表單中的多選字段在重置數據庫時拋出異常

Question

重置我的數據庫時遇到了一個奇怪的問題。如果我下面一段在forms.py代碼註釋的形式選擇題場拋出異常

 
     Unhandled exception in thread started by .wrapper at 0x7f59df160510> 
    Traceback (most recent call last): 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/db/backends/utils.py", line 64, in execute 
     return self.cursor.execute(sql, params) 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/db/backends/sqlite3/base.py", line 337, in execute 
     return Database.Cursor.execute(self, query, params) 
    sqlite3.OperationalError: no such table: app1_semester 

    The above exception was the direct cause of the following exception: 

    Traceback (most recent call last): 
    ...... 

     File "/home/abdullah/PycharmProjects/langs-dept/project1/app1/urls.py", line 3, in 
     from . import views 
     File "/home/abdullah/PycharmProjects/langs-dept/project1/app1/views.py", line 10, in 
     from . import models, forms 
     File "/home/abdullah/PycharmProjects/langs-dept/project1/app1/forms.py", line 11, in 
     class AddAssignmentForm(forms.Form): 
     File "/home/abdullah/PycharmProjects/langs-dept/project1/app1/forms.py", line 14, in AddAssignmentForm 
     queryset=models.AssignmentType.get_assignment_types(), 
     File "/home/abdullah/PycharmProjects/langs-dept/project1/app1/models.py", line 180, in get_assignment_types 
     return AssignmentType.objects.filter(semester=Semester.get_current_semester()) 
     File "/home/abdullah/PycharmProjects/langs-dept/project1/app1/models.py", line 157, in get_current_semester 
     return semester.first() if semester else None 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/db/models/query.py", line 260, in __bool__ 
     self._fetch_all() 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/db/models/query.py", line 1087, in _fetch_all 
     self._result_cache = list(self.iterator()) 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/db/models/query.py", line 54, in __iter__ 
     results = compiler.execute_sql() 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/db/models/sql/compiler.py", line 835, in execute_sql 
     cursor.execute(sql, params) 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/db/backends/utils.py", line 79, in execute 
     return super(CursorDebugWrapper, self).execute(sql, params) 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/db/backends/utils.py", line 64, in execute 
     return self.cursor.execute(sql, params) 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/db/utils.py", line 94, in __exit__ 
     six.reraise(dj_exc_type, dj_exc_value, traceback) 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/utils/six.py", line 685, in reraise 
     raise value.with_traceback(tb) 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/db/backends/utils.py", line 64, in execute 
     return self.cursor.execute(sql, params) 
     File "/home/abdullah/PycharmVirtualEnvs/venv/lib/python3.5/site-packages/django/db/backends/sqlite3/base.py", line 337, in execute 
     return Database.Cursor.execute(self, query, params) 
    django.db.utils.OperationalError: no such table: app1_semester 

，一切工作正常。

class AddAssignmentForm(forms.Form): 
     assignments = forms.ModelMultipleChoiceField(widget=forms.CheckboxSelectMultiple(),queryset=models.AssignmentType.get_assignment_types(),required=False) 

的方法get_assignment_types（）是一個靜態方法返回值

models.py

@staticmethod 
    def get_assignment_types(): 
     return AssignmentType.objects.filter() 

我可以評論該行並做蟒蛇manage.py makemigrations的一些名單，但我想知道什麼是錯的？有人可以點亮一些光線嗎？

Answer 1

錯誤是在這一行

AssignmentType.objects.filter(semester=Semester.get_current_semester()) 

你必須爲模型做適當的遷移Semester