Add population field to admin Budget Heading form and headings list table

app/views/admin/budgets/_group.html.erb

@@ -1,7 +1,7 @@
 <table>
   <thead>
     <tr>
-      <th colspan="2" class="with-button">
+      <th colspan="3" class="with-button">
         <%= group.name %>
         <%= link_to t("admin.budgets.form.add_heading"), "#", class: "button float-right js-toggle-link", data: { "toggle-selector" => "#group-#{group.id}-new-heading-form" } %>
       </th>
@@ -21,6 +21,7 @@
     <tr>
       <th><%= t("admin.budgets.form.table_heading") %></th>
       <th><%= t("admin.budgets.form.table_amount") %></th>
+      <th><%= t("admin.budgets.form.table_population") %></th>
     </tr>
   </thead>
   <tbody>
@@ -45,6 +46,15 @@
                                 placeholder: t("admin.budgets.form.amount") %>
             </div>
           </div>
+          <div class="row">
+            <div class="small-12 medium-6 column">
+              <label><%= t("admin.budgets.form.population") %></label>
+              <%= f.text_field :population,
+                                label: false,
+                                maxlength: 8,
+                                placeholder: t("admin.budgets.form.population") %>
+            </div>
+          </div>
 
           <%= f.submit t("admin.budgets.form.save_heading"), class: "button success" %>
         <% end %>
@@ -60,6 +70,9 @@
       <td>
         <%= heading.price %>
       </td>
+      <td>
+        <%= heading.population %>
+      </td>
     </tr>
     <% end %>
     <!-- /. headings list -->

db/migrate/20170621180611_add_population_to_budget_headings.rb

@@ -1,5 +1,5 @@
 class AddPopulationToBudgetHeadings < ActiveRecord::Migration
   def change
-    add_column :budget_headings, :population, :integer, default: 0
+    add_column :budget_headings, :population, :integer, default: nil
   end
 end

db/schema.rb

@@ -110,7 +110,7 @@ ActiveRecord::Schema.define(version: 20170621180611) do
     t.integer "group_id"
     t.string  "name",     limit: 50
     t.integer "price",    limit: 8
-    t.integer "population",            default: 0
+    t.integer "population"
   end
 
   add_index "budget_headings", ["group_id"], name: "index_budget_headings_on_group_id", using: :btree