✨(global) allow user to send internal message through ThreadEvent (#566)

When a Thread has several accesses or is linked to a shared mailbox,
an input allows to post internal messages. It also allows to
mention user in a message. The ThreadEvent model
is the foundation to enrich Threads with further kind of event.

Co-authored-by: Sylvain Zimmer <sylvinus@users.noreply.github.com>

Author: sylvinus

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -18,7 +18,7 @@ A clear and concise description of what you expected to happen (or code).
 3. And then the bug happens!
 
 **Environment**
-- Drive version:
+- Message version:
 - Platform:
 
 **Possible Solution**

Makefile

@@ -393,9 +393,10 @@ showmigrations: ## show all migrations for the messages project.
 	@$(MANAGE_DB) showmigrations
 .PHONY: showmigrations
 
-superuser: ## Create an admin superuser with password "admin"
+superuser: ## Create an admin superuser with password "admin" and promote user1 as superuser
 	@echo "$(BOLD)Creating a Django superuser$(RESET)"
 	@$(MANAGE_DB) createsuperuser --email admin@admin.local --password admin
+	@$(MANAGE_DB) createsuperuser --email user1@example.local --password user1
 .PHONY: superuser
 
 shell-back: ## open a shell in the backend container

src/backend/core/admin.py

@@ -422,11 +422,21 @@ class ThreadAccessInline(admin.TabularInline):
     readonly_fields = ("read_at", "starred_at")
 
 
+class ThreadEventInline(admin.TabularInline):
+    """Inline class for the ThreadEvent model"""
+
+    model = models.ThreadEvent
+    autocomplete_fields = ("author", "channel")
+    raw_id_fields = ("message",)
+    readonly_fields = ("created_at",)
+    extra = 0
+
+
 @admin.register(models.Thread)
 class ThreadAdmin(admin.ModelAdmin):
     """Admin class for the Thread model"""
 
-    inlines = [ThreadAccessInline]
+    inlines = [ThreadAccessInline, ThreadEventInline]
     list_display = (
         "id",
         "subject",