132 lines
4.5 KiB
Python
132 lines
4.5 KiB
Python
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"""Uploaded on https://code.djangoproject.com/ticket/25756 by Riccardo Di Virgilio"""
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from django import forms
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from django.contrib.postgres.fields import ArrayField
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from django.core.exceptions import ValidationError
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from django.db.models.fields.files import FieldFile, File
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class MultiFileInput(forms.FileInput):
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def render(self, name, value, attrs={}, renderer=None):
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attrs['multiple'] = 'multiple'
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return super().render(name, None, attrs=attrs)
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def value_from_datadict(self, data, files, name):
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if hasattr(files, 'getlist'):
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return files.getlist(name)
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else:
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return [files.get(name)]
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class MultiFileField(forms.FileField):
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widget = MultiFileInput
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default_error_messages = {
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'min_num': "Ensure at least %(min_num)s files are uploaded (received %(num_files)s).",
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'max_num': "Ensure at most %(max_num)s files are uploaded (received %(num_files)s).",
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'file_size': "File: %(uploaded_file_name)s, exceeded maximum upload size."
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}
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def __init__(self, *args, **kwargs):
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self.min_num = kwargs.pop('min_num', 0)
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self.max_num = kwargs.pop('max_num', None)
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self.maximum_file_size = kwargs.pop('maximum_file_size', None)
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super().__init__(*args, **kwargs)
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def to_python(self, data):
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ret = []
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for item in data:
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ret.append(super().to_python(item))
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return ret
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def validate(self, data):
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super().validate(data)
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num_files = len(data)
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if len(data) and not data[0]:
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num_files = 0
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if num_files < self.min_num:
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raise ValidationError(self.error_messages['min_num'] % {'min_num': self.min_num, 'num_files': num_files})
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elif self.max_num and num_files > self.max_num:
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raise ValidationError(self.error_messages['max_num'] % {'max_num': self.max_num, 'num_files': num_files})
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for uploaded_file in data:
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if self.maximum_file_size and uploaded_file.size > self.maximum_file_size:
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raise ValidationError(self.error_messages['file_size'] % {'uploaded_file_name': uploaded_file.name})
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def clean(self, data, initial=None):
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value = super().clean(data, initial=initial)
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# Do not overwrite, but append to initial
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if data and initial:
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value = initial + value
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return value
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def to_file_object(field, instance, file):
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if isinstance(file, str) or file is None:
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return field.attr_class(instance, field, file)
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elif isinstance(file, File) and not isinstance(file, FieldFile):
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file_copy = field.attr_class(instance, field, file.name)
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file_copy.file = file
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file_copy._committed = False
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return file_copy
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elif isinstance(file, FieldFile) and not hasattr(file, 'field'):
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file.instance = instance
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file.field = field
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file.storage = field.storage
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return file
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else:
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return file
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class ArrayFileDescriptor:
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def __init__(self, field):
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self.field = field
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def __get__(self, instance=None, owner=None):
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if instance is None:
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raise AttributeError(
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"The '%s' attribute can only be accessed from %s instances."
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% (self.field.name, owner.__name__))
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return [
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to_file_object(self.field.base_field, instance, file)
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for file in (instance.__dict__[self.field.name] or [])
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]
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def __set__(self, instance, value):
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instance.__dict__[self.field.name] = value
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class ArrayFileField(ArrayField):
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descriptor_class = ArrayFileDescriptor
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def set_attributes_from_name(self, name):
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super(ArrayField, self).set_attributes_from_name(name)
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self.base_field.set_attributes_from_name("%s_array" % name)
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def contribute_to_class(self, cls, name, **kwargs):
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super().contribute_to_class(cls, name, **kwargs)
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setattr(cls, self.name, self.descriptor_class(self))
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def pre_save(self, instance, add):
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"Returns field's value just before saving."
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files = [
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to_file_object(self.base_field, instance, file)
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for file in super(ArrayField, self).pre_save(instance, add)
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]
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for file_copy in files:
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if file_copy and not file_copy._committed:
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file_copy.save(file_copy.name, file_copy, save=False)
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return files
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def formfield(self, **kwargs):
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defaults = {
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'form_class': MultiFileField,
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'max_num': self.size
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}
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defaults.update(kwargs)
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return super(ArrayField, self).formfield(**defaults)
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