203 validator custom message error causes test matcher error

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    active_storage_validations (1.1.0)
+    active_storage_validations (1.1.1)
       activejob (>= 5.2.0)
       activemodel (>= 5.2.0)
       activestorage (>= 5.2.0)
@@ -46,6 +46,7 @@ GEM
       zeitwerk (~> 2.3)
     ast (2.4.1)
     builder (3.2.4)
+    byebug (11.1.3)
     coderay (1.1.3)
     combustion (1.3.1)
       activesupport (>= 3.0.0)
@@ -72,6 +73,8 @@ GEM
     mini_magick (4.11.0)
     mini_portile2 (2.5.1)
     minitest (5.14.3)
+    minitest-focus (1.4.0)
+      minitest (>= 4, < 6)
     nokogiri (1.11.3)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
@@ -134,10 +137,12 @@ PLATFORMS
 
 DEPENDENCIES
   active_storage_validations!
+  byebug
   combustion (~> 1.3)
   globalid
   marcel
   mini_magick (>= 4.9.5)
+  minitest-focus (~> 1.4)
   pry
   rubocop
   ruby-vips (>= 2.1.0)

README.md

@@ -368,6 +368,11 @@ BUNDLE_GEMFILE=gemfiles/rails_7_0.gemfile bundle exec rake test
 BUNDLE_GEMFILE=gemfiles/rails_next.gemfile bundle exec rake test
 ```
 
+Tips:
+- To focus a specific test, use the `focus` class method provided by [minitest-focus](https://github.com/minitest/minitest-focus)
+- To focus a specific file, use the TEST option provided by minitest, e.g. to only run size_validator_test.rb file you will execute the following command: `bundle exec rake test TEST=test/validators/size_validator_test.rb``
+
+
 ## Known issues
 
 - There is an issue in Rails which it possible to get if you have added a validation and generating for example an image preview of attachments. It can be fixed with this:

active_storage_validations.gemspec

@@ -19,6 +19,7 @@ Gem::Specification.new do |s|
   s.files = Dir['{app,config,db,lib}/**/*', 'MIT-LICENSE', 'Rakefile', 'README.md']
 
   %w[activejob activemodel activestorage activesupport].each { |rails_subcomponent| s.add_dependency rails_subcomponent, '>= 5.2.0' }
+  s.add_development_dependency 'minitest-focus', "~> 1.4"
   s.add_development_dependency 'combustion', "~> 1.3"
   s.add_development_dependency 'mini_magick', ">= 4.9.5"
   s.add_development_dependency 'ruby-vips', ">= 2.1.0"

gemfiles/rails_6_0.gemfile.lock

@@ -70,9 +70,15 @@ GEM
     mini_magick (4.11.0)
     mini_portile2 (2.8.0)
     minitest (5.16.3)
+    minitest-focus (1.4.0)
+      minitest (>= 4, < 6)
     nokogiri (1.13.8)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
+    nokogiri (1.13.8-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.13.8-x86_64-linux)
+      racc (~> 1.4)
     parallel (1.20.1)
     parser (3.0.0.0)
       ast (~> 2.4.1)
@@ -141,6 +147,7 @@ DEPENDENCIES
   globalid
   marcel
   mini_magick (>= 4.9.5)
+  minitest-focus (~> 1.4)
   pry
   rubocop
   ruby-vips (>= 2.1.0)

gemfiles/rails_6_1.gemfile.lock

@@ -72,9 +72,15 @@ GEM
     mini_magick (4.11.0)
     mini_portile2 (2.8.0)
     minitest (5.16.3)
+    minitest-focus (1.4.0)
+      minitest (>= 4, < 6)
     nokogiri (1.13.8)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
+    nokogiri (1.13.8-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.13.8-x86_64-linux)
+      racc (~> 1.4)
     parallel (1.20.1)
     parser (3.0.0.0)
       ast (~> 2.4.1)
@@ -142,6 +148,7 @@ DEPENDENCIES
   globalid
   marcel
   mini_magick (>= 4.9.5)
+  minitest-focus (~> 1.4)
   pry
   rubocop
   ruby-vips (>= 2.1.0)

gemfiles/rails_7_0.gemfile.lock

@@ -68,6 +68,8 @@ GEM
     mini_mime (1.1.2)
     mini_portile2 (2.8.0)
     minitest (5.16.3)
+    minitest-focus (1.4.0)
+      minitest (>= 4, < 6)
     nokogiri (1.13.8)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
@@ -137,6 +139,7 @@ DEPENDENCIES
   globalid
   marcel
   mini_magick (>= 4.9.5)
+  minitest-focus (~> 1.4)
   pry
   rubocop
   ruby-vips (>= 2.1.0)

gemfiles/rails_next.gemfile.lock

@@ -130,6 +130,8 @@ GEM
     mini_mime (1.1.2)
     mini_portile2 (2.8.2)
     minitest (5.15.0)
+    minitest-focus (1.4.0)
+      minitest (>= 4, < 6)
     net-imap (0.2.3)
       digest
       net-protocol
@@ -215,6 +217,7 @@ DEPENDENCIES
   globalid
   marcel
   mini_magick (>= 4.9.5)
+  minitest-focus (~> 1.4)
   pry
   rails!
