reset assignee after remove member

app/models/collaborator.rb

@@ -110,6 +110,7 @@ class Collaborator
 
   def destroy
     relation.try(:destroy)
+    @actor.check_assigned_issues @project
   end
 
   def attributes

app/models/relation.rb

@@ -35,6 +35,9 @@ class Relation < ActiveRecord::Base
   def self.remove_member(member, target)
     return false if target.respond_to?(:owner) && target.owner == member
     Relation.by_actor(member).by_target(target).each{|r| r.destroy}
+    if member.is_a?(User) && ['Project', 'Group'].include?(target.class.name)
+      member.check_assigned_issues target
+    end
   end
 
   protected

app/models/user.rb

@@ -28,6 +28,7 @@ class User < Avatar
   has_many :own_projects, :as => :owner, :class_name => 'Project', :dependent => :destroy
   has_many :own_groups,   :foreign_key => :owner_id, :class_name => 'Group', :dependent => :destroy
   has_many :own_platforms, :as => :owner, :class_name => 'Platform', :dependent => :destroy
+  has_many :assigned_issues, :foreign_key => :assignee_id, :class_name => 'Issue', :dependent => :nullify
 
   has_many :key_pairs
   has_many :ssh_keys, :dependent => :destroy
@@ -141,6 +142,19 @@ class User < Avatar
     raise "unknown user #{self.uname} roles #{roles}"
   end
 
+  def check_assigned_issues target
+    if target.is_a? Project
+      assigned_issues.where(:project_id => target.id).update_all(:assignee_id => nil)
+    else
+      ability = Ability.new self
+      project_ids = Project.accessible_by(ability, :membered).uniq.pluck(:id)
+
+      issues = assigned_issues
+      issues = issues.where('project_id not in (?)', project_ids) if project_ids.present?
+      issues.update_all(:assignee_id => nil)
+    end
+  end
+
   protected
 
   def target_roles target

spec/models/issue_spec.rb

@@ -41,8 +41,8 @@ describe Issue do
       @project = FactoryGirl.create(:project, :owner => @user)
 
       @group = FactoryGirl.create(:group)
-      reader = FactoryGirl.create :user
-      @group.actors.create(:actor_type => 'User', :actor_id => reader.id, :role => 'reader')
+      @reader = FactoryGirl.create :user
+      @group.actors.create(:actor_type => 'User', :actor_id => @reader.id, :role => 'reader')
     end
 
     it 'should send an e-mail to all members of the admin group' do
@@ -65,6 +65,32 @@ describe Issue do
       create_issue(@stranger)
       ActionMailer::Base.deliveries.count.should == 1 # 1 project owner
     end
+
+    it 'should reset issue assignee after remove him from group' do
+      @project.relations.create!(:actor_type => 'Group', :actor_id => @group.id, :role => 'reader')
+      create_issue(@group.owner)
+      @issue.update_column :assignee_id, @reader.id
+      @group.remove_member @reader
+      @issue.reload.assignee_id.should == nil
+    end
+
+    it 'should not reset issue assignee' do
+      @project.relations.create!(:actor_type => 'Group', :actor_id => @group.id, :role => 'reader')
+      @project.relations.create!(:actor_type => 'User', :actor_id => @reader.id, :role => 'reader')
+      create_issue(@group.owner)
+      @issue.update_column :assignee_id, @reader.id
+      @group.remove_member @reader
+      @issue.reload.assignee_id.should == @reader.id
+    end
+
+    it 'should reset issue assignee after remove him from project' do
+      @project.relations.create!(:actor_type => 'User', :actor_id => @reader.id, :role => 'reader')
+      create_issue(@reader)
+      @issue.update_column :assignee_id, @reader.id
+      @project.remove_member @reader
+      @issue.reload.assignee_id.should == nil
+    end
+
   end
 
   context 'Group project' do