Simple. You return an array from initialized_interactions.That's why.
--
Dheeraj Kumar
On Sunday 24 March 2013 at 5:50 PM, jle...@socit.co.uk wrote:
> Hi all, I am trying to reproduce rails 3.2 behaviour with fields_for and
> nested attributes.
>
> class ControllerAction < ActiveRecord::Base
> has_many :interactions, dependent: :destroy
> has_many :roles, through: :interactions
>
> scope :controllers, lambda {|name| where("controller_name_id = ?",
> name)}
> scope :actions, lambda {|name| where("action_name_id = ?", name)}
>
> def initialized_interactions() # this is the key method
> [].tap do |o|
> Role.all.each do |r|
> if p = interactions.find { |p| p.role_id == r.id }
> o << p.tap { |p| p.enable ||= true }
> else
> o << Interaction.new(:role_id => r.id)
> end
> end
> end
> end
> end
>
> class Role < ActiveRecord::Base
> has_many :interactions
> end
>
> class Interaction < ActiveRecord::Base
> belongs_to :controller_action
> belongs_to :role
> attr_accessor :enable # nice little thingy here
> # It is now recommended to use strong params instead of
> 'attr_accessible :enable, :controller_action_id, :role_id'
> end
>
> controller_actions_controller.rb
> ...
> private
> # Use callbacks to share common setup or constraints between actions.
> def set_controller_action
> @controller_action = ControllerAction.find(params[:id])
> end
>
> # Never trust parameters from the scary internet, only allow the
> white list through.
> def controller_action_params
> params.require(:controller_action).permit!
> end
>
> controller_actions view - excluding error code and most css formatting.
> _form.rb
>
> <%= form_for(@controller_action) do |f| %>
> ...
> <%= f.label :name %><br />
> <%= f.text_field :name %>
>
> <h2><%= f.label :role %></h2>
> <%= f.fields_for :interactions,
> @controller_action.initialized_interactions() do |builder| %>
> <% role = builder.object.role %>
> <%= builder.hidden_field :role_id %>
>
> <%= builder.check_box :enable %>
> <%= builder.label :enable, role.name (http://role.name) %>
>
> <% end %>
>
> <%= f.submit %>
>
> <% end %>
>
> Under rails 3.2.11 I get a form that allows the user to edit roles.
> Editing controller_action
> Name
> Roles
> Webmaster
> Admin
> Moderator
> Editor
> Registered User
> Guest
>
>
>
> Show (http://localhost:3200/controller_actions/1) | Back
> (http://localhost:3200/controller_actions)
>
> Under Rails 4.0 you get:-
> undefined method `role' for #<Array:0xb875d4c>
> Extracted source (around line #21):
>
> 18 19 20 21 22 23 24
>
> <div>
> <h2><%= f.label :role %></h2>
> <%= f.fields_for :interactions, @controller_action.initialized_interactions()
> do |builder| %>
> <% role = builder.object.role %>
> <%= builder.hidden_field :role_id %>
>
> <div class="field">
>
>
>
>
>
>
>
> Trace of template inclusion: app/views/controller_actions/edit.html.erb
> Rails.root: /home/john/RubyMineProjects/Rails/4.0/urps2
> Application Trace (http://localhost:3100/controller_actions/1/edit#) |
> Framework Trace (http://localhost:3100/controller_actions/1/edit#) | Full
> Trace (http://localhost:3100/controller_actions/1/edit#)
> app/views/controller_actions/_form.html.erb:21:in `block (2 levels) in
> _app_views_controller_actions__form_html_erb__366592963_95670400' actionpack
> (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in `block in
> capture' actionpack (4.0.0.beta1)
> lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer'
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
> `capture' actionpack (4.0.0.beta1)
> lib/action_view/helpers/form_helper.rb:707:in `fields_for' actionpack
> (4.0.0.beta1) lib/action_view/helpers/form_helper.rb:1501:in `fields_for'
> app/views/controller_actions/_form.html.erb:20:in `block in
> _app_views_controller_actions__form_html_erb__366592963_95670400' actionpack
> (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in `block in
> capture' actionpack (4.0.0.beta1)
> lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer'
> actionpack (4.0.0.beta1) lib/action_view/helpers/capture_helper.rb:38:in
> `capture' actionpack (4.0.0.beta1)
lib/action_view/helpers/form_helper.rb:435:in `form_for'
app/views/controller_actions/_form.html.erb:1:in
`_app_views_controller_actions__form_html_erb__366592963_95670400' actionpack
(4.0.0.beta1) lib/action_view/template.rb:143:in `block in render'
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:160:in
`instrument' actionpack (4.0.0.beta1) lib/action_view/template.rb:141:in
`render' actionpack (4.0.0.beta1)
lib/action_view/renderer/partial_renderer.rb:306:in `render_partial' actionpack
(4.0.0.beta1) lib/action_view/renderer/partial_renderer.rb:279:in `block in
render' actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `block in instrument'
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in `block
in instrument' activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument' actionpack (4.0.0.beta1) lib/act
ion_view/renderer/abstract_renderer.rb:23:in `instrument' actionpack
(4.0.0.beta1) lib/action_view/renderer/partial_renderer.rb:278:in `render'
actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:41:in
`render_partial' actionpack (4.0.0.beta1)
lib/action_view/helpers/rendering_helper.rb:27:in `render'
app/views/controller_actions/edit.html.erb:3:in
`_app_views_controller_actions_edit_html_erb__785330494_92185850' actionpack
(4.0.0.beta1) lib/action_view/template.rb:143:in `block in render'
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:160:in
`instrument' actionpack (4.0.0.beta1) lib/action_view/template.rb:141:in
`render' actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:49:in `block (2 levels) in
render_template' actionpack (4.0.0.beta1)
lib/action_view/renderer/abstract_renderer.rb:23:in `block in instrument'
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in `block
in instrument' activesupport (4.0.0.beta1) lib/a
ctive_support/notifications/instrumenter.rb:20:in `instrument' activesupport
(4.0.0.beta1) lib/active_support/notifications.rb:158:in `instrument'
actionpack (4.0.0.beta1) lib/action_view/renderer/abstract_renderer.rb:23:in
`instrument' actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:48:in `block in render_template'
actionpack (4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:56:in
`render_with_layout' actionpack (4.0.0.beta1)
lib/action_view/renderer/template_renderer.rb:47:in `render_template'
actionpack (4.0.0.beta1) lib/action_view/renderer/template_renderer.rb:17:in
`render' actionpack (4.0.0.beta1) lib/action_view/renderer/renderer.rb:36:in
`render_template' actionpack (4.0.0.beta1)
lib/action_view/renderer/renderer.rb:17:in `render' actionpack (4.0.0.beta1)
lib/abstract_controller/rendering.rb:119:in `_render_template' actionpack
(4.0.0.beta1) lib/action_controller/metal/streaming.rb:219:in
`_render_template' actionpack (4.0.0.beta1) lib/abstra
ct_controller/rendering.rb:112:in `render_to_body' actionpack (4.0.0.beta1)
lib/action_controller/metal/rendering.rb:33:in `render_to_body' actionpack
(4.0.0.beta1) lib/action_controller/metal/renderers.rb:26:in `render_to_body'
actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:97:in `render'
actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:16:in
`render' actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in
render' activesupport (4.0.0.beta1)
lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/home/john/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/benchmark.rb:296:in
`realtime' activesupport (4.0.0.beta1)
lib/active_support/core_ext/benchmark.rb:5:in `ms' actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:41:in `block in render'
actionpack (4.0.0.beta1) lib/action_controller/metal/instrumentation.rb:84:in
`cleanup_view_runtime' activerecord (4.0.0.beta1) lib/active_record/railties/con
troller_runtime.rb:24:in `cleanup_view_runtime' actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:40:in `render' actionpack
(4.0.0.beta1) lib/action_controller/metal/implicit_render.rb:10:in
`default_render' actionpack (4.0.0.beta1)
lib/action_controller/metal/implicit_render.rb:5:in `send_action' actionpack
(4.0.0.beta1) lib/abstract_controller/base.rb:189:in `process_action'
actionpack (4.0.0.beta1) lib/action_controller/metal/rendering.rb:10:in
`process_action' actionpack (4.0.0.beta1)
lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:413:in
`_run__68927184__process_action__callbacks' activesupport (4.0.0.beta1)
lib/active_support/callbacks.rb:78:in `run_callbacks' actionpack (4.0.0.beta1)
lib/abstract_controller/callbacks.rb:17:in `process_action' actionpack
(4.0.0.beta1) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.0.0.beta1) lib/action_controller/me
tal/instrumentation.rb:31:in `block in process_action' activesupport
(4.0.0.beta1) lib/active_support/notifications.rb:158:in `block in instrument'
activesupport (4.0.0.beta1)
lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.0.0.beta1) lib/active_support/notifications.rb:158:in
`instrument' actionpack (4.0.0.beta1)
lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.0.0.beta1) lib/action_controller/metal/params_wrapper.rb:245:in
`process_action' activerecord (4.0.0.beta1)
lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.0.0.beta1) lib/abstract_controller/base.rb:136:in `process'
