add generators

README.md

@@ -29,6 +29,16 @@ Or install it yourself as:
 1. Add permitted params inside the class
 1. Use it as a normal model (without strong_params)
 
+## Generator
+
+Use the supplied generator to generate forms:
+
+    $ rails g active_form_model:form sign_up --model=user
+
+or with namespace model
+
+    $ rails g active_form_model:form admin_post --model=blog/post
+
 ### Example
 
 ```ruby

lib/generators/active_form_model/USAGE

@@ -0,0 +1,8 @@
+Description:
+    Generates a form for a model with the given name.
+
+Example:
+    rails generate active_form_model:form sign_up --model=user
+
+    This will create:
+        app/forms/user_form.rb

lib/generators/active_form_model/form_generator.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module ActiveFormModel
+  module Generators
+    class FormGenerator < ::Rails::Generators::NamedBase
+      class_option :model, type: :string
+      source_root File.expand_path('templates', __dir__)
+
+      def create_form
+        template 'form.rb', File.join('app/forms', class_path, "#{file_name}_form.rb")
+      end
+    end
+  end
+end

lib/generators/active_form_model/templates/form.rb

@@ -0,0 +1,5 @@
+<% module_namespacing do -%>
+class <%= class_name %>Form < <%= options['model'].classify %>
+  include ActiveFormModel
+end
+<% end -%>