add writer

lib/database_consistency.rb

@@ -38,6 +38,7 @@
 require 'database_consistency/writers/simple/enum_values_inconsistent_with_ar_enum'
 require 'database_consistency/writers/simple/enum_values_inconsistent_with_inclusion'
 require 'database_consistency/writers/simple/redundant_case_insensitive_option'
+require 'database_consistency/writers/simple/three_state_boolean'
 require 'database_consistency/writers/simple_writer'
 
 require 'database_consistency/writers/autofix/helpers/migration'

lib/database_consistency/writers/simple/three_state_boolean.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module DatabaseConsistency
+  module Writers
+    module Simple
+      class ThreeStateBoolean < Base # :nodoc:
+        private
+
+        def template
+          'column should be required in the database'
+        end
+
+        def unique_attributes
+          {
+            table_name: report.table_name,
+            column_name: report.column_name
+          }
+        end
+      end
+    end
+  end
+end

lib/database_consistency/writers/simple_writer.rb

@@ -28,7 +28,8 @@ class SimpleWriter < BaseWriter
         missing_foreign_key_cascade: Simple::MissingForeignKeyCascade,
         enum_values_inconsistent_with_ar_enum: Simple::EnumValuesInconsistentWithArEnum,
         enum_values_inconsistent_with_inclusion: Simple::EnumValuesInconsistentWithInclusion,
-        redundant_case_insensitive_option: Simple::RedundantCaseInsensitiveOption
+        redundant_case_insensitive_option: Simple::RedundantCaseInsensitiveOption,
+        three_state_boolean: Simple::ThreeStateBoolean
       }.freeze
 
       def write