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redundant_presence_validation_on_belongs_to.rb
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/
redundant_presence_validation_on_belongs_to.rb
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# frozen_string_literal: true
module RuboCop
module Cop
module Rails
# Since Rails 5.0 the default for `belongs_to` is `optional: false`
# unless `config.active_record.belongs_to_required_by_default` is
# explicitly set to `false`. The presence validator is added
# automatically, and explicit presence validation is redundant.
#
# @example
# # bad
# belongs_to :user
# validates :user, presence: true
#
# # bad
# belongs_to :user
# validates :user_id, presence: true
#
# # bad
# belongs_to :author, foreign_key: :user_id
# validates :user_id, presence: true
#
# # good
# belongs_to :user
#
# # good
# belongs_to :author, foreign_key: :user_id
#
class RedundantPresenceValidationOnBelongsTo < Base
include RangeHelp
extend AutoCorrector
extend TargetRailsVersion
MSG = 'Remove explicit presence validation for `%<association>s`.'
RESTRICT_ON_SEND = %i[validates].freeze
minimum_target_rails_version 5.0
# @!method presence_validation?(node)
# Match a `validates` statement with a presence check
#
# @example source that matches - by association
# validates :user, presence: true
#
# @example source that matches - with presence options
# validates :user, presence: { message: 'duplicate' }
#
# @example source that matches - by a foreign key
# validates :user_id, presence: true
def_node_matcher :presence_validation?, <<~PATTERN
$(
send nil? :validates
(sym $_)
...
$(hash <$(pair (sym :presence) {true hash}) ...>)
)
PATTERN
# @!method optional_option?(node)
# Match a `belongs_to` association with an optional option in a hash
def_node_matcher :optional?, <<~PATTERN
(send nil? :belongs_to _ ... #optional_option?)
PATTERN
# @!method optional_option?(node)
# Match an optional option in a hash
def_node_matcher :optional_option?, <<~PATTERN
{
(hash <(pair (sym :optional) true) ...>) # optional: true
(hash <(pair (sym :required) false) ...>) # required: false
}
PATTERN
# @!method any_belongs_to?(node, association:)
# Match a class with `belongs_to` with no regard to `foreign_key` option
#
# @example source that matches
# belongs_to :user
#
# @example source that matches - regardless of `foreign_key`
# belongs_to :author, foreign_key: :user_id
#
# @param node [RuboCop::AST::Node]
# @param association [Symbol]
# @return [Array<RuboCop::AST::Node>, nil] matching node
def_node_matcher :any_belongs_to?, <<~PATTERN
(begin
<
$(send nil? :belongs_to (sym %association) ...)
...
>
)
PATTERN
# @!method belongs_to?(node, key:, fk:)
# Match a class with a matching association, either by name or an explicit
# `foreign_key` option
#
# @example source that matches - fk matches `foreign_key` option
# belongs_to :author, foreign_key: :user_id
#
# @example source that matches - key matches association name
# belongs_to :user
#
# @example source that does not match - explicit `foreign_key` does not match
# belongs_to :user, foreign_key: :account_id
#
# @param node [RuboCop::AST::Node]
# @param key [Symbol] e.g. `:user`
# @param fk [Symbol] e.g. `:user_id`
# @return [Array<RuboCop::AST::Node>] matching nodes
def_node_matcher :belongs_to?, <<~PATTERN
(begin
<
${
#belongs_to_without_fk?(%key) # belongs_to :user
#belongs_to_with_a_matching_fk?(%fk) # belongs_to :author, foreign_key: :user_id
}
...
>
)
PATTERN
# @!method belongs_to_without_fk?(node, fk)
# Match a matching `belongs_to` association, without an explicit `foreign_key` option
#
# @param node [RuboCop::AST::Node]
# @param key [Symbol] e.g. `:user`
# @return [Array<RuboCop::AST::Node>] matching nodes
def_node_matcher :belongs_to_without_fk?, <<~PATTERN
{
(send nil? :belongs_to (sym %1)) # belongs_to :user
(send nil? :belongs_to (sym %1) !hash) # belongs_to :user, -> { not_deleted }
(send nil? :belongs_to (sym %1) !(hash <(pair (sym :foreign_key) _) ...>))
}
PATTERN
# @!method belongs_to_with_a_matching_fk?(node, fk)
# Match a matching `belongs_to` association with a matching explicit `foreign_key` option
#
# @example source that matches
# belongs_to :author, foreign_key: :user_id
#
# @param node [RuboCop::AST::Node]
# @param fk [Symbol] e.g. `:user_id`
# @return [Array<RuboCop::AST::Node>] matching nodes
def_node_matcher :belongs_to_with_a_matching_fk?, <<~PATTERN
(send nil? :belongs_to ... (hash <(pair (sym :foreign_key) (sym %1)) ...>))
PATTERN
def on_send(node)
validation, key, options, presence = presence_validation?(node)
return unless validation
belongs_to = belongs_to_for(node.parent, key)
return unless belongs_to
return if optional?(belongs_to)
message = format(MSG, association: key.to_s)
add_offense(presence, message: message) do |corrector|
remove_presence_validation(corrector, node, options, presence)
end
end
private
def belongs_to_for(model_class_node, key)
if key.to_s.end_with?('_id')
normalized_key = key.to_s.sub(/_id\Z/, '').to_sym
belongs_to?(model_class_node, key: normalized_key, fk: key)
else
any_belongs_to?(model_class_node, association: key)
end
end
def remove_presence_validation(corrector, node, options, presence)
if options.children.one?
corrector.remove(range_by_whole_lines(node.source_range, include_final_newline: true))
else
range = range_with_surrounding_comma(
range_with_surrounding_space(range: presence.source_range, side: :left),
:left
)
corrector.remove(range)
end
end
end
end
end
end