Add rich text field

app/views/fields/rich_text/_form.html.erb

@@ -0,0 +1,22 @@
+<%#
+# Text Form Partial
+
+This partial renders a textarea element for a text attribute.
+
+## Local variables:
+
+- `f`:
+  A Rails form generator, used to help create the appropriate input fields.
+- `field`:
+  An instance of [Administrate::Field::Text][1].
+  A wrapper around the Text pulled from the database.
+
+[1]: http://www.rubydoc.info/gems/administrate/Administrate/Field/Text
+%>
+
+<div class="field-unit__label">
+  <%= f.label field.attribute %>
+</div>
+<div class="field-unit__field">
+  <%= f.rich_text_area field.attribute, data: { controller: "mentions", target: "mentions.field" } %>
+</div>

app/views/fields/rich_text/_index.html.erb

@@ -0,0 +1,18 @@
+<%#
+# Text Index Partial
+
+This partial renders a text attribute
+to be displayed on a resource's index page.
+
+By default, the attribute is rendered as a truncated string.
+
+## Local variables:
+
+- `field`:
+  An instance of [Administrate::Field::Text][1].
+  A wrapper around the Text pulled from the database.
+
+[1]: http://www.rubydoc.info/gems/administrate/Administrate/Field/Text
+%>
+
+<%= field.truncate %>

app/views/fields/rich_text/_show.html.erb

@@ -0,0 +1,18 @@
+<%#
+# Text Show Partial
+
+This partial renders a text attribute,
+to be displayed on a resource's show page.
+
+By default, the attribute is rendered as text with whitespace preserved.
+
+## Local variables:
+
+- `field`:
+  An instance of [Administrate::Field::Text][1].
+  A wrapper around the Text pulled from the database.
+
+[1]: http://www.rubydoc.info/gems/administrate/Administrate/Field/Text
+%>
+
+<div class="preserve-whitespace"><%= field.data %></div>

lib/administrate/field/rich_text.rb

@@ -0,0 +1,11 @@
+require "administrate/field/text"
+
+module Administrate
+  module Field
+    class RichText < Administrate::Field::Text
+      def to_s
+        data
+      end
+    end
+  end
+end