Add initial implementation

Author: kuroda

lib/vue-form-for.rb

@@ -0,0 +1,2 @@
+require 'vue-form-for/form_builder'
+require 'vue-form-for/railtie' if defined?(Rails)

lib/vue-form-for/form_builder.rb

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+module VueFormFor
+  class FormBuilder < ActionView::Helpers::FormBuilder
+    (field_helpers - [:label, :fields_for]).each do |selector|
+      class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
+        def #{selector}(method, options = {})
+          options[:"v-model"] ||= "\#{@object_name}.\#{method}"
+          super(method, options)
+        end
+      RUBY_EVAL
+    end
+  end
+end

lib/vue-form-for/form_helpers.rb

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+module VueFormFor
+  module FormHelpers
+    def vue_form_for(record, options = {}, &block)
+      options[:builder] ||= VueFormFor::FormBuilder
+      form_for(record, options, &block)
+    end
+  end
+end

lib/vue-form-for/railtie.rb

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+require 'vue-form-for/form_helpers'
+
+module VueFormFor
+  class Railtie < Rails::Railtie
+    initializer "vue-form-for.view_form_helpers" do
+      ActiveSupport.on_load :action_view do
+        include VueFormFor::FormHelpers
+      end
+    end
+  end
+end