55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
from __future__ import unicode_literals
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from ast import literal_eval
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import logging
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from django.contrib.contenttypes import generic
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from django.contrib.contenttypes.models import ContentType
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from django.core.exceptions import ValidationError
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from django.core.urlresolvers import reverse
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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 .classes import BaseTransformation
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from .managers import TransformationManager
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logger = logging.getLogger(__name__)
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def argument_validator(value):
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"""
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Validates that the input evaluates correctly.
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"""
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value = value.strip()
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try:
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literal_eval(value)
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except (ValueError, SyntaxError):
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raise ValidationError(_('Enter a valid value.'), code='invalid')
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@python_2_unicode_compatible
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class Transformation(models.Model):
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"""
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Model that stores the transformation and transformation arguments
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for a given object
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"""
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content_type = models.ForeignKey(ContentType)
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object_id = models.PositiveIntegerField()
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content_object = generic.GenericForeignKey('content_type', 'object_id')
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order = models.PositiveIntegerField(default=0, blank=True, help_text=_('Order in which the transformations will be executed.'), null=True, verbose_name=_('Order'), db_index=True)
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name = models.CharField(choices=BaseTransformation.get_transformation_choices(), max_length=128, verbose_name=_('Name'))
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arguments = models.TextField(blank=True, help_text=_('Enter the arguments for the transformation as a Python dictionary. ie: {"degrees": 180}'), verbose_name=_('Arguments'), validators=[argument_validator])
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objects = TransformationManager()
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def __str__(self):
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return self.get_name_display()
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class Meta:
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ordering = ('order',)
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verbose_name = _('Transformation')
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verbose_name_plural = _('Transformations')
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