   rubocop

lib/active_storage_validations/aspect_ratio_validator.rb

@@ -1,11 +1,13 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
 require_relative 'metadata.rb'
 
 module ActiveStorageValidations
   class AspectRatioValidator < ActiveModel::EachValidator # :nodoc
     include OptionProcUnfolding
     include ErrorHandler
+    include Symbolizable
 
     AVAILABLE_CHECKS = %i[with].freeze
     PRECISION = 3

lib/active_storage_validations/attached_validator.rb

@@ -1,15 +1,20 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
+
 module ActiveStorageValidations
   class AttachedValidator < ActiveModel::EachValidator # :nodoc:
     include ErrorHandler
+    include Symbolizable
+
+    ERROR_TYPES = %i[blank].freeze
 
     def validate_each(record, attribute, _value)
       return if record.send(attribute).attached?
 
       errors_options = initialize_error_options(options)
 
-      add_error(record, attribute, :blank, **errors_options)
+      add_error(record, attribute, ERROR_TYPES.first, **errors_options)
     end
   end
 end

lib/active_storage_validations/concerns/symbolizable.rb

@@ -0,0 +1,10 @@
+module Symbolizable
+  extend ActiveSupport::Concern
+
+  class_methods do
+    def to_sym
+      validator_class = self.name.split("::").last
+      validator_class.sub(/Validator/, '').underscore.to_sym
+    end
+  end
+end

lib/active_storage_validations/content_type_validator.rb

@@ -1,12 +1,16 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
+
 module ActiveStorageValidations
   class ContentTypeValidator < ActiveModel::EachValidator # :nodoc:
     include OptionProcUnfolding
     include ErrorHandler
+    include Symbolizable
 
     AVAILABLE_CHECKS = %i[with in].freeze
-
+    ERROR_TYPES = %i[content_type_invalid].freeze
+
     def validate_each(record, attribute, _value)
       return true unless record.send(attribute).attached?
 
@@ -22,7 +26,7 @@ def validate_each(record, attribute, _value)
         next if is_valid?(file, types)
 
         errors_options[:content_type] = content_type(file)
-        add_error(record, attribute, :content_type_invalid, **errors_options)
+        add_error(record, attribute, ERROR_TYPES.first, **errors_options)
         break
       end
     end

lib/active_storage_validations/dimension_validator.rb

@@ -1,13 +1,28 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
 require_relative 'metadata.rb'
 
 module ActiveStorageValidations
   class DimensionValidator < ActiveModel::EachValidator # :nodoc
     include OptionProcUnfolding
     include ErrorHandler
+    include Symbolizable
 
     AVAILABLE_CHECKS = %i[width height min max].freeze
+    ERROR_TYPES = %i[
+      image_metadata_missing
+      dimension_min_inclusion
+      dimension_max_inclusion
+      dimension_width_inclusion
+      dimension_height_inclusion
+      dimension_width_greater_than_or_equal_to
+      dimension_height_greater_than_or_equal_to
+      dimension_width_less_than_or_equal_to
+      dimension_height_less_than_or_equal_to
+      dimension_width_equal_to
+      dimension_height_equal_to
+    ].freeze
 
     def process_options(record)
       flat_options = unfold_procs(record, self.options, AVAILABLE_CHECKS)

lib/active_storage_validations/error_handler.rb

@@ -3,15 +3,18 @@ module ErrorHandler
 
     def initialize_error_options(options)
       {
-        message: (options[:message] if options[:message].present?)
