django-rest-form-fields

Extended form fields to validate REST-request data via django.forms.

Requirements

• Python 3.7+
  Other versions may also work but not tested automatically
• Django 2.2+
  Other versions may also work but not tested automatically
• typing
• jsonschema
  Optional. Required for validating json schema in JsonField and its child classes
• pytz
  Optional. Required for TimezoneField

Installation

Install via pip:
pip install django-rest-form-fields
or via setup.py:
python setup.py install

Usage

You can use standard django forms, adding new fields for them. All *args and **kwargs fields in reference below will be passed to base django constructors as is.

Example:

from django import forms
from django_rest_form_fields import FileField, ArrayField
    
class MyForm(forms.Form):
    file_field = FileField(max_size=1024, valid_extensions=['valid_extensions'])
    array_field = ArrayField(min_items=1, max_items=10)
            

Base forms

Since version 1.2.2 this library also contains base form classes. Together with library fields, they give ability to change field's source attribute. To have this feature, just inherit your class from BaseForm or BaseModelForm:

from django_rest_form_fields.forms import BaseForm
from django_rest_form_fields.fields import RestIntegerField


class MyForm(BaseForm):
    int_field = RestIntegerField(source='intField')
    
f = MyForm({'intField': 123})
f.full_clean()
print(f.cleaned_data['int_field'])
# Outputs: 123

Fields and their options

RestCharField(*args, source: Optional[str] = None, **kwargs)

Wraps django.forms.forms.CharField:

• Changes default value - None, not empty string
• Fixes initial value (CharField returns empty string, ignoring 'initial' parameter and None value)

Parameters:

• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

RegExField(*args, regex: Optional[str] = None, flags: int = 0, source: Optional[str] = None, **kwargs)

RestCharField child class, that automatically validates given string with regex (re.match function)
If regex parameter is specified and value matches expression, you can get MatchObject using field match attribute

Parameters:

• regex: str - regular expression string or compiled with re.compile() object
• flags: int - optional validate flags
• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

RestChoiceField(*args, choices: Optional[Iterable[Union[str, Tuple[str]]]] = None, source: Optional[str] = None, **kwargs)

Wraps django.forms.forms.ChoiceField:

• Changes default value - None, not empty string
• Fixes initial value (ChoiceField returns empty string, ignoring 'initial' parameter and None value)
• Gives opportunity to set 'choices' as iterable of values, not iterable of tuples

Parameters:

• choices: Optional[Iterable[Union[str, Tuple[str]]]] - values this field can have. It can be an iterable of strings or iterable of tuples[inner_name: str, human_name: str].
• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

RestIntegerField(*args, source: Optional[str] = None, **kwargs)

RestFloatField(*args, source: Optional[str] = None, **kwargs)

Wrap django.forms.forms.IntegerField and django.forms.forms.FloatField, fixing initial value (Base fields returns None, ignoring 'initial' parameter and None value)

Parameters:

• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[int/float]

PositiveIntegerField(*args, with_zero: bool = False, source: Optional[str] = None, **kwargs)

Child of RestIntegerField, validating value as positive integer.

Parameters:

• with_zero: bool - if False, 0 will cause validation error
• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[int]

IdField(*args, with_zero: bool = False, source: Optional[str] = None, **kwargs)

Child of PositiveIntegerField, validating integer id value. Upper value can be limited globally with ID_FIELD_MAX_VALUE in django.conf.settings.

Resulting value: Optional[int]

TimestampField(*args, in_future: bool = True, source: Optional[str] = None, **kwargs)

Child of RestFloatField. Gets timestamp value and converts it into datetime.datetime object in UTC. Parameter initial can be float or datetime.datetime value.
Parameters:

• in_future: bool - if False, datetime is validated to be less than django.utils.timezone.now()
• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[datetime.datetime]

DateTimeField(*args, mask: str = "%Y-%m-%dT%H:%M:%S", source: Optional[str] = None, **kwargs)

Child of RestCharField. Parses datetime string to datetime.datetime value. Parameters:

• mask: str - template for datetime.strptime function
• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[datetime.datetime]

MonthField(*args, mask: str = "%Y-%m", source: Optional[str] = None, **kwargs)

Child of DateTimeField. Parses month string to datetime.date value. Returns date of the first day of the month. Parameters:

• mask: str - template for datetime.strptime function
• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[datetime.date]

TimezoneField(*args, source: Optional[str] = None, **kwargs)

Child of RestCharField. Validates string as one of pytz timezone names.

