130 lines
4.1 KiB
Python
130 lines
4.1 KiB
Python
from __future__ import unicode_literals
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from django.core.exceptions import ValidationError
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from django.db import models
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from django.utils.encoding import python_2_unicode_compatible
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from django.utils.translation import ugettext_lazy as _
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from documents.models import Document, DocumentType
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from .managers import MetadataTypeManager
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from .settings import setting_available_validators
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def validation_choices():
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return zip(
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setting_available_validators.value,
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setting_available_validators.value
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)
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@python_2_unicode_compatible
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class MetadataType(models.Model):
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"""
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Define a type of metadata
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"""
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name = models.CharField(
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max_length=48,
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help_text=_(
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'Name used by other apps to reference this value. '
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'Do not use python reserved words, or spaces.'
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),
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unique=True, verbose_name=_('Name')
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)
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label = models.CharField(max_length=48, verbose_name=_('Label'))
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default = models.CharField(
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blank=True, max_length=128, null=True,
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help_text=_(
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'Enter a template to render. '
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'Use Django\'s default templating language '
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'(https://docs.djangoproject.com/en/1.7/ref/templates/builtins/)'
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),
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verbose_name=_('Default')
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)
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lookup = models.TextField(
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blank=True, null=True,
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help_text=_(
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'Enter a template to render. '
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'Must result in a command delimited string. '
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'Use Django\'s default templating language '
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'(https://docs.djangoproject.com/en/1.7/ref/templates/builtins/).'
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),
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verbose_name=_('Lookup')
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)
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validation = models.CharField(
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blank=True, choices=validation_choices(), max_length=64,
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verbose_name=_('Validation function name')
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)
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objects = MetadataTypeManager()
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def __str__(self):
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return self.label
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def natural_key(self):
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return (self.name,)
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class Meta:
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ordering = ('label',)
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verbose_name = _('Metadata type')
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verbose_name_plural = _('Metadata types')
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@python_2_unicode_compatible
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class DocumentMetadata(models.Model):
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"""
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Link a document to a specific instance of a metadata type with it's
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current value
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"""
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document = models.ForeignKey(
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Document, related_name='metadata', verbose_name=_('Document')
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)
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metadata_type = models.ForeignKey(MetadataType, verbose_name=_('Type'))
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value = models.CharField(
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blank=True, db_index=True, max_length=255, null=True,
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verbose_name=_('Value')
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)
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def __str__(self):
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return unicode(self.metadata_type)
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def save(self, *args, **kwargs):
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if self.metadata_type.pk not in self.document.document_type.metadata.values_list('metadata_type', flat=True):
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raise ValidationError(
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_('Metadata type is not valid for this document type.')
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)
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return super(DocumentMetadata, self).save(*args, **kwargs)
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def delete(self, enforce_required=True, *args, **kwargs):
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if enforce_required and self.metadata_type.pk in self.document.document_type.metadata.filter(required=True).values_list('metadata_type', flat=True):
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raise ValidationError(
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_('Metadata type is required for this document type.')
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)
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return super(DocumentMetadata, self).delete(*args, **kwargs)
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class Meta:
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unique_together = ('document', 'metadata_type')
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verbose_name = _('Document metadata')
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verbose_name_plural = _('Document metadata')
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@python_2_unicode_compatible
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class DocumentTypeMetadataType(models.Model):
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document_type = models.ForeignKey(
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DocumentType, related_name='metadata',
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verbose_name=_('Document type')
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)
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metadata_type = models.ForeignKey(
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MetadataType, verbose_name=_('Metadata type')
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)
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required = models.BooleanField(default=False, verbose_name=_('Required'))
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def __str__(self):
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return unicode(self.metadata_type)
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class Meta:
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unique_together = ('document_type', 'metadata_type')
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verbose_name = _('Document type metadata type options')
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verbose_name_plural = _('Document type metadata types options')
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