Added saving current user while saving

docs/current_user.rst

@@ -1,2 +1,31 @@
 How to associate model with current user while saving?
-++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+The :code:`Hero` model has the following field.::
+
+    added_by = models.ForeignKey(settings.AUTH_USER_MODEL,
+            null=True, blank=True, on_delete=models.SET_NULL)
+
+
+You want the :code:`added_by` field to be automatically set to current user whenever object is created from admin. You can do this.::
+
+    def save_model(self, request, obj, form, change):
+        if not obj.pk:
+            # Only set added_by during the first save.
+            obj.added_by = request.user
+        super().save_model(request, obj, form, change)
+
+If instead you wanted to always save the current user, you can do.::
+
+    def save_model(self, request, obj, form, change):
+        obj.added_by = request.user
+        super().save_model(request, obj, form, change)
+
+If you also want to hide the :code:`added_by` field to not show up on the change form, you can do.::
+
+
+    @admin.register(Hero)
+    class HeroAdmin(admin.ModelAdmin, ExportCsvMixin):
+        ...
+        exclude = ['added_by',]
+

heroes_and_monsters/entities/admin.py

@@ -53,7 +53,14 @@ class HeroAdmin(admin.ModelAdmin, ExportCsvMixin):
     list_filter = ("is_immortal", "category", "origin", IsVeryBenevolentFilter)
     actions = ["mark_immortal"]
 
-    list_per_page = sys.maxsize
+    exclude = ['added_by',]
+
+    def save_model(self, request, obj, form, change):
+        if not obj.pk:
+            # Only set added_by during the first save.
+            obj.added_by = request.user
+        super().save_model(request, obj, form, change)
+
 
     def mark_immortal(self, request, queryset):
         queryset.update(is_immortal=True)

heroes_and_monsters/entities/models.py

@@ -1,5 +1,7 @@
 from django.db import models
 
+from django.conf import settings
+
 
 class Category(models.Model):
     name = models.CharField(max_length=100)
@@ -41,6 +43,10 @@ class Entity(models.Model):
     )
     description = models.TextField()
 
+    added_by = models.ForeignKey(settings.AUTH_USER_MODEL,
+        null=True, blank=True, on_delete=models.SET_NULL)
+    added_on = models.DateField(auto_now=True)
+
     def __str__(self):
         return self.name