FIX: unable to delete user belonging to a group that grants a trust level

app/models/user.rb

@@ -50,6 +50,11 @@ class User < ActiveRecord::Base
   has_many :email_change_requests, dependent: :destroy
   has_many :directory_items, dependent: :delete_all
   has_many :user_auth_tokens, dependent: :destroy
+
+  has_many :group_users, dependent: :destroy
+  has_many :groups, through: :group_users
+  has_many :secure_categories, through: :groups, source: :categories
+
   has_many :user_emails, dependent: :destroy
 
   has_one :primary_email, -> { where(primary: true)  }, class_name: 'UserEmail', dependent: :destroy
@@ -69,10 +74,6 @@ class User < ActiveRecord::Base
   belongs_to :approved_by, class_name: 'User'
   belongs_to :primary_group, class_name: 'Group'
 
-  has_many :group_users, dependent: :destroy
-  has_many :groups, through: :group_users
-  has_many :secure_categories, through: :groups, source: :categories
-
   has_many :muted_user_records, class_name: 'MutedUser'
   has_many :muted_users, through: :muted_user_records
 

spec/services/user_destroyer_spec.rb

@@ -2,6 +2,10 @@ require 'rails_helper'
 require_dependency 'user_destroyer'
 
 describe UserDestroyer do
+
+  let(:user) { Fabricate(:user) }
+  let(:admin) { Fabricate(:admin) }
+
   describe 'new' do
     it 'raises an error when user is nil' do
       expect { UserDestroyer.new(nil) }.to raise_error(Discourse::InvalidParameters)
@@ -74,8 +78,6 @@ describe UserDestroyer do
     end
 
     context "with a queued post" do
-      let(:user) { Fabricate(:user) }
-      let(:admin) { Fabricate(:admin) }
       let!(:qp) { Fabricate(:queued_post, user: user) }
 
       it "removes the queued post" do
@@ -85,8 +87,6 @@ describe UserDestroyer do
     end
 
     context "with a directory item record" do
-      let(:user) { Fabricate(:user) }
-      let(:admin) { Fabricate(:admin) }
 
       it "removes the directory item" do
         DirectoryItem.create!(
@@ -104,8 +104,6 @@ describe UserDestroyer do
     end
 
     context "with a draft" do
-      let(:user) { Fabricate(:user) }
-      let(:admin) { Fabricate(:admin) }
       let!(:draft) { Draft.set(user, 'test', 1, 'test') }
 
       it "removed the draft" do
@@ -319,7 +317,6 @@ describe UserDestroyer do
     end
 
     context 'user got an email' do
-      let(:user) { Fabricate(:user) }
       let!(:email_log) { Fabricate(:email_log, user: user) }
 
       it "deletes the email log" do
@@ -343,6 +340,21 @@ describe UserDestroyer do
         expect(@post.reload.like_count).to eq(0)
       end
     end
+
+    context 'user belongs to groups that grant trust level' do
+      let(:group) { Fabricate(:group, grant_trust_level: 2) }
+
+      before do
+        group.add(user)
+      end
+
+      it 'can delete the user' do
+        d = UserDestroyer.new(admin)
+        expect {
+          d.destroy(user)
+        }.to change { User.count }.by(-1)
+      end
+    end
   end
 
 end