Class: Morpheus::Mixins::Associations::BelongsToAssociation

Inherits:
Association
  • Object
show all
Defined in:
lib/morpheus/mixins/associations/belongs_to_association.rb

Instance Method Summary collapse

Methods inherited from Association

#id, #includes, #nil?, #to_param, #try

Constructor Details

#initialize(owner, association, settings = {}) ⇒ BelongsToAssociation

The initializer calls out to the superclass’ initializer, then will set the options particular to itself.



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# File 'lib/morpheus/mixins/associations/belongs_to_association.rb', line 8

def initialize(owner, association, settings = {})
  super

  # The foreign key is used to generate the url for a request. The default uses
  # the association name with an '_id' suffix as the generated key. For example,
  # belongs_to :school, will have the foreign key :school_id.
  @options[:foreign_key] ||= "#{@association.to_s}_id".to_sym

  # The primary key defaults to :id.
  @options[:primary_key] ||= :id

  # Associations can be marked as polymorphic. These associations will use
  # the returned type to instantiate the associated object.
  @options[:polymorphic] = settings[:options][:polymorphic] || false

  # @association_class stores the class of the association, constantized
  # from the named association (i.e. Automobile, Car, CarClub)
  @association_class = @options[:class_name].constantize
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Morpheus::Mixins::Associations::Association

Instance Method Details

#load_target! ⇒ Object

When loading the target, the association will only be loaded if the foreign_key has been set. Additionally, the class used to find the record will be inferred by calling the method which is the name of the association with a ‘_type’ suffix. Alternatively, the class name can be set by using the :class_name option.



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# File 'lib/morpheus/mixins/associations/belongs_to_association.rb', line 36

def load_target!
  if association_id = @owner.send(@options[:foreign_key])
    polymorphic_class = @options[:polymorphic] ? @owner.send("#{@association}_type".to_sym).constantize : @options[:class_name].constantize
    attributes = [UrlBuilder.belongs_to(polymorphic_class, association_id), nil, { :id => association_id }]
    polymorphic_class.find(association_id)
  end
end

#with_filter(filter) ⇒ Object 



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# File 'lib/morpheus/mixins/associations/belongs_to_association.rb', line 28

def with_filter(filter)
  BelongsToAssociation.new(@owner, @association, :target => @target, :filters => @filters.dup.push(filter), :options => @options)
end