-      }
+        validator_type: self.class.to_sym,
+        custom_message: (options[:message] if options[:message].present?)
+      }.compact
     end
 
-    def add_error(record, attribute, default_message, **errors_options)
-      message = errors_options[:message].presence || default_message
-      return if record.errors.added?(attribute, message)
+    def add_error(record, attribute, error_type, **errors_options)
+      type = errors_options[:custom_message].presence || error_type
+      return if record.errors.added?(attribute, type)
 
-      record.errors.add(attribute, message, **errors_options)
+      # You can read https://api.rubyonrails.org/classes/ActiveModel/Errors.html#method-i-add
+      # to better understand how Rails model errors work
+      record.errors.add(attribute, type, **errors_options)
     end
 
   end

lib/active_storage_validations/limit_validator.rb

@@ -1,9 +1,12 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
+
 module ActiveStorageValidations
   class LimitValidator < ActiveModel::EachValidator # :nodoc:
     include OptionProcUnfolding
     include ErrorHandler
+    include Symbolizable
 
     AVAILABLE_CHECKS = %i[max min].freeze
 

lib/active_storage_validations/matchers/attached_validator_matcher.rb

@@ -1,12 +1,16 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/validatable.rb'
+
 module ActiveStorageValidations
   module Matchers
     def validate_attached_of(name)
       AttachedValidatorMatcher.new(name)
     end
 
     class AttachedValidatorMatcher
+      include Validatable
+
       def initialize(attribute_name)
         @attribute_name = attribute_name
         @custom_message = nil
@@ -23,7 +27,10 @@ def with_message(message)
 
       def matches?(subject)
         @subject = subject.is_a?(Class) ? subject.new : subject
-        responds_to_methods && valid_when_attached && invalid_when_not_attached
+        responds_to_methods &&
+          is_valid_when_file_attached? &&
+          is_invalid_when_file_not_attached? &&
+          validate_custom_message?
       end
 
       def failure_message
@@ -42,27 +49,44 @@ def responds_to_methods
           @subject.public_send(@attribute_name).respond_to?(:detach)
       end
 
-      def valid_when_attached
-        @subject.public_send(@attribute_name).attach(attachable) unless @subject.public_send(@attribute_name).attached?
-        @subject.validate
-        @subject.errors.details[@attribute_name].exclude?(error: error_message)
+      def is_valid_when_file_attached?
+        attach_dummy_file unless file_attached?
+        validate
+        is_valid?
       end
 
-      def invalid_when_not_attached
-        @subject.public_send(@attribute_name).detach
-        # Unset the direct relation since `detach` on an unpersisted record does not set `attached?` to false.
-        @subject.public_send("#{@attribute_name}=", nil)
+      def is_invalid_when_file_not_attached?
+        detach_file if file_attached?
+        validate
+        !is_valid?
+      end
+
+      def validate_custom_message?
+        return true unless @custom_message
 
-        @subject.validate
-        @subject.errors.details[@attribute_name].include?(error: error_message)
+        detach_file if file_attached?
+        validate
+        has_an_error_message_which_is_custom_message?
       end
 
-      def error_message
-        @custom_message || :blank
+      def attach_dummy_file
+        dummy_file = {
+          io: Tempfile.new('.'),
+          filename: 'dummy.txt',
+          content_type: 'text/plain'
+        }
+
+        @subject.public_send(@attribute_name).attach(dummy_file)
+      end
+
+      def file_attached?
+        @subject.public_send(@attribute_name).attached?
       end
 
-      def attachable
-        { io: Tempfile.new('.'), filename: 'dummy.txt', content_type: 'text/plain' }
+      def detach_file
+        @subject.public_send(@attribute_name).detach
+        # Unset the direct relation since `detach` on an unpersisted record does not set `attached?` to false.
+        @subject.public_send("#{@attribute_name}=", nil)
       end
     end
   end