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module Morpheus
module Associations
class HasOneAssociation < Association
# The initializer calls out to the superclass' initializer and then
# sets the options particular to itself.
def initialize(owner, association, settings = {})
super
# The foreign key is used to generate the url for the association
# request when the association is transformed into a relation.
# The default is to use the class of the owner object with an '_id'
# suffix.
@options[:foreign_key] ||= "#{@owner.class.to_s.underscore}_id".to_sym
# The primary key is used in the generated url for the target. It
# defaults to :id.
@options[:primary_key] ||= :id
# @association_class stores the class of the association, constantized
# from the named association (i.e. Automobile, Car, CarClub)
if @options[:class_name]
@association_class = @options[:class_name].constantize
else
@association_class = @association
end
end
def with_filter(filter)
HasOneAssociation.new(@owner, @association, :target => @target, :filters => @filters.dup.push(filter), :options => @options)
end
# When loading the target, the primary key is first checked. If the
# key is nil, then an nil is returned. Otherwise, the target
# is requested at the generated url. For a has_one :meeting
# association on a class called Course, the generated url might look
# like this: /meetings?course_id=1, where the 1 is the primary key.
def load_target!
if primary_key = @owner.send(@options[:primary_key])
Relation.new(@association_class.to_s.classify.constantize).where(@options[:foreign_key] => primary_key).limit(1).first
end
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems