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109 lines
3.4 KiB
Python
109 lines
3.4 KiB
Python
import re
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from django.db import models
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from django.core.exceptions import ValidationError
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from django.utils.translation import gettext_lazy as _
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from .forms import CSVFormField
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class EavSlugField(models.SlugField):
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"""
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The slug field used by :class:`~eav.models.Attribute`
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"""
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def validate(self, value, instance):
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"""
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Slugs are used to convert the Python attribute name to a database
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lookup and vice versa. We need it to be a valid Python identifier. We
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don't want it to start with a '_', underscore will be used in
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variables we don't want to be saved in the database.
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"""
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super(EavSlugField, self).validate(value, instance)
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slug_regex = r'[a-z][a-z0-9_]*'
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if not re.match(slug_regex, value):
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raise ValidationError(_(
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'Must be all lower case, start with a letter, and contain '
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'only letters, numbers, or underscores.'
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))
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@staticmethod
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def create_slug_from_name(name):
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"""Creates a slug based on the name."""
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name = name.strip().lower()
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# Change spaces to underscores.
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name = '_'.join(name.split())
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# Remove non alphanumeric characters.
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return re.sub('[^\w]', '', name)
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class EavDatatypeField(models.CharField):
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"""
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The datatype field used by :class:`~eav.models.Attribute`.
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"""
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def validate(self, value, instance):
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"""
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Raise ``ValidationError`` if they try to change the datatype of an
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:class:`~eav.models.Attribute` that is already used by
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:class:`~eav.models.Value` objects.
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"""
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super(EavDatatypeField, self).validate(value, instance)
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if not instance.pk:
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return
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if type(instance).objects.get(pk=instance.pk).datatype == instance.datatype:
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return
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if instance.value_set.count():
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raise ValidationError(_(
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'You cannot change the datatype of an attribute that is already in use.'
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))
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class CSVField(models.TextField): # (models.Field):
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description = _("A Comma-Separated-Value field.")
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default_separator = ";"
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def __init__(self, separator=";", *args, **kwargs):
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self.separator = separator
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kwargs.setdefault('default', "")
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super().__init__(*args, **kwargs)
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def deconstruct(self):
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name, path, args, kwargs = super().deconstruct()
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if self.separator != self.default_separator:
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kwargs['separator'] = self.separator
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return name, path, args, kwargs
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def formfield(self, **kwargs):
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defaults = {'form_class': CSVFormField}
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defaults.update(kwargs)
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return super().formfield(**defaults)
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def from_db_value(self, value, expression, connection, context=None):
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if value is None:
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return []
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return value.split(self.separator)
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def to_python(self, value):
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if value is None:
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return []
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if isinstance(value, list):
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return value
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return value.split(self.separator)
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def get_prep_value(self, value):
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if not value:
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return ""
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if isinstance(value, str):
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return value
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elif isinstance(value, list):
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return self.separator.join(value)
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def value_to_string(self, obj):
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value = self.value_from_object(obj)
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return self.get_prep_value(value)
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