lamindb.base.fields.DurationField

class lamindb.base.fields.DurationField(*args, **kwargs)

Bases: DurationField

Custom DurationField with default values for blank.

Django default values for DurationField are blank=False.

Attributes

auto_creation_counter = -59

property choices

class_lookups = {'contains': <class 'django.db.models.lookups.Contains'>, 'endswith': <class 'django.db.models.lookups.EndsWith'>, 'exact': <class 'django.db.models.lookups.Exact'>, 'gt': <class 'django.db.models.lookups.GreaterThan'>, 'gte': <class 'django.db.models.lookups.GreaterThanOrEqual'>, 'icontains': <class 'django.db.models.lookups.IContains'>, 'iendswith': <class 'django.db.models.lookups.IEndsWith'>, 'iexact': <class 'django.db.models.lookups.IExact'>, 'in': <class 'django.db.models.lookups.In'>, 'iregex': <class 'django.db.models.lookups.IRegex'>, 'isnull': <class 'django.db.models.lookups.IsNull'>, 'istartswith': <class 'django.db.models.lookups.IStartsWith'>, 'lt': <class 'django.db.models.lookups.LessThan'>, 'lte': <class 'django.db.models.lookups.LessThanOrEqual'>, 'range': <class 'django.db.models.lookups.Range'>, 'regex': <class 'django.db.models.lookups.Regex'>, 'startswith': <class 'django.db.models.lookups.StartsWith'>}

creation_counter = 964

property db_returning

Private API intended only to be used by Django itself.

property db_tablespace

default_error_messages = {'invalid': '“%(value)s” value has an invalid format. It must be in [DD] [[HH:]MM:]ss[.uuuuuu] format.'}

default_validators = []

description = 'Duration'

descriptor_class = <class 'django.db.models.query_utils.DeferredAttribute'>

empty_strings_allowed = False

empty_values = [None, '', [], (), {}]

property flatchoices

Flattened version of choices tuple.

generated = False

get_lookups = functools.partial(<functools._lru_cache_wrapper object>, <class 'lamindb.base.fields.DurationField'>)

hidden = False

many_to_many = None

many_to_one = None

non_db_attrs = ('blank', 'choices', 'db_column', 'editable', 'error_messages', 'help_text', 'limit_choices_to', 'on_delete', 'related_name', 'related_query_name', 'validators', 'verbose_name')

one_to_many = None

one_to_one = None

register_lookup = functools.partial(<function RegisterLookupMixin.register_class_lookup>, <class 'lamindb.base.fields.DurationField'>)

related_model = None

system_check_deprecated_details = None

system_check_removed_details = None

Class methods

classmethod get_class_lookups()

classmethod register_class_lookup(lookup, lookup_name=None)

Methods

cast_db_type(connection)

Return the data type to use in the Cast() function.

check(**kwargs)

clone()

Uses deconstruct() to clone a new copy of this Field. Will not preserve any class attachments/attribute names.

contribute_to_class(cls, name, private_only=False)

Register the field with the model class it belongs to.

If private_only is True, create a separate instance of this field for every subclass of cls, even if cls is not an abstract model.

db_check(connection)

Return the database column check constraint for this field, for the provided connection. Works the same way as db_type() for the case that get_internal_type() does not map to a preexisting model field.

db_parameters(connection)

Extension of db_type(), providing a range of different return values (type, checks). This will look at db_type(), allowing custom model fields to override it.

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:

• The name of the field on the model, if contribute_to_class() has been run.

• The import path of the field, including the class, e.g. django.db.models.IntegerField. This should be the most portable version, so less specific may be better.

• A list of positional arguments.

• A dict of keyword arguments.

Note that the positional or keyword arguments must contain values of the following types (including inner values of collection types):

• None, bool, str, int, float, complex, set, frozenset, list, tuple, dict

• UUID

• datetime.datetime (naive), datetime.date

• top-level classes, top-level functions - will be referenced by their full import path

• Storage instances - these have their own deconstruct() method

This is because the values here must be serialized into a text format (possibly new Python code, possibly JSON) and these are the only types with encoding handlers defined.

There’s no need to return the exact way the field was instantiated this time, just ensure that the resulting field is the same - prefer keyword arguments over positional ones, and omit parameters with their default values.

formfield(**kwargs)

get_attname()

get_attname_column()

get_choices(include_blank=True, blank_choice=[('', '---------')], limit_choices_to=None, ordering=())

Return choices with a default blank choices included, for use as <select> choices for this field.

get_col(alias, output_field=None)

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=False)

get_default()

Return the default value for this field.

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_instance_lookups()

get_internal_type()

get_lookup(lookup_name)

get_pk_value_on_save(instance)

Hook to generate new PK values on save. This method is called when saving instances with no primary key value set. If this method returns something else than None, then the returned value is used when saving the new instance.

get_prep_value(value)

Perform preliminary non-db specific value checks and conversions.

get_transform(lookup_name)

has_default()

Return a boolean of whether this field has a default value.

pre_save(model_instance, add)

Return field’s value just before saving.

register_instance_lookup(lookup, lookup_name=None)

rel_db_type(connection)

Return the data type that a related field pointing to this field should use. For example, this method is called by ForeignKey and OneToOneField to determine its data type.

run_validators(value)

save_form_data(instance, data)

select_format(compiler, sql, params)

Custom format for select clauses. For example, GIS columns need to be selected as AsText(table.col) on MySQL as the table.col data can’t be used by Django.

set_attributes_from_name(name)

slice_expression(expression, start, length)

Return a slice of this field.

to_python(value)

validate(value, model_instance)

Validate value and raise ValidationError if necessary. Subclasses should override this to provide validation logic.

value_from_object(obj)

Return the value of this field in the given model instance.

value_to_string(obj)