implemented team-dependent exercise policy

app/policies/exercise_policy.rb

@@ -4,20 +4,27 @@ class ExercisePolicy < AdminOrAuthorPolicy
   end
   private :author?
 
-  [:clone?, :statistics?].each do |action|
+  [:clone?, :destroy?, :edit?, :show?, :statistics?, :update?].each do |action|
-    define_method(action) { admin? || author? }
+    define_method(action) { admin? || author? || team_member? }
   end
 
   [:implement?, :submit?].each do |action|
     define_method(action) { everyone }
   end
 
+  def team_member?
+    @record.team.try(:members, []).include?(@user)
+  end
+  private :team_member?
+
   class Scope < Scope
     def resolve
       if @user.admin?
         @scope.all
+      elsif @user.internal?
+        @scope.where("user_id = #{@user.id} OR public = TRUE OR (team_id IS NOT NULL AND team_id IN (SELECT t.id FROM teams t JOIN internal_users_teams iut ON t.id = iut.team_id WHERE iut.internal_user_id = #{@user.id}))")
       else
-        @scope.where("user_id = #{@user.id} OR public = TRUE")
+        @scope.none
       end
     end
   end

spec/policies/exercise_policy_spec.rb

@@ -3,7 +3,7 @@ require 'rails_helper'
 describe ExercisePolicy do
   subject { ExercisePolicy }
 
-  let(:exercise) { FactoryGirl.build(:fibonacci) }
+  let(:exercise) { FactoryGirl.build(:fibonacci, team: FactoryGirl.create(:team)) }
 
   [:create?, :index?, :new?].each do |action|
     permissions(action) do
@@ -21,7 +21,7 @@ describe ExercisePolicy do
     end
   end
 
-  [:destroy?, :edit?, :show?, :update?].each do |action|
+  [:clone?, :destroy?, :edit?, :show?, :statistics?, :update?].each do |action|
     permissions(action) do
       it 'grants access to admins' do
         expect(subject).to permit(FactoryGirl.build(:admin), exercise)
@@ -31,6 +31,10 @@ describe ExercisePolicy do
         expect(subject).to permit(exercise.author, exercise)
       end
 
+      it 'grants access to team members' do
+        expect(subject).to permit(exercise.team.members.first, exercise)
+      end
+
       it 'does not grant access to all other users' do
         [:external_user, :teacher].each do |factory_name|
           expect(subject).not_to permit(FactoryGirl.build(factory_name), exercise)
@@ -54,11 +58,15 @@ describe ExercisePolicy do
       let(:admin) { FactoryGirl.create(:admin) }
       let(:external_user) { FactoryGirl.create(:external_user) }
       let(:teacher) { FactoryGirl.create(:teacher) }
+      let(:team) { FactoryGirl.create(:team) }
 
       before(:each) do
         [admin, teacher].each do |user|
           [true, false].each do |public|
-            FactoryGirl.create(:fibonacci, public: public, user_id: user.id, user_type: InternalUser.class.name)
+            team.members << teacher
+            [team, nil].each do |team|
+              FactoryGirl.create(:fibonacci, public: public, team: team, user_id: user.id, user_type: InternalUser.class.name)
+            end
           end
         end
       end
@@ -74,8 +82,8 @@ describe ExercisePolicy do
       context 'for external users' do
         let(:scope) { Pundit.policy_scope!(external_user, Exercise) }
 
-        it 'returns only public exercises' do
+        it 'returns nothing' do
-          expect(scope.map(&:id)).to include(*Exercise.where(public: true).map(&:id))
+          expect(scope.count).to be 0
         end
       end
 
@@ -90,8 +98,12 @@ describe ExercisePolicy do
           expect(scope.map(&:id)).to include(*Exercise.where(public: false, user_id: teacher.id).map(&:id))
         end
 
+        it "includes all of team members' non-public exercises" do
+          expect(scope.map(&:id)).to include(*Exercise.where(public: false, team_id: teacher.teams.first.id).map(&:id))
+        end
+
         it "does not include other authors' non-public exercises" do
-          expect(scope.map(&:id)).not_to include(*Exercise.where(public: false).where("user_id <> #{teacher.id}").map(&:id))
+          expect(scope.map(&:id)).not_to include(*Exercise.where(public: false).where("team_id <> #{teacher.teams.first.id} AND user_id <> #{teacher.id}").map(&:id))
         end
       end
     end