add option to ignore columns matching a regex with -I or --ignore-columns

bin/annotate

@@ -134,6 +134,11 @@ OptionParser.new do |opts|
   opts.on('--trace', 'If unable to annotate a file, print the full stack trace, not just the exception message.') do |value|
     ENV['trace'] = 'yes'
   end
+
+  opts.on('-I', '--ignore-columns REGEX', "don't annotate columns that match a given REGEX (i.e., `annotate -I '^(id|updated_at|created_at)'`" ) do |regex|
+    ENV['ignore_columns'] = regex
+  end
+
 end.parse!
 
 

lib/annotate.rb

@@ -25,7 +25,7 @@ module Annotate
     :format_bare, :format_rdoc, :format_markdown, :sort, :force, :trace,
   ]
   OTHER_OPTIONS=[
-    :model_dir,
+    :model_dir, :ignore_columns
   ]
   PATH_OPTIONS=[
     :require,

lib/annotate/annotate_models.rb

@@ -108,6 +108,9 @@ module AnnotateModels
       end
 
       cols = klass.columns
+      if options[:ignore_columns]
+        cols.reject! { |col| col.name.match(/#{options[:ignore_columns]}/) }
+      end
       cols = cols.sort_by(&:name) if(options[:sort])
       cols.each do |col|
         attrs = []

spec/annotate/annotate_models_spec.rb

@@ -396,6 +396,12 @@ end
       File.read(@model_file_name).should == "#{@file_content}\n#{another_schema_info}"
     end
 
+    it 'should skip columns with option[:ignore_columns] set' do
+      output = AnnotateModels.get_schema_info(@klass, "== Schema Info",
+                                              :ignore_columns => '(id|updated_at|created_at)')
+      expect(output.match(/id/)).to be_nil
+    end
+
     it "works with namespaced models (i.e. models inside modules/subdirectories)" do
       (model_file_name, file_content) = write_model "foo/user.rb", <<-EOS
 class Foo::User < ActiveRecord::Base