Writing ForeignKey under models class in Django 2.0
book = ('BookInfo')
django 2.0 differs from its predecessor, 1.8.
Error:
book = ('BookInfo')
TypeError: __init__() missing 1 required positional argument: 'on_delete'
Solution:
book = ('BookInfo', on_delete=,)
Add the on_delete parameter and you're good to go!!!!
Additional knowledge:Django ForeignKey ondelete
CASCADE: Deletes all the information under the associated table;
PROTECT: When deleting information, a protection mechanism is adopted to throw an error: i.e., the contents of the associated table are not deleted;
SET_NULL: Null the association only if null=True;
SET_DEFAULT: Set to the default value;
SET( ): the parentheses can be functions, set to something you define;
DO_NOTHING: Literally, don't do anything, you're deleting what you're deleting, it doesn't matter to me.
Above this perfect solution to Django2.0 in models under the ForeignKey () problem is all I have shared with you, I hope to give you a reference, and I hope you support me more.