Add rule deletion

lib/frenzy/rule.ex

@@ -7,6 +7,7 @@ defmodule Frenzy.Rule do
     field :property, :string
     field :param, :string
     field :weight, :integer
+    field :delete, :boolean, virtual: true
 
     belongs_to :filter, Frenzy.Filter
 
@@ -16,7 +17,16 @@ defmodule Frenzy.Rule do
   @doc false
   def changeset(rule, attrs) do
     rule
-    |> cast(attrs, [:mode, :property, :param, :weight])
+    |> cast(attrs, [:mode, :property, :param, :weight, :delete])
+    |> set_delete_action()
     |> validate_required([:mode, :property, :param, :weight])
   end
+
+  def set_delete_action(changeset) do
+    if get_change(changeset, :delete) do
+      %{changeset | action: :delete}
+    else
+      changeset
+    end
+  end
 end

lib/frenzy_web/templates/filter/edit.html.eex

@@ -15,6 +15,7 @@
       <th>Mode</th>
       <th>Param</th>
       <th>Weight</th>
+      <th>Delete?</th>
     </tr>
     <%= inputs_for form, :rules, fn p -> %>
       <tr>
@@ -30,6 +31,9 @@
         <td>
           <%= number_input p, :weight %>
         </td>
+        <td>
+          <%= checkbox p, :delete %>
+        </td>
       </tr>
     <% end %>
   </table>