Parameters:

• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

DateUnitField(*args, source: Optional[str] = None, **kwargs)

Child of RestChoiceField, validating value as one of [hour, day, week]

Parameters:

• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

RestBooleanField(*args, source: Optional[str] = None, **kwargs)

Standard django.forms.forms.BooleanField is based on /django/forms/widgets.py CheckboxInput.value_from_datadict(value) It works improperly for REST model: required=True + value=False => ValidationError This filed fixes this issue, giving opportunity to send False (required or not):

• None as default value
• 'false', '0', '' (ignoring case) as False
• Everything else is parsed with standard bool function

Parameters:

• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

LowerCaseEmailField(*args, source: Optional[str] = None, **kwargs)

Wraps django.forms.forms.EmailField:

• Converts email string to lowercase
• Fixes initial value bug (EmailField returns empty string, ignoring 'initial' parameter)
• Changes default value - None, not empty string

Parameters:

• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

ColorField(*args, source: Optional[str] = None, **kwargs)

Child of RestCharField, validating color. Color should be six hexadecimal characters.

Parameters:

• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

TruncatedCharField(*args, truncate_length: int = 255, source: Optional[str] = None, **kwargs)

Child of RestCharField, which truncates given value, leaving first truncate_length characters.

Parameters:

• truncate_length: Optional[int] - If None, acts as RestCharField. If integer - number of characters to leave.
• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

JsonField(*args, json_schema: Optional[dict], source: Optional[str] = None, **kwargs)

Child of RestCharField. Validates, that value is dict, list or JSON-encoded string. If string - decodes it.

Parameters:

• json_schema: Optional[dict] - Object to validate given JSON with jsonschema package.
• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[Any]

ArrayField(*args, min_items: int = 0, max_items: Optional[int] = None, item_schema: Optional[dict] = None, source: Optional[str] = None, **kwargs)

JsonField child. Validates array. It can be represented in 3 forms:

• list instance
• JSON-encoded array
• comma-separated string

Parameters:

• min_items: int - Validates array has more or equal items
• max_items: Optional[int] - Validates array has less or equal items
• item_schema: Optional[dict] - Object to validate every item with jsonschema package.
• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[List[Any]]

IdArrayField(*args, source: Optional[str] = None, **kwargs)

ArrayField child. Validates array of IdField().
Each array element is cleaned with IdField().

Parameters:

• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[List[int]]

IdSetField(*args, source: Optional[str] = None, **kwargs)

IdArrayField child. Validates set of IdField().
Each element is cleaned with IdField(). Removes duplicated ids from input, if needed.

Parameters:

• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[Set[int]]

UrlField(*args, with_underscore_domain: Optional[bool] = True, source: Optional[str] = None, **kwargs)

RegexField child. Validates string as URL with django.core.validators.URLValidator

Parameters:

• with_underscore_domain: Optional[bool] - allow domain with underscore character.
• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

HexField(*args, source: Optional[str] = None, **kwargs)

RestCharField child. Validates that string has hexadecimal characters only.

Parameters:

• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

UUIDField(*args, source: Optional[str] = None, **kwargs)

RegexField child. Validates field to be correct UUID.

Parameters:

• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[str]

FileField(*args, max_size: Optional[int] = None, valid_extensions: Optional[List[str]] = None, source: Optional[str] = None, **kwargs)

Wraps django.forms.forms.FileField:

• Fixes initial value bug (FileField returns empty string, ignoring 'initial' parameter)
• Adds validation parameters

Parameters:

• max_size: Optional[int] - File size in bytes
• valid_extensions: Optional[List[str]] - file extensions (without .), that are valid
• source: Optional[str] - name of attribute to get data from. Defaults to form attribute name.

Resulting value: Optional[file]

Running tests

Running in docker

1. Install docker and docker-compose
2. Run docker build . --tag django-rest-form-fields in project directory
3. Run docker-compose run run_tests in project directory

Running in virtual environment

1. Install python
2. Create virtual environment
3. Install pip requirements
   pip3 install -U -r requirements-test.txt
4. Start tests
   python3 runtests.py