Add max votable headings to groups

app/controllers/admin/budget_groups_controller.rb

@@ -17,7 +17,7 @@ class Admin::BudgetGroupsController < Admin::BaseController
   private
 
     def budget_group_params
-      params.require(:budget_group).permit(:name)
+      params.require(:budget_group).permit(:name, :max_votable_headings)
     end
 
 end

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

@@ -8,6 +8,19 @@
                       maxlength: 50,
                       placeholder: t("admin.budgets.form.group"),
                       class: "input-group-field" %>
+
+    <% if group.persisted? %>
+      <div class="small-12 medium-6 large-4">
+        <%= f.label :name, t("admin.budgets.form.max_votable_headings") %>
+
+        <%= f.select :max_votable_headings,
+                     (1..group.headings.count),
+                     label: false,
+                     placeholder: t("admin.budgets.form.max_votable_headings"),
+                     class: "input-group-field" %>
+      </div>
+    <% end %>
+
     <div class="input-group-button">
       <%= f.submit button_title, class: "button success" %>
     </div>

db/migrate/20180320104823_add_max_votable_headings_to_budget_groups.rb

@@ -0,0 +1,5 @@
+class AddMaxVotableHeadingsToBudgetGroups < ActiveRecord::Migration
+  def change
+    add_column :budget_groups, :max_votable_headings, :integer, default: 1
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20180220211105) do
+ActiveRecord::Schema.define(version: 20180320104823) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -103,6 +103,7 @@ ActiveRecord::Schema.define(version: 20180220211105) do
     t.integer "budget_id"
     t.string  "name",                 limit: 50
     t.string  "slug"
+    t.integer "max_votable_headings",            default: 1
   end
 
   add_index "budget_groups", ["budget_id"], name: "index_budget_groups_on_budget_id", using: :btree

spec/features/admin/budget_groups_spec.rb

@@ -65,4 +65,49 @@ feature 'Admin can change the groups name' do
     expect(page).to have_content('has already been taken')
   end
 
+  context "Maximum votable headings" do
+
+    background do
+      3.times { create(:budget_heading, group: group) }
+    end
+
+    scenario "Defaults to 1 heading per group", :js do
+      visit admin_budget_path(group.budget)
+
+      within("#budget_group_#{group.id}") do
+        click_link 'Edit group'
+
+        expect(page).to have_select('budget_group_max_votable_headings', selected: '1')
+      end
+    end
+
+    scenario "Update", :js do
+      visit admin_budget_path(group.budget)
+
+      within("#budget_group_#{group.id}") do
+        click_link 'Edit group'
+
+        select '2', from: 'budget_group_max_votable_headings'
+        click_button 'Save group'
+      end
+
+      visit admin_budget_path(group.budget)
+
+      within("#budget_group_#{group.id}") do
+        click_link 'Edit group'
+
+        expect(page).to have_select('budget_group_max_votable_headings', selected: '2')
+      end
+    end
+
+    scenario "Do not display maxium votable headings' select in new form", :js do
+      visit admin_budget_path(group.budget)
+
+      click_link 'Add new group'
+
+      expect(page).to have_field('budget_group_name')
+      expect(page).to_not have_field('budget_group_max_votable_headings')
+    end
+
+  end
 end