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Add cop Rails/AcceptsNestedAttributesForUpdateOnly
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‎CHANGELOG.md

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## master (unreleased)
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* [#1035](https://github.com/rubocop/rubocop-rails/pull/1035): Add cop Rails/AcceptsNestedAttributesForUpdateOnly. ([@olivier-thatch][])
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## 2.21.2 (2023-09-30)
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### Bug fixes
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[@nipe0324]: https://github.com/nipe0324
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[@marocchino]: https://github.com/marocchino
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[@jamiemccarthy]: https://github.com/jamiemccarthy
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[@olivier-thatch]: https://github.com/olivier-thatch

‎config/default.yml

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Enabled: true
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DocumentationBaseURL: https://docs.rubocop.org/rubocop-rails
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Rails/AcceptsNestedAttributesForUpdateOnly:
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Description: 'Define the update_only option to the accepts_nested_attributes_for attributes writers.'
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StyleGuide: 'https://rails.rubystyle.guide#accepts_nested_attributes_for-update_only-option'
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Enabled: false
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VersionAdded: '2.21'
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Include:
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- app/models/**/*.rb
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Rails/ActionControllerFlashBeforeRender:
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Description: 'Use `flash.now` instead of `flash` before `render`.'
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Enabled: 'pending'

‎docs/modules/ROOT/pages/cops.adoc

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=== Department xref:cops_rails.adoc[Rails]
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* xref:cops_rails.adoc#railsacceptsnestedattributesforupdateonly[Rails/AcceptsNestedAttributesForUpdateOnly]
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* xref:cops_rails.adoc#railsactioncontrollerflashbeforerender[Rails/ActionControllerFlashBeforeRender]
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* xref:cops_rails.adoc#railsactioncontrollertestcase[Rails/ActionControllerTestCase]
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* xref:cops_rails.adoc#railsactionfilter[Rails/ActionFilter]

‎docs/modules/ROOT/pages/cops_rails.adoc

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= Rails
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== Rails/AcceptsNestedAttributesForUpdateOnly
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|===
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| Enabled by default | Safe | Supports autocorrection | Version Added | Version Changed
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| Disabled
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| Yes
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| No
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| 2.21
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| -
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|===
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Looks for `accepts_nested_attributes_for` attributes writers that don't
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specify an `:update_only` option.
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=== Examples
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[source,ruby]
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----
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# bad
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class Member < ActiveRecord::Base
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has_one :avatar
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accepts_nested_attributes_for :avatar
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end
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# good
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class Member < ActiveRecord::Base
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has_one :avatar
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accepts_nested_attributes_for :avatar, update_only: true
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end
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----
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=== Configurable attributes
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|===
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| Name | Default value | Configurable values
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| Include
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| `+app/models/**/*.rb+`
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| Array
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|===
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=== References
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* https://rails.rubystyle.guide#accepts_nested_attributes_for-update_only-option
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== Rails/ActionControllerFlashBeforeRender
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|===

