Issue 96

pakyow-presenter/lib/pakyow/presenter/base.rb

@@ -2,6 +2,7 @@
 
 require 'pakyow/presenter/view_store'
 require 'pakyow/presenter/view'
+require 'pakyow/presenter/form'
 require 'pakyow/presenter/template'
 require 'pakyow/presenter/page'
 require 'pakyow/presenter/container'

pakyow-presenter/lib/pakyow/presenter/form.rb

@@ -0,0 +1,64 @@
+module Pakyow
+  module Presenter
+    class Form
+      attr_reader :view, :context
+
+      PATCH_METHOD_INPUT = <<-HTML
+        <input type="hidden" name="_method" value="patch">
+      HTML
+
+      def initialize(view, context)
+        @view = view
+        @context = context
+      end
+
+      def create(*binding_args, &block)
+        bind_form_action(binding_args, block) do |view|
+          view.attrs.action = routes.path(:create, request_params) if routes
+        end
+      end
+
+      def update(*binding_args, &block)
+        bind_form_action(binding_args, block) do |view|
+          if routes
+            route_params = request_params.merge(
+              :"#{scoped_as}_id" => view.attrs.__send__('data-id').value
+            )
+
+            view.attrs.action = routes.path(:update, route_params)
+          end
+
+          view.prepend(View.new(PATCH_METHOD_INPUT))
+        end
+      end
+
+      private
+
+      def bind_form_action(binding_args, block)
+        data = binding_args.first
+
+        view.bind(binding_args) { |view, _| yield(view) }
+
+        return if block.nil?
+
+        if block.arity == 1
+          view.instance_exec(data, &block)
+        else
+          block.call(view, data)
+        end
+      end
+
+      def routes
+        @routes ||= Router.instance.group(scoped_as)
+      end
+
+      def scoped_as
+        view.scoped_as
+      end
+
+      def request_params
+        context.request.params
+      end
+    end
+  end
+end

pakyow-presenter/lib/pakyow/presenter/view_context.rb

@@ -59,6 +59,11 @@ def subject
         end
       end
 
+      def form(*scope_args)
+        view = scope(*scope_args).subject
+        Form.new(view, context)
+      end
+
       # Pass these through, handling the return value.
       #
       def method_missing(method, *args, &block)

pakyow-presenter/spec/integration/support/mixins/form_binding_specs.rb

@@ -14,6 +14,64 @@
     D
   }
 
+  let(:router) { Pakyow::Router.instance }
+  let(:group) { Pakyow::Router.instance.group(:foo) }
+  let(:request) { mock_request }
+  let(:app_context) { Pakyow::AppContext.new(request, nil) }
+  let(:view_context) { Pakyow::Presenter::ViewContext.new(view, app_context) }
+
+  context 'when creating a form' do
+    it 'sets the action' do
+      expect(request).to receive(:params) { {} }
+      expect(group).to receive(:path) { '/foo' }.with(:create, {})
+      expect(router).to receive(:group) { group }.with(:foo)
+
+      view_context.form(:foo).create({})
+      expect(view.scope(:foo).first.instance_variable_get(:@doc).to_s).to include %(action="/foo")
+    end
+
+    context 'with a block' do
+      before :each do
+        expect(group).to receive(:path) { '/foo' }.with(:create, {})
+        expect(router).to receive(:group) { group }.with(:foo)
+      end
+
+      context 'with one argument' do
+        it 'evaluates the block in the view context and passes the data' do
+          block = lambda { |data| prop(:named) }
+          form = view_context.form(:foo)
+
+          expect(form.view).to receive(:prop)
+          form.create({}, &block)
+        end
+      end
+
+      context 'with more than one argument' do
+        it 'calls the block with the view and data' do
+          block = lambda { |view, data| @view, @data = view, data }
+          form = view_context.form(:foo)
+          form.create({}, &block)
+
+          expect(@view).to eq form.view
+          expect(@data).to eq({})
+        end
+      end
+    end
+  end
+
+  context 'when updating a form' do
+    it 'sets the _method and action' do
+      expect(request).to receive(:params) { { other: 'param' } }
+      expect(group).to receive(:path) { '/foo/1' }.with(:update, foo_id: 1, other: 'param')
+      expect(router).to receive(:group) { group }.with(:foo)
+
+      view_context.form(:foo).update(id: 1)
+      html = view.scope(:foo).first.instance_variable_get(:@doc).to_s
+      expect(html).to include %(name="_method" value="patch")
+      expect(html).to include %(action="/foo/1")
+    end
+  end
+
   context 'when binding to unnamed field' do
     it 'sets name attr' do
       view.scope(:foo).bind(unnamed: 'test')