diff --git a/devops-service/app/api2/handlers/project.rb b/devops-service/app/api2/handlers/project.rb
index 5b52990..58a9b07 100644
--- a/devops-service/app/api2/handlers/project.rb
+++ b/devops-service/app/api2/handlers/project.rb
@@ -119,12 +119,9 @@ module Devops
         def update_project_users id
           deploy_env, users = parser.project_users
           project = Devops::Db.connector.project(id)
-          dbusers = Devops::Db.connector.users(users).map{|u| u.id}
-          buf = dbusers - users
+          Validators::Helpers::Users.new(run_list).validate!
           project.add_authorized_user users, deploy_env
-          Devops::Db.connector.project_update(project)
-          info = "Users '#{dbusers.join("', '")}' has been added to '#{id}' project's authorized users"
-          info << ", invalid users: '#{buf.join("', '")}'" unless buf.empty?
+          info = "Users '#{users.join("', '")}' has been added to '#{id}' project's authorized users."
           info
         end
 
@@ -133,7 +130,6 @@ module Devops
           deploy_env, users = parser.project_users
           project = Devops::Db.connector.project(id)
           project.remove_authorized_user users, deploy_env
-          Devops::Db.connector.project_update project
           "Users '#{users.join("', '")}' have been removed from '#{id}' project's authorized users"
         end
 
diff --git a/devops-service/db/mongo/connectors/project.rb b/devops-service/db/mongo/connectors/project.rb
index d601584..4824e10 100644
--- a/devops-service/db/mongo/connectors/project.rb
+++ b/devops-service/db/mongo/connectors/project.rb
@@ -97,9 +97,13 @@ module Connectors
       project
     end
 
+    def set_project_deploy_env_field(project_id, env, field, value)
+      @collection.update({"_id" => project_id, "deploy_envs.identifier" => env}, {"$set" => {"deploy_envs.$.#{field}" => value}})
+    end
+
     def set_project_env_run_list(project_id, env, run_list)
       Helpers::RunList.new(run_list).validate!
-      @collection.update({"_id" => project_id, "deploy_envs.identifier" => env}, {"$set" => {"deploy_envs.$.run_list" => run_list}})
+      set_project_deploy_env_field(project_id, env, "run_list", run_list)
     end
 
     def set_project_run_list(project_id, env, run_list)
diff --git a/devops-service/db/mongo/models/project.rb b/devops-service/db/mongo/models/project.rb
index 55216b2..c934d56 100644
--- a/devops-service/db/mongo/models/project.rb
+++ b/devops-service/db/mongo/models/project.rb
@@ -73,11 +73,13 @@ module Devops
           self.deploy_envs.each do |e|
             return unless e.users.is_a?(Array)
             e.users = (e.users + new_users).uniq
+            Devops::Db.connector.set_project_deploy_env_field(self.id, e.identifier, "users", e.users)
           end
         else
           e = self.deploy_env(env)
           return unless e.users.is_a?(Array)
           e.users = (e.users + new_users).uniq
+          Devops::Db.connector.set_project_deploy_env_field(self.id, e.identifier, "users", e.users)
         end
       end
 
@@ -88,11 +90,13 @@ module Devops
           self.deploy_envs.each do |e|
             return unless e.users.is_a?(Array)
             e.users = e.users - users
+            Devops::Db.connector.set_project_deploy_env_field(self.id, e.identifier, "users", e.users)
           end
         else
           e = self.deploy_env(env)
           return unless e.users.is_a?(Array)
           e.users = e.users - users
+          Devops::Db.connector.set_project_deploy_env_field(self.id, e.identifier, "users", e.users)
         end
       end
 
diff --git a/devops-service/db/mongo/mongo_connector.rb b/devops-service/db/mongo/mongo_connector.rb
index 79f147e..75bb8a1 100644
--- a/devops-service/db/mongo/mongo_connector.rb
+++ b/devops-service/db/mongo/mongo_connector.rb
@@ -21,7 +21,7 @@ class MongoConnector
     [:available_images, :add_available_images, :delete_available_images] => :filters_connector,
     [:project, :projects_all, :projects, :project_names_with_envs,
     :projects_by_image, :projects_by_user, :project_insert, :project_update,
-    :project_delete, :is_project_exists?, :check_project_auth, :set_project_run_list, :set_project_env_run_list, :add_deploy_env_to_project, :remove_deploy_env_from_project, :project_update_field] => :projects_connector,
+    :project_delete, :is_project_exists?, :check_project_auth, :set_project_run_list, :set_project_deploy_env_field, :set_project_env_run_list, :add_deploy_env_to_project, :remove_deploy_env_from_project, :project_update_field] => :projects_connector,
     [:project_templates, :project_template_insert, :project_template_update,
     :project_template_delete] => :projects_templates_connector,
     [:servers_find, :servers, :stack_servers, :servers_by_names, :server_by_instance_id,
diff --git a/devops-service/db/validators/deploy_env/users.rb b/devops-service/db/validators/deploy_env/users.rb
index 7aa022b..ceeeebf 100644
--- a/devops-service/db/validators/deploy_env/users.rb
+++ b/devops-service/db/validators/deploy_env/users.rb
@@ -1,14 +1,5 @@
 module Validators
   class DeployEnv::Users < Base
-
-    def valid?
-      mongo_users = ::Devops::Db.connector.users_names(@model.users)
-      @nonexistent_users = @model.users - mongo_users
-      @nonexistent_users.empty?
-    end
-
-    def message
-      Devops::Messages.t("project.deploy_env.validation.users.not_exist", users: @nonexistent_users.join("', '"))
-    end
+    delegate_to_helper_validator { Helpers::Users.new(@model.users) }
   end
 end
diff --git a/devops-service/db/validators/helpers/users.rb b/devops-service/db/validators/helpers/users.rb
new file mode 100644
index 0000000..586bfe0
--- /dev/null
+++ b/devops-service/db/validators/helpers/users.rb
@@ -0,0 +1,14 @@
+module Validators
+  class Helpers::Users < Base
+
+    def valid?
+      mongo_users = ::Devops::Db.connector.users_names(@model)
+      @nonexistent_users = @model - mongo_users
+      @nonexistent_users.empty?
+    end
+
+    def message
+      Devops::Messages.t("project.deploy_env.validation.users.not_exist", users: @nonexistent_users.join("', '"))
+    end
+  end
+end