How to solve NOT NULL constraint failed in Django?

Solution: Go to the migrations folder and delete manually files that have 000*_lastAction_blah-blah type of name, you can delete, probably all, but 0001_initial.py file. After that run ./manage.py make migrations app_you_are_updateing, it should update your database.

What does NOT NULL mean in SQLite?

In SQLite, Not Null Constraint is used to indicates that the column will not allow storing NULL values. Generally, in SQLite by default columns will allow NULL values in case if you have requirement like not to allow NULL values in column means then we need to add NOT NULL constraint on column.

Does NOT NULL require default?

“Standard” SQL specifies the following rules: For each row in table, a column can contain a value or NULL which indicates “no value.” If a column is declared NOT NULL, it must always contain a non-NULL value; NULL is not allowed. Columns can have a default value.

What is IntegrityError in Django?

IntegrityError is a class within the django. db module of the Django project.

Is it possible to create a NULL constraint in SQL?

In otherwords is it possible to create a constraint such that a column B can be null as long column A contains lets say ‘NEW’ but if the contents of column A changes to something else then column B is no longer allowed to be null?

Is there a way to make conditional constraints in SQL?

There’s not a way to make conditional constraints. You should, however be able to do the job using a trigger. That’s what they’re for. Note that in the query you’ll want to reference inserted which is a special object that behaves like a table, and lets you reference the row (s) that caused the trigger.

Why is my NOT NULL constraint failing in Django?

My problem is I keep running into this NOT NULL constraint failed with the user id error. I believe this comes from having a null user when the form is trying to save, but don’t know what I could do to fix it.

What does it mean if C # failed to enable constraints?

Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints. I know the problem, but I don’t know how to fix it. The second table I make the outer join on contains a composite primary key which are null in the previous outer join query.