cleanup and add mod message if needed

assets/javascripts/discourse/templates/modal/assign-user.hbs

@@ -1,5 +1,5 @@
-{{#d-modal-body title="discourse_assigns.assign_modal.title" class="assign"}}
+{{#d-modal-body title="discourse_assign.assign_modal.title" class="assign"}}
-{{i18n 'discourse_assigns.assign_modal.description'}}
+{{i18n 'discourse_assign.assign_modal.description'}}
 {{user-selector
     single=true
     allowAny=false
@@ -12,5 +12,5 @@
 {{/d-modal-body}}
 
 <div class="modal-footer">
-{{d-button label='discourse_assigns.assign_modal.assign' icon=inviteIcon action="assign" class="btn-primary" disabled=disabled}}
+{{d-button label='discourse_assign.assign_modal.assign' icon=inviteIcon action="assign" class="btn-primary" disabled=disabled}}
 </div>

assets/javascripts/templates/connectors/topic-footer-main-buttons-before-create/assign-button.hbs

@@ -1,5 +1,5 @@
 {{d-button class="assign"
            icon="user-plus"
            action="assign"
-           label="discourse_assigns.assign.title"
+           label="discourse_assign.assign.title"
-           title="discourse_assigns.assign.help"}}
+           title="discourse_assign.assign.help"}}

config/locales/client.en.yml

@@ -1,6 +1,8 @@
 en:
   js:
-    discourse_assigns:
+    action_codes:
+      assigned: "assigned"
+    discourse_assign:
       assign:
         title: "Assign"
         help: "Assign Topic to User"

config/locales/server.en.yml

@@ -0,0 +1,3 @@
+en:
+  discourse_assign:
+    assigned_to: "Topic assigned to @%{username}"

plugin.rb

@@ -37,11 +37,23 @@ SQL
       topic_id = params.require(:topic_id)
       username = params.require(:username)
 
-      assigned = AssignedUser.where(topic_id: topic_id).first_or_initialize
+      topic = Topic.find(topic_id.to_i)
-      assigned.assigned_to_id = User.where(username_lower: username.downcase).pluck(:id).first
+      assign_to = User.find_by(username_lower: username.downcase)
+
+      raise Discourse::NotFound unless assign_to
+
+      assigned = AssignedUser.where(topic_id: topic.id).first_or_initialize
+      assigned.assigned_to_id = assign_to.id
       assigned.assigned_by_id = current_user.id
       assigned.save!
 
+      topic.add_moderator_post(current_user,
+                               I18n.t('discourse_assign.assigned_to',
+                                       username: assign_to.username),
+                               { bump: false,
+                                 post_type: Post.types[:small_action],
+                                 action_code: "assigned"})
+
       render json: {status: "ok"}
     end