actionpack (4.0.0.beta1) lib/abstract_controller/rendering.rb:44:in `process'
actionpack (4.0.0.beta1) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.0.0.beta1) lib/action_controller/metal/rack_delegation.rb:13:in
`dispatch' actionpack (4.0.0.beta1) lib/action_controller/metal.rb:232:in `bl
ock in action' actionpack (4.0.0.beta1)
lib/action_dispatch/routing/route_set.rb:78:in `call' actionpack (4.0.0.beta1)
lib/action_dispatch/routing/route_set.rb:78:in `dispatch' actionpack
(4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:46:in `call' actionpack
(4.0.0.beta1) lib/action_dispatch/journey/router.rb:69:in `block in call'
actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in `each'
actionpack (4.0.0.beta1) lib/action_dispatch/journey/router.rb:57:in `call'
actionpack (4.0.0.beta1) lib/action_dispatch/routing/route_set.rb:651:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call' rack (1.5.2)
lib/rack/conditionalget.rb:25:in `call' rack (1.5.2) lib/rack/head.rb:11:in
`call' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/params_parser.rb:27:in `call' actionpack
(4.0.0.beta1) lib/action_dispatch/middleware/flash.rb:241:in `call' rack
(1.5.2) lib/rack/session/abstract/id.rb:225:in `context' rack (1.5.2)
lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.0.0.beta1) lib/action_dispatch/middleware/cookies.rb:452:in
`call' activerecord (4.0.0.beta1) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.0.0.beta1)
lib/active_record/connection_adapters/abstract/connection_pool.rb:632:in `call'
activerecord (4.0.0.beta1) lib/active_record/migration.rb:348:in `call'
actionpack (4.0.0.beta1) lib/action_dispatch/middleware/callbacks.rb:29:in
`block in call' activesupport (4.0.0.beta1)
lib/active_support/callbacks.rb:373:in `_run__125207171__call__callbacks'
activesupport (4.0.0.beta1) lib/active_support/callbacks.rb:78:in
`run_callbacks' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack
(4.0.0.beta1) lib/action_dispatch/middleware/reloader.rb:64:in `call'
actionpack (4.0.0.beta1) lib/action_dispatch/middleware/remote_ip.rb:76:in
`call' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' actionpack
(4.0.0.beta1) lib/action_dispatch/middleware/
show_exceptions.rb:30:in `call' railties (4.0.0.beta1)
lib/rails/rack/logger.rb:38:in `call_app' railties (4.0.0.beta1)
lib/rails/rack/logger.rb:21:in `block in call' activesupport (4.0.0.beta1)
lib/active_support/tagged_logging.rb:67:in `block in tagged' activesupport
(4.0.0.beta1) lib/active_support/tagged_logging.rb:25:in `tagged' activesupport
(4.0.0.beta1) lib/active_support/tagged_logging.rb:67:in `tagged' railties
(4.0.0.beta1) lib/rails/rack/logger.rb:21:in `call' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/request_id.rb:21:in `call' rack (1.5.2)
lib/rack/methodoverride.rb:21:in `call' rack (1.5.2) lib/rack/runtime.rb:17:in
`call' activesupport (4.0.0.beta1)
lib/active_support/cache/strategy/local_cache.rb:72:in `call' rack (1.5.2)
lib/rack/lock.rb:17:in `call' actionpack (4.0.0.beta1)
lib/action_dispatch/middleware/static.rb:64:in `call' railties (4.0.0.beta1)
lib/rails/engine.rb:510:in `call' railties (4.0.0.beta1)
lib/rails/application.rb:96:in `call' railties
(4.0.0.beta1) lib/rails/railtie/configurable.rb:30:in `method_missing' unicorn
(4.6.2) lib/unicorn/http_server.rb:552:in `process_client' unicorn (4.6.2)
lib/unicorn/http_server.rb:632:in `worker_loop' unicorn (4.6.2)
lib/unicorn/http_server.rb:500:in `spawn_missing_workers' unicorn (4.6.2)
lib/unicorn/http_server.rb:511:in `maintain_worker_count' unicorn (4.6.2)
lib/unicorn/http_server.rb:277:in `join' unicorn (4.6.2)
bin/unicorn_rails:209:in `<top (required)>'
/home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in `load'
/home/john/.rvm/gems/ruby-2.0.0-p0@rails-4/bin/unicorn_rails:23:in `<top
(required)>' ruby-debug-ide (0.4.17.beta16) lib/ruby-debug-ide.rb:86:in
`debug_load' ruby-debug-ide (0.4.17.beta16) lib/ruby-debug-ide.rb:86:in
`debug_program' ruby-debug-ide (0.4.17.beta16) bin/rdebug-ide:109:in `<top
(required)>' -e:1:in `load' -e:1:in `<main>'
>
>
> Request
> Parameters:
> {"id"=>"1"}
> Toggle session dump (http://localhost:3100/controller_actions/1/edit#)
>
> Toggle env dump (http://localhost:3100/controller_actions/1/edit#)
>
> Response
> Headers:
> None
>
> Sorry about the verbosity but I am really struggling to solve this most basic
> use case.
>
> I have tried to figure out why the form builder returns an array but and
> would write my own if I could figure out how to.
>
> Any help appreciated.
> --
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