MTA3ZmQ0Y2ZiOTFhMmRlMWQxIgpmbGFzaElDOidBY3Rpb25Db250cm9sbGVy
OjpGbGFzaDo6Rmxhc2hIYXNoewAGOgpAdXNlZHsA--
f03480a81df51ccf0c5d4a2a6e80f3aad10366cc
  Parameters: {action=new, controller=admin/items}
Filter chain halted as [:authenticate] rendered_or_redirected.
Completed in 0.00136 (733 reqs/sec) | Rendering: 0.00112 (82%) | DB:
0.0 (0%) | 401 Unauthorized [http://localhost/admin/items/new]

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[Rails] Overriding a Relationships Propertry

[MaggotChild]

I have a child relationship that is denormalized. I want to normalize
it at the object level once it's retrieved:

class Parent
  has_many :denormalized_children,  :class_name='Child'

  def children
if @normalized_children.nil?
   @normalized_children = []
   denormalized_children.group_by(:number).each { |c|
@normalized_children  NormalizedChild.new(c)
   }
end
@normalized_children
  end
end

This works fine, but I don't want to eager load them
as :denormalized_children. I'd like to use :children. So I tried:

class Parent
  has_many :children

  alias :denormalized_children :children
  def children
  #Same definition
  end
end


AR doesn't like this as it expects the children prop to return
something that responds to loaded.

has_many :children, :group='number'

doesnt work either since it discards all but  N unique numbers. So if
I have 10 with number 1 and 5 with number 2 I'll only get back 2
children.

Is there any way to do this without having to change the name of the
relationship?

I can't use after_load  (or whatever it's called) in the Child class
since the children need to be grouped by their relationship to their
parent.

Any suggestions would be great.

Thanks
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[Rails] Creating/Updating Models from text/xml Requests

[MaggotChild]

I'm curious how others would deal with this situation.

In my case, I have:

class Package
  has_many :deliveries
end

class Delivery
  belongs_to :package
  belongs_to :region
end

class Region
  has_many :deliveries
end

And accept XML requests in the following manner:

package
  nameGood Shipmentname
  !-- snip other fields --
  deliveries
delivery
  statusFailure/status
  region
nameUS/name
  /region
/delivery
delivery
  statusUnknown/status
  region
nameFR/name
  /region
/delivery
  /deliveries
/package

Now, my controller would look something like this ugly beast:

class PackagesController
  def create
if package = params[:package]
  package = Package.find_or_initialize_by_name(package)
  if deliveries = package.delete(:deliveries)
 deliveries.each do |d|
 region = d.delete(:region)
 region = Region.find_or_create_by_name(region[:name])
 break if region.nil?
 package.deliveries.create(region)
 package.deliveries[-1].region = region
 end
  end
end
#save and more...
  end
end

As one can see, this is horrible for several reasons. One of the big
ones being request validation and error handling.

Overriding package.from_xml  is an option, but I find myself thinking
that I should be validating against request.body with say a DTD, as
opposed to picking apart the params hash. (Though I'll have to pick it
apart anyways to create the models...)

Then I find my self thinking that creating a course grained validation
method like a DTD is stupid since I have my fine grain validation
logic within the given models.

Yes, I've heard of ROXML.

Any thoughts?





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[Rails] Re: Multiple foreign keys create / destroy

[MaggotChild]

 class House  ActiveRecord::Base
     belongs_to :country
     belongs_to :cities
     belongs_to :streets
 end

 Now...if i want to create a house like this:

 @street = Street.find(1)
 @house = @street.houses.new
 @house.name = Burlington house
 @house.save

 Now...only the street_id key is set in the house record...But not
 city_id and country_id...
 Is there an ORM way to let active record do the job ?

That is the ORM way. The problem lies in your design (i.e.
associations).

A country has many cities. Cities have many streets. These streets
contain houses.
Sure a house belongs to a city, but given the additional entities
involved the above model makes more sense.

@house = some_city.streets.find(1).houses.create(:name='Adelitas')

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[Rails] Collection of Partials, :as Option No Good, TemplateError

[MaggotChild]

I'm trying to render a collection of partials using :as. It raises an
undefined local variable exception. Not sure why:

~/delivery-log/app/views/packages $ ls -1
_package.html.erb
_package_list.html.erb
index.html.erb


index.html.erb:
%=
render :partial='package_list', :collection=@packages, :as=:package
%

_package_list.html.erb:
tr
  td%= package.upc %/td
/tr

Seems simple, but it only raises the aforementioned exception:

ActionView::TemplateError (undefined local variable or method
`package' for #ActionView::Base:0xb7589ac8) on line #2 of packages/
_package_list.html.erb:
1: tr
2:   td%= package.upc %/td
3: /tr

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[Rails] Re: Collection of Partials, :as Option No Good, TemplateError

[MaggotChild]

On Feb 24, 11:54 am, Eric ericgh...@gmail.com wrote:
 On Feb 24, 11:13 am, MaggotChild hsomob1...@yahoo.com wrote:
  I'm trying to render a collection of partials using :as. It raises an
  undefined local variable exception. Not sure why:
 Why not use :locals = ?

