On 14 Feb 2009, at 11:33, tonypm wrote:
Hi,
I am increasingly needing to do some more complex finds involving
several table associations. I can usually find an SQL solution, but
find it hard to think these out using ActiveRecord find techniques. I
guess I am thinking in SQL terms, when
tonypm wrote:
Repair has_many :notes
SELECT * FROM repairs
where exists
(select * from notes where repairs.id=notes.repair_id
and and notes.flagged)
r = Repair.find(...)
notes = r.notes.find_by_flagged(true)
I can't think of a way to learn how deep the ActiveRecord DSL
Frederick Cheung wrote:
Repair has_many :notes
SELECT * FROM repairs
where exists
(select * from notes where repairs.id=notes.repair_id
and and notes.flagged)
I forgot my basic SQL! I think that's just
SELECT * FROM repairs r, notes n
WHERE r.id = n.repair_id
AND
Just to finish the story.
Sorry - the distinct in the select is needed, I missed it out.
Going a step further, I now have:
named_scope :flagged_repairs, :select = 'distinct repairs.*', :joins
= :repair_notes, :conditions = [notes.flagged = ?, true]
So in my search, where I am building a
Fred,
Repair.find :all, :select = 'distinct repairs.*', :joins
= :notes, :conditions = [flagged = ?, true]
nice - many thanks. just needed to fix notes.flagged
--
In reality I have a generic notes model, so my usage is slightly more
complex:
In Repair I
named scope is definitely the way to go. check out
http://guides.rubyonrails.org/active_record_querying.html#_named_scopes
for more options (especialy named scope with argument)
On 14 Ún, 13:32, tonypm tonypmar...@hotmail.com wrote:
Just to finish the story.
Sorry - the distinct in the
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