‎lib/rubocop/cop/rails/accepts_nested_attributes_for_update_only.rb

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# frozen_string_literal: true
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module RuboCop
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module Cop
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module Rails
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# Looks for `accepts_nested_attributes_for` attributes writers that don't
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# specify an `:update_only` option.
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#
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# @example
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# # bad
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# class Member < ActiveRecord::Base
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# has_one :avatar
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# accepts_nested_attributes_for :avatar
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# end
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#
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# # good
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# class Member < ActiveRecord::Base
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# has_one :avatar
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# accepts_nested_attributes_for :avatar, update_only: true
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# end
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class AcceptsNestedAttributesForUpdateOnly < Base
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MSG = 'Specify a `:update_only` option.'
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RESTRICT_ON_SEND = %i[accepts_nested_attributes_for].freeze
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def_node_search :active_resource_class?, <<~PATTERN
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(const (const {nil? cbase} :ActiveResource) :Base)
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PATTERN
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def_node_matcher :accepts_nested_attributes_for_without_options?, <<~PATTERN
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(send _ {:accepts_nested_attributes_for} _)
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PATTERN
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def_node_matcher :accepts_nested_attributes_for_with_options?, <<~PATTERN
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(send _ {:accepts_nested_attributes_for} ... (hash $...))
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PATTERN
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def_node_matcher :update_only_option?, <<~PATTERN
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(pair (sym :update_only) {!nil (nil)})
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PATTERN
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def_node_matcher :with_options_block, <<~PATTERN
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(block
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(send nil? :with_options
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(hash $...))
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(args) ...)
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PATTERN
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def_node_matcher :accepts_nested_attributes_for_extension_block?, <<~PATTERN
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(block
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(send nil? :accepts_nested_attributes_for _)
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(args) ...)
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PATTERN
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def on_send(node)
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return if active_resource?(node.parent)
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return if !accepts_nested_attributes_for_without_options?(node) && \
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valid_options?(accepts_nested_attributes_for_with_options?(node))
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return if valid_options_in_with_options_block?(node)
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add_offense(node.loc.selector)
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end
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private
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def valid_options_in_with_options_block?(node)
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return true unless node.parent
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n = node.parent.begin_type?
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n ||= accepts_nested_attributes_for_extension_block?(node.parent) ? node.parent.parent : node.parent
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contain_valid_options_in_with_options_block?(n)
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end
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def contain_valid_options_in_with_options_block?(node)
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if (options = with_options_block(node))
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return true if valid_options?(options)
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return false unless node.parent
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return true if contain_valid_options_in_with_options_block?(node.parent.parent)
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end
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false
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end
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def valid_options?(options)
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return false if options.nil?
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options = extract_option_if_kwsplat(options)
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return true unless options
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return true if options.any? do |o|
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update_only_option?(o)
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end
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false
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end
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def extract_option_if_kwsplat(options)
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if options.first.kwsplat_type? && options.first.children.first.hash_type?
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return options.first.children.first.pairs
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end
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options
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end
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def active_resource?(node)
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return false if node.nil?
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active_resource_class?(node)
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end
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end
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end
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end
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end

‎lib/rubocop/cop/rails_cops.rb

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require_relative 'mixin/migrations_helper'
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require_relative 'mixin/target_rails_version'
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require_relative 'rails/accepts_nested_attributes_for_update_only'
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require_relative 'rails/action_controller_flash_before_render'
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require_relative 'rails/action_controller_test_case'
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require_relative 'rails/action_filter'

‎spec/rubocop/cop/rails/accepts_nested_attributes_for_update_only_spec.rb

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# frozen_string_literal: true
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RSpec.describe RuboCop::Cop::Rails::AcceptsNestedAttributesForUpdateOnly, :config do
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context 'accepts_nested_attributes_for' do
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it 'registers an offense when not specifying any options' do
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expect_offense(<<~RUBY)
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class Member < ApplicationRecord
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has_one :avatar
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accepts_nested_attributes_for :avatar
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Specify a `:update_only` option.
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end
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RUBY
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end
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it 'registers an offense when missing an explicit `:update_only` flag' do
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expect_offense(<<~RUBY)
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class Member < ApplicationRecord
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has_one :avatar
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accepts_nested_attributes_for :avatar, reject_if: :all_blank
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Specify a `:update_only` option.
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end
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RUBY
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end
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it 'does not register an offense when specifying `:update_only` flag' do
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expect_no_offenses(<<~RUBY)
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class Member < ApplicationRecord
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has_one :avatar
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accepts_nested_attributes_for :avatar, update_only: true
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end
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RUBY
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end
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it 'does not register an offense when specifying `:update_only` flag with double splat' do
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expect_no_offenses(<<~RUBY)
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class Member < ApplicationRecord
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has_one :avatar
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accepts_nested_attributes_for :avatar, **{update_only: true}
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end
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RUBY
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end
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it 'registers an offense when a variable passed with double splat' do
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expect_offense(<<~RUBY)
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class Member < ApplicationRecord
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has_one :avatar
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accepts_nested_attributes_for :avatar, **bar
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Specify a `:update_only` option.
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end
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RUBY
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end
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context 'with_options update_only: true' do
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it 'does not register an offense' do
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expect_no_offenses(<<~RUBY)
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class Member < ApplicationRecord
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has_one :avatar
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with_options update_only: true do
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accepts_nested_attributes_for :avatar
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end
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end
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RUBY
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end
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it 'does not register an offense for using `reject_if` option' do
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expect_no_offenses(<<~RUBY)
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class Member < ApplicationRecord
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has_one :avatar
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with_options update_only: true do
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accepts_nested_attributes_for :avatar, reject_if: :all_blank
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end
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end
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RUBY
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end
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end
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end
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context 'when an Active Record model does not have any associations' do
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it 'does not register an offense' do
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expect_no_offenses(<<~RUBY)
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class Member < ApplicationRecord
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end
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RUBY
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end
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end
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end

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