Find all association methods

dubstep · January 17, 2012, 2:43pm

Hi all,

I want to get all association methods in one single model…

Any default method is provided by Active Record ???

i am using ruby 1.9.3 and rails 3.1.3

Please reply me …

Thanks,

kingston.s

Kingston.s · January 17, 2012, 2:51pm

On 17 January 2012 06:41, Kingston.s [email protected] wrote:

Hi all,

I want to get all association methods in one single model…

What do you mean “get” the methods?

Colin

kingston.s

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Kingston.s · January 17, 2012, 3:10pm

On Tue, Jan 17, 2012 at 7:41 AM, Kingston.s [email protected] wrote:

Hi all,

I want to get all association methods in one single model…

Any default method is provided by Active Record ???

i am using ruby 1.9.3 and rails 3.1.3

User.reflect_on_all_associations.map{|a| [a.macro,a.name]}

etc.

Peter

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Kingston.s · January 18, 2012, 5:50am

On Jan 17, 7:08pm, Peter V. [email protected] wrote:

etc.

Peter

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Hi Peter,

Thanks for quick reply…

This is working fine.but it is return all the association and the
corresponding model name…

like [:has_many, :site_users]

but i want association methods like site_user_ids and site_user_ids=

kingston.s

Kingston.s · January 18, 2012, 10:31am

On Wed, Jan 18, 2012 at 5:49 AM, Kingston.s [email protected] wrote:

User.reflect_on_all_associations.map{|a| [a.macro,a.name]}

Thanks for quick reply…

This is working fine.but it is return all the association and the
corresponding model name…

like [:has_many, :site_users]

but i want association methods like site_user_ids and site_user_ids=

Hmmm, I don’t see them in that datastructure. I presume they are defined
automatically, based on the name of the association, in this code
starting
at:

github.com

rails/rails/blob/main/activerecord/lib/active_record/associations/builder/collection_association.rb#L57


      
                ->(method, owner, record) { owner.send(callback, record) }
              when Proc
                ->(method, owner, record) { callback.call(owner, record) }
              else
                ->(method, owner, record) { callback.send(method, owner, record) }
              end
            end
            model.send "#{full_callback_name}=", callbacks
          end
          
          
# Defines the setter and getter methods for the collection_singular_ids.
          def self.define_readers(mixin, name)
            super
          
          
  mixin.class_eval <<-CODE, __FILE__, __LINE__ + 1
              def #{name.to_s.singularize}_ids
                association(:#{name}).ids_reader
              end
            CODE
          end

In general … I think it is better not to touch the _id fields manually
and
use other association methods (without _id) if possible. E.g. the
‘build’ or ‘delete’ functions on the has_many association.

HTH,

Peter