Question

I have a junction table | USER_ID | ORDER_ID |
now, when I’m trying to delete a row in the table I’m getting
does not have a single-column primary key error.

Now of course both of the table’s columns are FK, and I can’t add a PK column in it because it’s a junction table.

I’m using :

userJoinOrdersDao.delete(userOrderObj);

Does anyone see my mistake?

Answer 1

The junction table’s primary key consists of both columns. This is not supported by greenDAO.

http://greendao-orm.com/documentation/relations/ says:

While greenDAO does not support n:m relations directly as of now, you can model the join table as a separate entity.

… which would require a separate PK column.

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Does an order really need to have multiple users?