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Contents
module ActiveZuora
module BelongsToAssociations
extend ActiveSupport::Concern
module ClassMethods
def belongs_to(item, options={})
class_name = options[:class_name] || nested_class_name(item.to_s.camelize)
foreign_key = options[:foreign_key] || :"#{item}_id"
# Add the field if it doesn't already exist.
field foreign_key, :string unless field? foreign_key
ivar = "@#{item}"
loaded_ivar = "@#{item}_loaded"
# Define the methods on an included module, so we can override
# them using super.
generated_attribute_methods.module_eval do
define_method(item) do
# Return the object if it was already loaded.
if instance_variable_get(loaded_ivar)
return instance_variable_get(ivar)
else
# Otherwise find it.
record = class_name.constantize.find self.send(foreign_key)
send("#{item}=", record)
record
end
end
define_method("#{item}=") do |record|
instance_variable_set(loaded_ivar, true)
instance_variable_set(ivar, record)
# Set the foreign key id attribute as well.
write_attribute(foreign_key, record.try(:id))
record
end
redefine_method("#{foreign_key}=") do |item_id|
item_id = write_attribute(foreign_key, item_id)
# Unload the object if the id is different.
if send("#{item}_loaded?") && send(item).id != item_id
instance_variable_set(loaded_ivar, false)
end
item_id
end
define_method("#{item}_loaded?") do
instance_variable_get(loaded_ivar) || false
end
define_method("reload_#{item}") do
instance_variable_set(loaded_ivar, false)
send(item)
end
end
end
end
end
end
Version data entries
30 entries across 30 versions & 1 rubygems