Class: Sequel::Model::Associations::AssociationReflection

Inherits:
Hash
  • Object
show all
Defined in:
lib/sequel_model/association_reflection.rb

Overview

AssociationReflection is a Hash subclass that keeps information on Sequel::Model associations. It provides a few methods to reduce the amount of internal code duplication. It should not be instantiated by the user.

Constant Summary collapse

RECIPROCAL_ASSOCIATIONS = 
{:many_to_one=>:one_to_many, :one_to_many=>:many_to_one, :many_to_many=>:many_to_many}

Instance Method Summary collapse

Instance Method Details

#associated_class ⇒ Object

The class associated to the current model class via this association



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# File 'lib/sequel_model/association_reflection.rb', line 11

def associated_class
  self[:class] ||= self[:class_name].constantize
end

#associated_primary_key ⇒ Object

The associated class’s primary key (used for caching)



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# File 'lib/sequel_model/association_reflection.rb', line 16

def associated_primary_key
 self[:associated_primary_key] ||= associated_class.primary_key
end

#reciprocal ⇒ Object

Returns/sets the reciprocal association variable, if one exists



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# File 'lib/sequel_model/association_reflection.rb', line 21

def reciprocal
  return self[:reciprocal] if include?(:reciprocal)
  reciprocal_type = RECIPROCAL_ASSOCIATIONS[self[:type]]
  if reciprocal_type == :many_to_many
    left_key = self[:left_key]
    right_key = self[:right_key]
    join_table = self[:join_table]
    associated_class.all_association_reflections.each do |assoc_reflect|
      if assoc_reflect[:type] == :many_to_many && assoc_reflect[:left_key] == right_key \
         && assoc_reflect[:right_key] == left_key && assoc_reflect[:join_table] == join_table
        return self[:reciprocal] = assoc_reflect[:name]
      end
    end
  else
    key = self[:key]
    associated_class.all_association_reflections.each do |assoc_reflect|
      if assoc_reflect[:type] == reciprocal_type && assoc_reflect[:key] == key
        return self[:reciprocal] = assoc_reflect[:name]
      end
    end
  end
  self[:reciprocal] = nil
end

#select ⇒ Object

The columns to select when loading the association



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# File 'lib/sequel_model/association_reflection.rb', line 46

def select
 self[:select] ||= associated_class.table_name.*
end