models: Add Note model

Signed-off-by: andrepapoti <[email protected]>

Author: andrepapoti

patchwork/models.py

@@ -33,6 +33,14 @@ def validate_regex_compiles(regex_string):
         raise ValidationError('Invalid regular expression entered!')
 
 
+class TimestampMixin(models.Model):
+    created_at = models.DateTimeField(default=tz_utils.now)
+    updated_at = models.DateTimeField(default=tz_utils.now)
+
+    def update_timestamp(self):
+        self.updated_at = tz_utils.now().isoformat()
+
+
 class Person(models.Model):
     # properties
 
@@ -823,6 +831,29 @@ class Meta:
         ]
 
 
+class Note(TimestampMixin, models.Model):
+    patch = models.ForeignKey(
+        Patch,
+        related_name='note',
+        related_query_name='note',
+        on_delete=models.CASCADE,
+    )
+    submitter = models.ForeignKey(User, on_delete=models.CASCADE)
+    content = models.TextField(null=False, blank=True)
+    maintainer_only = models.BooleanField(default=True)
+    __original_content = None
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.__original_content = self.content
+
+    def save(self, *args, **kwargs):
+        if self.content != self.__original_content:
+            self.update_timestamp()
+            self.__original_content = self.content
+        super().save(*args, **kwargs)
+
+
 class Series(FilenameMixin, models.Model):
     """A collection of patches."""