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pythonsql-deletepeewee

Deleting multiple records in a table using join in Peewee?

Since joining is not allowed on "delete" queries in Peewee, what is the best way to delete all records in table_2 that match a specific condition in related table_1?

Using a simple example, I want to achieve the equivalent of this:

  DELETE message.*
  FROM message
  JOIN user ON message.from_user_id = user.id
  WHERE user.name = "Joe";
Solution

  • You should use subqueries for this type of thing, e.g.:

    joe = User.select().where(User.username == 'Joe')
Message.delete().where(Message.from_user == joe).execute()

    Let's say you want to delete all messages from "banned" users. You could write:

    banned_users = User.select().where(User.is_banned == True)
Message.delete().where(Message.user.in_(banned_users)).execute()