feat: statement api for business module

business/admin.py

@@ -203,11 +203,23 @@ class SupplierBalanceAdmin(admin.ModelAdmin):
 
 @admin.register(models.BalanceChangeRecord)
 class BalanceChangeRecordAdmin(admin.ModelAdmin):
-    list_display = ('id', 'merchant', 'target_type', 'source_type', 'source_id', 'delta', 'balance_before', 'balance_after', 'direction', 'created_at')
+    list_display = (
+        'id', 'merchant', 'target_type', 'target',
+        'source_type', 'source_id', 'delta', 
+        'balance_before', 'balance_after', 
+        'direction', 'created_at',
+        )
     search_fields = ('merchant__name', 'target_type', 'source_type', 'source_id')
     list_filter = ('merchant', 'target_type', 'source_type', 'direction', 'created_at')
     ordering = ('-created_at',)
 
+    @admin.display(description='供应商/客户')
+    def target(self, obj: models.BalanceChangeRecord):
+        if obj.target_type == models.BalanceChangeTargetEnum.SUPPLIER:
+            return obj.supplier.name
+        elif obj.target_type == models.BalanceChangeTargetEnum.CUSTOMER:
+            return obj.customer.name
+        return '-'
     @admin.display(description='商户')
     def merchant(self, obj: models.BalanceChangeRecord):
         return obj.merchant.name