Sure there a workarounds, but they don't explain why :as won't work.

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[Rails] Re: ActiveRecord Unexplainable SystemStackError - Only in WEBrick

[MaggotChild]

On Feb 3, 2:18 pm, Frederick Cheung frederick.che...@gmail.com
wrote:
 On Feb 3, 7:33 pm, MaggotChild hsomob1...@yahoo.com wrote:
  On Feb 2, 2:54 pm, Frederick Cheung frederick.che...@gmail.com
   Does it only happen when class caches is false ?
  Why yes Fredrick, it does.
 That pretty much means that the automated reloading is bollocksed.

OK, I understand this require_dependency thing but in my case I don't
see how this applies.
I thought that this code, in my lib dir, might be the cause:

require 'activerecord'
class Validator  ActiveRecord::Base
  def self.columns
@columns ||= [];
  end
  #snip ...
end

require 'validator'
class SearchCriteria  Validator
 #snip attribs
end

But, the source of my pain, this call:

Package.search(criteria)

executes:

 SHOW FIELDS FROM `packages`
  Delivery Load (0.000409)   SELECT `deliveries`.* FROM `deliveries`
WHERE (`deliveries`.package_id IN (319089123))
  Delivery Columns (0.000961)   SHOW FIELDS FROM `deliveries`
  Region Load (0.000370)   SELECT * FROM `regions` WHERE (`regions`.id
IN ('4803144','5750247'))

when the Delivery class is being assembled by ActiveRecord -
SystemStackError

 This has nothing to do with the above classes and or
require_dependency... I think.

class Package  ActiveRecord::Base
  has_many :deliveries,  #,:select='id, user, host, delivered,
region_id, package_id',
  :include=:region,
  :dependent=:delete_all

 def self.search(criteria)
raise ArgumentError, 'argument must be of type SearchCriteria'
unless criteria.is_a?(SearchCriteria)
clause = build_search_where_clause(criteria)
find(:all, :include=[:deliveries], :conditions=clause)
 end

 def self.build_search_where_clause(criteria)
   where = []
   [:region,:date,:status].each do |prop|
   case prop
  when :region
 where  send(:sanitize_sql, [ 'deliveries.region_id in (?)',
value ])
  #snip clauses
   end
   where.join(' and ')
end

class Delivery  ActiveRecord::Base
  belongs_to :package
  belongs_to :region
end

class Region  ActiveRecord::Base
  has_many :deliveries
end

I'm at a loss -still.

Thanks for your help.
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[Rails] Re: ActiveRecord Unexplainable SystemStackError - Only in WEBrick

[MaggotChild]

On Feb 3, 7:20 pm, Alan Brown stre...@gmail.com wrote:
 So how is the conditions clause built.  can you log it before passing it to
 find?

Yes I can see the clause in the development log. The query is valid,
it executes fine. It's when the Delivery class is assembled by
ActiveRecord that the stack exception occurs, Well, only when the
action is processed by  WEBrick.
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[Rails] Re: ActiveRecord Unexplainable SystemStackError - Only in WEBrick

[MaggotChild]

On Feb 2, 2:54 pm, Frederick Cheung frederick.che...@gmail.com
wrote:
  On Feb 2, 1:33 pm, Ryan Bigg radarliste...@gmail.com wrote:
  Why not use a search plugin like thinking sphinx to do your searching
  for you?

  Overkill. The searching is rudimentary so I just quickly created
  something.

  In any case, I take it you had no thoughts as to why I'm receiving the
  stack error -other than possibly implying it was because of the
  SearchCriteria class?

 Does it only happen when class caches is false ?

Why yes Fredrick, it does.  I wonder why that can be. Your thoughts
would be appreciated.

Regardless, you have provided me with a new area to look into.

Thanks!

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[Rails] ActiveRecord Unexplainable SystemStackError - Only in WEBrick

[MaggotChild]

This SystemStackError  is driving me crazy. It only takes place when
testing with WEBrick - I can't reproduce it with any tests. It is
caused by calling the missing id method (base.rb:2435) on my
ActiveRecord class.

