Class: ReactiveResource::Association::HasOneAssociation

Inherits:
Object
  • Object
show all
Defined in:
lib/reactive_resource/association/has_one_association.rb

Overview

Represents and resolves a has_one association

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass, attribute, options) ⇒ HasOneAssociation

Create a new has_one association.



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# File 'lib/reactive_resource/association/has_one_association.rb', line 53

def initialize(klass, attribute, options)
  @klass = klass
  @attribute = attribute
  @options = options

  add_helper_methods(klass, attribute)
end

Instance Attribute Details

#attribute ⇒ Object (readonly)

The attribute name this association represents



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# File 'lib/reactive_resource/association/has_one_association.rb', line 10

def attribute
  @attribute
end

#klass ⇒ Object (readonly)

The class this association is attached to



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# File 'lib/reactive_resource/association/has_one_association.rb', line 7

def klass
  @klass
end

#options ⇒ Object (readonly)

additional options passed in when the association was created



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# File 'lib/reactive_resource/association/has_one_association.rb', line 13

def options
  @options
end

Instance Method Details

#add_helper_methods(klass, attribute) ⇒ Object

Adds methods for has_one associations, to make dealing with these objects a bit more straightforward. If the attribute name is headshot, it will add:

headshot

returns the associated headshot



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# File 'lib/reactive_resource/association/has_one_association.rb', line 38

def add_helper_methods(klass, attribute)
  association = self
  klass.class_eval do 
    # lawyer.headshot
    define_method(attribute) do
      unless instance_variable_get("@#{attribute}")
        object = association.resolve_relationship(self)
        instance_variable_set("@#{attribute}", object)
      end
      instance_variable_get("@#{attribute}")
    end
  end
end

#associated_class ⇒ Object

Returns the class name of the target of the association. Based off of attribute unless class_name was passed in the options hash.



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# File 'lib/reactive_resource/association/has_one_association.rb', line 18

def associated_class
  if options[:class_name]
    options[:class_name].constantize
  else
    klass.relative_const_get(attribute.to_s.camelize)
  end
end

#resolve_relationship(object) ⇒ Object

Called when this assocation is referenced. Finds and returns the target of this association.



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# File 'lib/reactive_resource/association/has_one_association.rb', line 28

def resolve_relationship(object)
  id_attribute = "#{klass.name.split("::").last.underscore}_id"
  associated_class.find(:one, :params => object.prefix_options.merge(id_attribute => object.id))
end