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Add accepts_nested_attributes_for support for delegated_type #2

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Add accepts_nested_attributes_for support for delegated_type #2

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19 changes: 19 additions & 0 deletions lib/delegated_type.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -137,6 +137,21 @@ module ActiveRecord
# end
#
# Now you can list a bunch of entries, call +Entry#title+, and polymorphism will provide you with the answer.
#
# == Nested Attributes
#
# Enabling nested attributes on a delegated_type association allows you to
# create the entry and message in one go:
#
# class Entry < ApplicationRecord
# delegated_type :entryable, types: %w[ Message Comment ]
# accepts_nested_attributes_for :entryable
# end
#
# params = { entry: { entryable_type: 'Message', entryable_attributes: { subject: 'Smiling' } } }
# entry = Entry.create(params[:entry])
# entry.entryable.id # => 2
# entry.entryable.subject # => 'Smiling'
module DelegatedType
# Defines this as a class that'll delegate its type for the passed +role+ to the class references in +types+.
# That'll create a polymorphic +belongs_to+ relationship to that +role+, and it'll add all the delegated
Expand Down Expand Up @@ -186,6 +201,10 @@ def define_delegated_type_methods(role, types:)
public_send("#{role}_class").model_name.singular.inquiry
end

define_method "build_#{role}" do |*params|
public_send("#{role}=", public_send("#{role}_class").new(*params))
end

types.each do |type|
scope_name = type.tableize.gsub("/", "_")
singular = scope_name.singularize
Expand Down