WEBrick and my tests are running as the same user, with a `ulimit -s`
of 10240. Plus the query works sometimes so I don't think this
matters.

Here's the trace:

/usr/lib/ruby/1.8/set.rb:93:in `empty?'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
attribute_methods.rb:64:in `generated_methods?'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
attribute_methods.rb:237:in `method_missing'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
attribute_methods.rb:245:in `method_missing'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
base.rb:2435:in `hash'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:13:in `uniq'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:13:in `preload_associations'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
base.rb:1343:in `find_every'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
base.rb:536:in `find'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:254:in `find_associated_records'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:154:in `preload_has_many_association'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:40:in `send'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:40:in `preload_one_association'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:38:in `each'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:38:in `preload_one_association'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:17:in `preload_associations'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:16:in `preload_associations'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:16:in `each'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
association_preload.rb:16:in `preload_associations'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
base.rb:1343:in `find_every'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
base.rb:536:in `find'
app/models/package.rb:29:in `search'


The thing is, sometimes it works -at first. And usually results in the
trace ending before Set.empty?
at:
/usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/
attribute_methods.rb:64:in

Here's the relevant parts of my code:

class Package  ActiveRecord::Base
  has_many :deliveries,  #,:select='id, user, host, delivered,
region_id, package_id',
  :include=:region,
  :dependent=:delete_all

 def self.search(criteria)
   raise ArgumentError, 'argument must be of type SearchCriteria'
unless criteria.is_a\
?(SearchCriteria)
clause = build_search_where_clause(criteria)
find(:all, :include=[:deliveries], :conditions=clause)
 end
end

class Delivery  ActiveRecord::Base
  belongs_to :package
  belongs_to :region
end

class Region  ActiveRecord::Base
  has_many :deliveries
end

Looking at the SQL output, the exception is occurring after
the :deliveries relation is queried.
At first I though it was because I left out the id field from the
has_many :deliveries, :select='...'
But I commented it out and still no luck.

Any suggestions/ideas are greatly appreciated.






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[Rails] Re: ActiveRecord Unexplainable SystemStackError - Only in WEBrick

[MaggotChild]

On Feb 2, 1:33 pm, Ryan Bigg radarliste...@gmail.com wrote:
 Why not use a search plugin like thinking sphinx to do your searching
 for you?

Overkill. The searching is rudimentary so I just quickly created
something.

In any case, I take it you had no thoughts as to why I'm receiving the
stack error -other than possibly implying it was because of the
SearchCriteria class?

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[Rails] Route Collections and HTTP methods

[MaggotChild]

I don't see a way to create a single URL in a collection and then have
routing dispatch to the appropriate method based on the  HTTP method.

map.resources :packages, :collection={ :search=:get }

Gets me half way there, but I can see a way to say that I want the
POST to go to the do_search method.

Furthermore

map.resources :packages, :collection=
{ :search=:get, :do_search=:post }

results in a ActionController::MethodNotAllowed for POSTs to /packages/
do_search.

`rake routes`  affirms that this should be accepted:

do_search_packages POST   /packages/do_search
{:action=do_search, :controller=packages}

How can I solve either of these?
Thanks


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[Rails] Re: Route Collections and HTTP methods

[MaggotChild]

 ..but in general searches are GET and
 never POST. I don't know where this nonsense comes from but
 it's breaking the principles behind the HTTP.

Well I don't disagree with this paradigm, but the point is Rails seems
to not allow one to set up a route  like the defaults provided by
map.resourses. i.e one URL, dispatched to to 2 different actions based
on HTTP method.

 Did you try :any instead of :post ?

Either one raises the nonsensical ActionController::MethodNotAllowed.
I say nonsensical because rake routes tells me do_search accepts
posts.


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[Rails] url_for, routes, and the current url

[MaggotChild]

I need to generate 2 types of URL  and have defined my routes as:

map.country_yes
  /:country/
yes, :controller=posts, :action=country, :yes=true
map.country_no
  /:country/
no, :controller=posts, :action=country, :yes=false

map.yes /yes, :controller=posts, :action=index, :yes=true
map.no /no, :controller=posts, :action=index, :yes=false

The problem is that, when a request if for /yes or /no, url_for()
doesn't generate URLs for the country.

url_for(:yes=true) generates the correct url no matter where its
used.
if the current request is for /no it generates /yes.
if its for /mexico/no, it generates /mexico/yes

though this is not the same when trying to generate URLs for country.
If the request is at /no
url_for(:country='usa',:yes=true) generates /no and tacks on 'usa'
and 'yes' as query string parameters instead of generating /usa/yes.


Why is this taking place?

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