Merge pull request #80 from mrubi/raise_template_not_found_error

Raises an error when rendering a partial from another template.

lib/lotus/view/rendering/template.rb

@@ -39,7 +39,9 @@ def initialize(view, options)
         # @api private
         # @since 0.1.0
         def render
-          template.render(scope)
+          found_template = template
+          raise_missing_template_error if found_template.nil?
+          found_template.render(scope)
         end
 
         protected
@@ -50,6 +52,12 @@ def template
         def scope
           Scope.new(@view, @options[:locals])
         end
+
+        def raise_missing_template_error
+          template_name = @options[:template] if @options.key?(:template)
+          template_name = @options[:partial] if @options.key?(:partial)
+          raise MissingTemplateError.new(template_name, @options[:format])
+        end
       end
     end
   end

test/fixtures.rb

@@ -39,6 +39,10 @@ def each_thing
   end
 end
 
+class RenderViewWithMissingPartialTemplate
+  include Lotus::View
+end
+
 class JsonRenderView
   include Lotus::View
   format :json

test/fixtures/templates/render_view_with_missing_partial_template.html.erb

@@ -0,0 +1 @@
+<%= render partial: 'shared/missing_template' %>

test/rendering_test.rb

@@ -107,6 +107,13 @@
       rendered.must_match %(<input type="hidden" name="secret" value="23" />)
     end
 
+    it 'raises an error when the partial template is missing' do
+      -> {
+        RenderViewWithMissingPartialTemplate.render(format: :html)
+      }.must_raise(Lotus::View::MissingTemplateError)
+       .message.must_match("Can't find template 'shared/missing_template' for 'html' format.")
+    end
+
     # @issue https://github.com/lotus/view/issues/3
     it 'renders a template within another template' do
       parent = OpenStruct.new(children: [], name: 'parent')