Remove deprecated ActiveModel::Errors#slice!

activemodel/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Remove deprecated `ActiveModel::Errors#slice!`.
+
+    *Rafael Mendonça França*
+
 *   Remove deprecated `ActiveModel::Errors#to_h`.
 
     *Rafael Mendonça França*

activemodel/lib/active_model/errors.rb

@@ -138,25 +138,6 @@ module ActiveModel
       }
     end
 
-    # Removes all errors except the given keys. Returns a hash containing the removed errors.
-    #
-    #   person.errors.keys                  # => [:name, :age, :gender, :city]
-    #   person.errors.slice!(:age, :gender) # => { :name=>["cannot be nil"], :city=>["cannot be nil"] }
-    #   person.errors.keys                  # => [:age, :gender]
-    def slice!(*keys)
-      deprecation_removal_warning(:slice!)
-
-      keys = keys.map(&:to_sym)
-
-      results = messages.dup.slice!(*keys)
-
-      @errors.keep_if do |error|
-        keys.include?(error.attribute)
-      end
-
-      results
-    end
-
     # Search for errors matching +attribute+, +type+ or +options+.
     #
     # Only supplied params will be matched.

activemodel/test/cases/errors_test.rb

@@ -754,30 +754,6 @@ class ErrorsTest < ActiveModel::TestCase
     assert(person.errors.added?(:name, :blank))
   end
 
-  test "slice! removes all errors except the given keys" do
-    person = Person.new
-    person.errors.add(:name, "cannot be nil")
-    person.errors.add(:age, "cannot be nil")
-    person.errors.add(:gender, "cannot be nil")
-    person.errors.add(:city, "cannot be nil")
-
-    assert_deprecated { person.errors.slice!(:age, "gender") }
-
-    assert_equal [:age, :gender], assert_deprecated { person.errors.keys }
-  end
-
-  test "slice! returns the deleted errors" do
-    person = Person.new
-    person.errors.add(:name, "cannot be nil")
-    person.errors.add(:age, "cannot be nil")
-    person.errors.add(:gender, "cannot be nil")
-    person.errors.add(:city, "cannot be nil")
-
-    removed_errors = assert_deprecated { person.errors.slice!(:age, "gender") }
-
-    assert_equal({ name: ["cannot be nil"], city: ["cannot be nil"] }, removed_errors)
-  end
-
   test "errors are marshalable" do
     errors = ActiveModel::Errors.new(Person.new)
     errors.add(:name, :invalid)

guides/source/7_0_release_notes.md

@@ -126,6 +126,8 @@ Please refer to the [Changelog][active-model] for detailed changes.
 
 *   Remove deprecated `ActiveModel::Errors#to_h`.
 
+*   Remove deprecated `ActiveModel::Errors#slice!`.
+
 ### Deprecations
 
 ### Notable changes