Allow binding goal saving w/o exposures and disallow destruction

app/controllers/concerns/finders.rb

@@ -1,6 +1,13 @@
 module Concerns::Finders
   private
 
+  def find_goal(id = params[:id])
+    @goal = Goal.find(id)
+    @project = @goal.project
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
   def find_meal
     @meal = Meal.find(params[:id])
     @project = @meal.project

app/controllers/targets_controller.rb

@@ -22,9 +22,9 @@ class TargetsController < ApplicationController
   end
 
   def create
-    goal = @project.goals.binding if params[:goal][:id].blank?
+    goal_id = params[:goal][:id]
-    goal ||= @project.goals.find_by(id: params[:goal][:id])
+    goal = goal_id.present? ? @project.goals.find(goal_id) : @project.goals.new
-    goal ||= @project.goals.build(goal_params)
+    goal.attributes = goal_params unless goal.is_binding?
 
     @targets = goal.targets.build(targets_params[:targets]) do |target|
       target.effective_from = params[:target][:effective_from]
@@ -70,7 +70,7 @@ class TargetsController < ApplicationController
   private
 
   def goal_params
-    params.require(:goal).permit(:id, :name, :description)
+    params.require(:goal).permit(:name, :description)
   end
 
   def targets_params

app/models/goal.rb

@@ -6,7 +6,7 @@ class Goal < ActiveRecord::Base
     class_name: 'Exposure', extend: BodyTracking::TogglableExposures
   has_many :quantities, -> { order "lft" }, through: :target_exposures
 
-  validates :target_exposures, presence: true
+  validates :target_exposures, presence: true, unless: :is_binding?
   validates :is_binding, uniqueness: {scope: :project_id}, if: :is_binding?
   validates :name, presence: true, uniqueness: {scope: :project_id},
     exclusion: {in: [I18n.t('targets.form.binding_goal')], unless: :is_binding?}
@@ -16,4 +16,7 @@ class Goal < ActiveRecord::Base
       self.is_binding = false if self.is_binding.nil?
     end
   end
+  before_destroy prepend: true do
+    !is_binding?
+  end
 end

lib/body_tracking/project_patch.rb

@@ -31,7 +31,7 @@ module BodyTracking::ProjectPatch
 
     has_many :goals, dependent: :destroy do
       def binding
-        find_or_initialize_by(is_binding: true) do |goal|
+        find_or_create_by(is_binding: true) do |goal|
           goal.name = I18n.t('targets.form.binding_goal')
         end
       end

test/fixtures/goals.yml

@@ -2,3 +2,7 @@ goals_binding:
   project_id: 1
   is_binding: true
   name: "<%= I18n.t 'targets.form.binding_goal' %>"
+goals_non_binding:
+  project_id: 1
+  is_binding: false
+  name: "Non-binding goal"

test/system/targets_test.rb

@@ -23,7 +23,7 @@ class TargetsTest < BodyTrackingSystemTestCase
     assert_selector 'div#targets', visible: :yes, exact_text: t(:label_no_data)
   end
 
-  def test_index_shows_and_hides_new_target_form
+  def test_index_show_and_hide_new_target_form
     visit project_targets_path(@project1)
     assert_no_selector 'form#new-target-form'
     click_link t('targets.contextual.link_new_target')
@@ -33,7 +33,8 @@ class TargetsTest < BodyTrackingSystemTestCase
   end
 
   def test_create_binding_target
-    assert @project1.goals.exists?(is_binding: true)
+    assert_difference 'Goal.count' => 0, 'Target.count' => 1,
+                      '@project1.targets.reload.count' => 1, 'Threshold.count' => 1 do
       visit project_targets_path(@project1)
       click_link t('targets.contextual.link_new_target')
       within 'form#new-target-form' do
@@ -45,11 +46,10 @@ class TargetsTest < BodyTrackingSystemTestCase
           fill_in with: '1750'
           select units(:units_kcal).shortname
         end
-      assert_difference 'Target.count' => 1, '@project1.targets.reload.count' => 1,
-        'Threshold.count' => 1, 'Goal.count' => 0 do
         click_on t(:button_create)
       end
     end
+    assert_equal @project1.goals.binding, Target.last.goal
     assert_no_selector 'form#new-target-form'
     assert_selector 'table#targets tbody tr', count: @project1.targets.count
   end
@@ -57,20 +57,24 @@ class TargetsTest < BodyTrackingSystemTestCase
   def test_create_binding_target_when_binding_goal_does_not_exist
     @project1.goals.where(is_binding: true).delete_all
     assert_equal 0, @project1.goals.count(&:is_binding?)
+    assert_difference ['Goal.count', '@project1.goals.reload.count(&:is_binding?)',
+                       '@project1.targets.reload.count'], 1 do
       visit project_targets_path(@project1)
       click_link t('targets.contextual.link_new_target')
       within 'form#new-target-form' do
-      # Assume binding Goal is initialized (not saved) and selected by default
+        # Assume binding Goal is selected by default
         within 'p.target' do
           select quantities(:quantities_energy).name
           select '=='
           fill_in with: '1750'
           select units(:units_kcal).shortname
         end
-      assert_difference ['Goal.count', '@project1.goals.reload.count(&:is_binding?)'], 1 do
         click_on t(:button_create)
       end
     end
-    assert_selector 'table#targets tbody tr', count: 1
+    assert_equal @project1.goals.binding, Target.last.goal
+  end
+
+  def test_edit
   end
 end