Note this is different from theĪs a custom field author, you don’t need to care about the first two values The full import path of the field class, the positional arguments (as a list),Īnd the keyword arguments (as a dict). HandField), you’ll need to supplement the values being passed.ĭeconstruct() returns a tuple of four items: the field’s attribute name, You’re changing the arguments passed in _init_() (like we are in Then there’s no need to write a new deconstruct() method. If you haven’t added any extra options on top of the field you inherited from, It’s used during model migrations to tell Django how to take an instance of your new fieldĪnd reduce it to a serialized form - in particular, what arguments to pass to The counterpoint to writing your _init_() method is writing theĭeconstruct() method. See the field documentation for examples and details. Meaning they do for normal Django fields. For advanced use only.Īll of the options without an explanation in the above list have the same You can usuallyĪutomatically created, as for the OneToOneField db_tablespace: Only for index creation, if theīackend supports tablespaces.serialize: If False, the field will not be serialized when the model.rel: Used for related fields (like ForeignKey).The Field._init_() method takes the following parameters: Use the more permissive behavior of the current fields. You want your fields to be more strict about the options they select, or to The parent class and then don’t use them later on. This behavior simplifies the field classes, because they don’t need toĬheck for options that aren’t necessary. Many of Django’s model fields accept options that they don’t do anythingĭjango.db.models.DateField and it will ignore theĮditable=False). How to convert your first class back and forth between its permanent The second class is the Field subclass. They will assign it to the model attribute, they will read from it forĭisplaying purposes, things like that.
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