[Fix #1016] Add RedundantActiveRecordAllMethod cop

changelog/fix_add_redundant_active_record_all_method.md

@@ -0,0 +1 @@
+* [#1016](https://github.com/rubocop/rubocop-rails/issues/1016): Add `Rails/RedundantActiveRecordAllMethod` cop. ([@masato-bkn][])

config/default.yml

@@ -775,6 +775,13 @@ Rails/ReadWriteAttribute:
   Include:
     - app/models/**/*.rb
 
+Rails/RedundantActiveRecordAllMethod:
+  Description: Detect redundant `all` used as a receiver for Active Record query methods.
+  StyleGuide: 'https://rails.rubystyle.guide/#redundant-all'
+  Enabled: pending
+  Safe: false
+  VersionAdded: "<<next>>"
+
 Rails/RedundantAllowNil:
   Description: >-
                  Finds redundant use of `allow_nil` when `allow_blank` is set to

lib/rubocop/cop/rails/redundant_active_record_all_method.rb

@@ -0,0 +1,145 @@
+# frozen_string_literal: true
+
+module RuboCop
+  module Cop
+    module Rails
+      # Detect redundant `all` used as a receiver for Active Record query methods.
+      #
+      # @safety
+      #   This cop is unsafe for autocorrection if the receiver for `all` is not an Active Record object.
+      #
+      # @example
+      #   # bad
+      #   User.all.find(id)
+      #   User.all.order(:created_at)
+      #   users.all.where(id: ids)
+      #   user.articles.all.order(:created_at)
+      #
+      #   # good
+      #   User.find(id)
+      #   User.order(:created_at)
+      #   users.where(id: ids)
+      #   user.articles.order(:created_at)
+      class RedundantActiveRecordAllMethod < Base
+        include ActiveRecordHelper
+        extend AutoCorrector
+
+        MSG = 'Redundant `all` detected.'
+
+        RESTRICT_ON_SEND = [:all].freeze
+
+        # Defined methods in `ActiveRecord::Querying::QUERYING_METHODS` on activerecord 7.0.5.
+        QUERYING_METHODS = %i[
+          and
+          annotate
+          any?
+          average
+          calculate
+          count
+          create_or_find_by
+          create_or_find_by!
+          create_with
+          delete_all
+          delete_by
+          destroy_all
+          destroy_by
+          distinct
+          eager_load
+          except
+          excluding
+          exists?
+          extending
+          extract_associated
+          fifth
+          fifth!
+          find
+          find_by
+          find_by!
+          find_each
+          find_in_batches
+          find_or_create_by
+          find_or_create_by!
+          find_or_initialize_by
+          find_sole_by
+          first
+          first!
+          first_or_create
+          first_or_create!
+          first_or_initialize
+          forty_two
+          forty_two!
+          fourth
+          fourth!
+          from
+          group
+          having
+          ids
+          in_batches
+          in_order_of
+          includes
+          invert_where
+          joins
+          last
+          last!
+          left_joins
+          left_outer_joins
+          limit
+          lock
+          many?
+          maximum
+          merge
+          minimum
+          none
+          none?
+          offset
+          one?
+          only
+          optimizer_hints
+          or
+          order
+          pick
+          pluck
+          preload
+          readonly
+          references
+          reorder
+          reselect
+          rewhere
+          second
+          second!
+          second_to_last
+          second_to_last!
+          select
+          sole
+          strict_loading
+          sum
+          take
+          take!
+          third
+          third!
+          third_to_last
+          third_to_last!
+          touch_all
+          unscope
+          update_all
+          where
+          without
+        ].freeze
+
+        def on_send(node)
+          query_node = node.parent
+
+          return unless query_node&.send_type?
+          return unless QUERYING_METHODS.include?(query_node.method_name)
+          return if node.receiver.nil? && !inherit_active_record_base?(node)
+
+          range_of_all_method = node.loc.selector
+          add_offense(range_of_all_method) do |collector|
+            collector.remove(range_of_all_method)
+            collector.remove(query_node.loc.dot)
+          end
+        end
+      end
+    end
+  end
+end

lib/rubocop/cop/rails_cops.rb

@@ -87,6 +87,7 @@
 require_relative 'rails/present'
 require_relative 'rails/rake_environment'
 require_relative 'rails/read_write_attribute'
+require_relative 'rails/redundant_active_record_all_method'
 require_relative 'rails/redundant_allow_nil'
 require_relative 'rails/redundant_foreign_key'
 require_relative 'rails/redundant_presence_validation_on_belongs_to'