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POhow to extend belong_to functionality in rails
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Id
18362000
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18643565
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2
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5
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2013-08-21T15:45:23.707
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1
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2013-09-05T18:41:27.843
LastEditDate
2017-05-23T11:44:27.080
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-1
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473040
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0
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1
Score
4
ViewCount
592
LastEditorDisplayName
text
Body
I'm building a gem and I want part of its functionality to extend <code>ActiveRecord::Associations::Builder::BelongsTo</code> but I cannot figure out how to do it so basically user should be able to specify: <pre><code>class Event < ActiveRecord::Base belongs_to :users, foo: true end </code></pre> anyone know how to do it ?? This wont work: <pre><code>module Mygem module BelongsToFoo def valid_options super + [:foo] end #... other functionality end end class ActiveRecord::Associations::Builder::BelongsTo extend MyGem::BelongsToFoo end </code></pre> console <pre><code>ActiveRecord::Associations::Builder::BelongsTo.valid_options.include? :foo #=> false ... :( Event ArgumentError: Unknown key: foo </code></pre> <a href="https://github.com/rails/rails/blob/b5c4274a34d6815415111369d09e6249ccf588f1/activerecord/lib/active_record/associations/builder/belongs_to.rb" rel="nofollow noreferrer">belongs_to source code </a> ============================================================================= Update flowing <a href="https://stackoverflow.com/a/18362678/473040">delwyns answer</a> I tried to have a another look on my code and he is right it should be included however <code>ActiveRecord::Associations::Builder::BelongsTo</code> has a variable <code>valid_options</code> as well. so I can do <pre><code>ActiveRecord::Associations::Builder::BelongsTo.new(:a, :b, :c).valid_options.include? :foo # => true </code></pre> but also <pre><code>ActiveRecord::Associations::Builder::BelongsTo.valid_options.include? :foo # => true </code></pre> so it should really look like this <pre><code>module MyGem module BelongsToFoo extend ActiveSupport::Concern included do self.valid_options += [:foo] end def valid_options super + [:foo] end def define_callbacks(model, reflection) # this wont get executed add_foo_callbacks(model, reflection)# if options[:foo] super end def add_foo_callbacks(model, reflection) # therefore this wont either end end end </code></pre> Even if I try this <pre><code>module MyGem module BelongsToFoo def define_callbacks(model, reflection) raise "dobugging" end end end </code></pre> nothing will happen, Rails completely ignore my method override So yes I can define my own option, however they do nothing :( any suggestions ? 
Tags
<ruby-on-rails><ruby-on-rails-3><activerecord>
Title
how to extend belong_to functionality in rails
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