Module ActiveRecord::Reflection::ClassMethods
In: vendor/rails/activerecord/lib/active_record/reflection.rb

Reflection allows you to interrogate Active Record classes and objects about their associations and aggregations. This information can for example be used in a form builder that took an Active Record object and created input fields for all of the attributes depending on their type and displayed the associations to other objects.

You can find the interface for the AggregateReflection and AssociationReflection classes in the abstract MacroReflection class.

Methods

reflect_on_aggregation   reflect_on_all_aggregations   reflect_on_all_associations   reflect_on_association  

Public Instance methods

reflect_on_aggregation(aggregation)

Returns the AggregateReflection object for the named aggregation (use the symbol). Example: 

  Account.reflect_on_aggregation(:balance) # returns the balance AggregateReflection

[Source]

    # File vendor/rails/activerecord/lib/active_record/reflection.rb, line 50
50:       def reflect_on_aggregation(aggregation)
51:         reflect_on_all_aggregations.find { |reflection| reflection.name == aggregation } unless reflect_on_all_aggregations.nil?
52:       end
reflect_on_all_aggregations()

Returns an array of AggregateReflection objects for all the aggregations in the class.

[Source]

    # File vendor/rails/activerecord/lib/active_record/reflection.rb, line 44
44:       def reflect_on_all_aggregations
45:         read_inheritable_attribute(:aggregations) or write_inheritable_attribute(:aggregations, [])
46:       end
reflect_on_all_associations()

Returns an array of AssociationReflection objects for all the aggregations in the class.

[Source]

    # File vendor/rails/activerecord/lib/active_record/reflection.rb, line 55
55:       def reflect_on_all_associations
56:         read_inheritable_attribute(:associations) or write_inheritable_attribute(:associations, [])
57:       end
reflect_on_association(association)

Returns the AssociationReflection object for the named aggregation (use the symbol). Example: 

  Account.reflect_on_association(:owner) # returns the owner AssociationReflection

[Source]

    # File vendor/rails/activerecord/lib/active_record/reflection.rb, line 61
61:       def reflect_on_association(association)
62:         reflect_on_all_associations.find { |reflection| reflection.name == association }
63:       end

[Validate]