Add Popup Cell to new, faked ContentItemFiledType

Author: ElliottAYoung

app/cells/plugins/core/content_item/popup.haml

@@ -0,0 +1,2 @@
+%button{ class: "popup--open mdl-button mdl-js-button mdl-button--raised mdl-button--success mdl-js-ripple-effect" }
+  = render_button_name

app/cells/plugins/core/content_item_cell.rb

@@ -0,0 +1,15 @@
+module Plugins
+  module Core
+    class ContentItemCell < Plugins::Core::Cell
+      def popup
+        render
+      end
+
+      private
+
+      def render_field_name
+        "Insert #{field.name}"
+      end
+    end
+  end
+end

app/models/content_item_field_type.rb

@@ -0,0 +1,11 @@
+class ContentItemFieldType < FieldType
+  def mapping
+    { name: mapping_field_name, type: :string, analyzer: :snowball }
+  end
+
+  private
+
+  def mapping_field_name
+    "#{field_name.parameterize('_')}_content_item"
+  end
+end