Suppose I have the following models:
Parent
(#has_many :children, but I don't want to expose this association
directly.)
Child
belongs_to :parent
has_one :lunchbox
Lunchbox
belongs_to :parent
belongs_to :child
I want to put a has_many in the parent to give me all the
children that do not have a Batman lunchbox (or who have
no lunchbox at all). Basically, in railsy pseudo code it
would be something in the parent model like:
list = []
for each of my children do |c|
if (c.lunchbox.nil?) || (c.lunchbox.batman == false)
list << c
end
end
return c
I'd like to put this in a has_many instead, but I'm stuck
on figuring out the :conditions and :include options that
I need to make the above happen.
I'm thinking there is some magic with hashes and/or arrays in
an :include option to the has_many declaration, but frankly I'm
pretty weak at this point regarding those complex :include
specs and how they play out, and so far have been unable to get
it working. I think the "all the children that do *not* have
a lunchbox" part is what's tripping me up.
Thanks for any pointers!
-glenn
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