Replaced the combined localized data models into flexible, separated localized data models and their accompanying localization data models, so that adding new languages works automatically without having to change the data model definitions.

accounting/models.py

@@ -28,24 +28,24 @@ from django.db import models, transaction
 from django.db.models import Q, Max
 from django.http import HttpRequest
 
-from mia_core.models import BaseModel
-from mia_core.utils import get_multi_lingual_attr, set_multi_lingual_attr
+from mia_core.models import BaseModel, L10nModel, LocalizedModel
 
 
-class Account(DirtyFieldsMixin, BaseModel):
+class Account(DirtyFieldsMixin, LocalizedModel, BaseModel):
     """An account."""
     parent = models.ForeignKey(
         "self", on_delete=models.PROTECT, null=True,
         related_name="child_set")
     code = models.CharField(max_length=5, unique=True)
-    title_zh_hant = models.CharField(max_length=32)
-    title_en = models.CharField(max_length=128, null=True)
-    title_zh_hans = models.CharField(max_length=32, null=True)
+    title_l10n = models.CharField(max_length=32, db_column="title")
     CASH = "1111"
     ACCUMULATED_BALANCE = "3351"
     NET_CHANGE = "3353"
 
     def __init__(self, *args, **kwargs):
+        if "title" in kwargs:
+            self.title = kwargs["title"]
+            del kwargs["title"]
         super().__init__(*args, **kwargs)
         self.url = None
         self.debit_amount = None
@@ -69,12 +69,11 @@ class Account(DirtyFieldsMixin, BaseModel):
 
     @property
     def title(self) -> str:
-        """The title in the current language."""
-        return get_multi_lingual_attr(self, "title")
+        return self.get_l10n("title")
 
     @title.setter
-    def title(self, value: str) -> None:
-        set_multi_lingual_attr(self, "title", value)
+    def title(self, value):
+        self.set_l10n("title", value)
 
     @property
     def option_data(self) -> Dict[str, str]:
@@ -109,6 +108,12 @@ class Account(DirtyFieldsMixin, BaseModel):
         self._is_in_use = value
 
 
+class AccountL10n(DirtyFieldsMixin, L10nModel, BaseModel):
+    """The localization content of an account."""
+    master = models.ForeignKey(
+        Account, on_delete=models.CASCADE, related_name="l10n_set")
+
+
 class Transaction(DirtyFieldsMixin, BaseModel):
     """An accounting transaction."""
     date = models.DateField()