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What does ForeignKeyField means and looks like in the database system?
When do we use ForeignKeyField?
import datetime from peewee import * DATABASE = SqliteDatabase('recipes.db') class Recipe(Model): name = CharField() created_at = DateTimeField(default=datetime.datetime.now) class Meta: database = DATABASE # TODO: Ingredient model # name - string (e.g. "carrots") # description - string (e.g. "chopped") # quantity - decimal (e.g. ".25") # measurement_type - string (e.g. "cups") # recipe - foreign key class Ingredient(Model): name = CharField() description = CharField() quantity = DecimalField() measurement_type = CharField() recipe = ForeignKeyField(Recipe) # relationship to another model class Meta: database = DATABASE
from flask.ext.restful import Resource import models
Mel RumseyTreehouse Staff
Hi Hanwen Zhang! A foreign key is a reference point from one table to another within a database. I suggest going through the SQL courses so that you can understand how database relationships work. Here is a video from the Querying Relational Databases course that explains Foreign Keys which also has some great visual examples. I highly recommend going through the whole course though. It helps explain databases and how they work.
Hope this helps!