categories.fields.CategoryFKField

CategoryFKField

class categories.fields.CategoryFKField(**kwargs)

A foreign key to the Category model.

Methods

cast_db_type(connection)	Return the data type to use in the Cast() function.
check(**kwargs)
clean(value, model_instance)	Convert the value's type and run validation.
clone()	Uses deconstruct() to clone a new copy of this Field.
contribute_to_class(cls, name[, private_only])	Register the field with the model class it belongs to.
contribute_to_related_class(cls, related)
convert_empty_strings(value, expression, ...)
db_check(connection)	Return the database column check constraint for this field, for the provided connection.
db_parameters(connection)	Extension of db_type(), providing a range of different return values (type, checks).
db_type(connection)	Return the database column data type for this field, for the provided connection.
db_type_parameters(connection)
db_type_suffix(connection)
deconstruct()	Return enough information to recreate the field as a 4-tuple:
delete_cached_value(instance)
do_related_class(other, cls)
formfield(*[, using])	Pass limit_choices_to to the field being constructed.
get_attname()
get_attname_column()
get_cache_name()
get_cached_value(instance[, default])
get_choices([include_blank, blank_choice, ...])	Return choices with a default blank choices included, for use as <select> choices for this field.
get_col(alias[, output_field])
get_db_converters(connection)
get_db_prep_save(value, connection)	Return field's value prepared for saving into a database.
get_db_prep_value(value, connection[, prepared])	Return field's value prepared for interacting with the database backend.
get_default()	Return the to_field if the default value is an object.
get_extra_descriptor_filter(instance)	Return an extra filter condition for related object fetching when user does 'instance.fieldname', that is the extra filter is used in the descriptor of the field.
get_extra_restriction(where_class, alias, ...)	Return a pair condition used for joining and subquery pushdown.
get_filter_kwargs_for_object(obj)	Return a dict that when passed as kwargs to self.model.filter(), would yield all instances having the same value for this field as obj has.
get_foreign_related_value(instance)
get_forward_related_filter(obj)	Return the keyword arguments that when supplied to self.model.object.filter(), would select all instances related through this field to the remote obj.
get_instance_value_for_fields(instance, fields)
get_internal_type()
get_joining_columns([reverse_join])
get_limit_choices_to()	Return limit_choices_to for this model field.
get_local_related_value(instance)
get_lookup(lookup_name)
get_lookups()
get_path_info([filtered_relation])	Get path from this field to the related model.
get_pk_value_on_save(instance)	Hook to generate new PK values on save.
get_prep_value(value)	Perform preliminary non-db specific value checks and conversions.
get_reverse_joining_columns()
get_reverse_path_info([filtered_relation])	Get path from the related model to this field's model.
get_reverse_related_filter(obj)	Complement to get_forward_related_filter().
get_transform(lookup_name)
has_default()	Return a boolean of whether this field has a default value.
is_cached(instance)
merge_dicts(dicts)	Merge dicts in reverse to preference the order of the original list.
pre_save(model_instance, add)	Return field's value just before saving.
register_lookup(lookup[, lookup_name])
rel_db_type(connection)	Return the data type that a related field pointing to this field should use.
related_query_name()	Define the name that can be used to identify this related object in a table-spanning query.
resolve_related_fields()
run_validators(value)
save_form_data(instance, data)
select_format(compiler, sql, params)	Custom format for select clauses.
set_attributes_from_name(name)
set_attributes_from_rel()
set_cached_value(instance, value)
to_python(value)	Convert the input value into the expected Python data type, raising django.core.exceptions.ValidationError if the data can't be converted.
validate(value, model_instance)	Validate value and raise ValidationError if necessary.
value_from_object(obj)	Return the value of this field in the given model instance.
value_to_string(obj)	Return a string value of this field from the passed obj.

Attributes

auto_creation_counter
cached_col
class_lookups
creation_counter
db_returning	Private API intended only to be used by Django itself.
db_tablespace
default_error_messages
default_validators
description
empty_strings_allowed
empty_values
flatchoices	Flattened version of choices tuple.
foreign_related_fields
hidden
local_related_fields
many_to_many
many_to_one
one_to_many
one_to_one
related_fields
related_model
requires_unique_target
reverse_related_fields
swappable_setting	Get the setting that this is powered from for swapping, or None if it's not swapped in / marked with swappable=False.
system_check_deprecated_details
system_check_removed_details
target_field	When filtering against this relation, return the field on the remote model against which the filtering should happen.
unique
validators	Some validators can't be created at field initialization time.