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fields.py
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fields.py
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# -*- coding: utf-8 -*-
from __future__ import unicode_literals, absolute_import
from importlib import import_module
from django.db import models
from django.core.exceptions import ValidationError
from django.utils.six import string_types
from django.utils.module_loading import import_string
from django.conf import settings
from dashboards.forms.fields import DashboardTypeChoiceField
from dashboards.dashboards import DashboardProvider
def classpath(klass):
return '{}.{}'.format(
klass.__module__, klass.__name__)
class DashboardProviderChoiceField(models.Field):
"""Custom model field to select a `DashboardProvider` subclass."""
description = "Field to select a DashboardProvider subclass."
def get_internal_type(self):
return "CharField"
def __init__(self, *args, **kwargs):
kwargs['max_length'] = kwargs.get('max_length', 250)
super(DashboardProviderChoiceField, self).__init__(*args, **kwargs)
self._choices = None
def _get_choices(self, *args, **kwargs):
if self._choices is None:
self._choices = self._get_all_dashboard_providers()
return self._choices
choices = property(_get_choices)
def _get_all_dashboard_providers(self):
"""Return the list of all available dashboard providers.
Copied from django admin's autodiscover.
"""
from dashboards.dashboards import DashboardProvider
for app in settings.INSTALLED_APPS:
try:
import_module('{}.dashboards'.format(app))
except:
pass
providers = []
for subclass in DashboardProvider.__subclasses__():
providers.append((
subclass,
subclass.__name__
))
return providers
def from_db_value(self, value, expression, connection, context):
return self.to_python(value)
def to_python(self, value):
"""Converts the stored string to a python type."""
if value == '' or value is None:
return None
if isinstance(value, string_types):
try:
value = import_string(value)
except:
raise ValidationError('The class {} does not exist'.format(
value))
if not isinstance(value, type):
raise ValidationError('This should be a python class.')
return value
def validate(self, value, model_instance):
if not issubclass(value, DashboardProvider):
raise ValidationError('This is not a valid Dashboard provider class')
def get_prep_value(self, value):
"""Converts type to string."""
if isinstance(value, type):
value = classpath(value)
return value
def value_to_string(self, obj):
value = self._get_val_from_obj(obj)
return self.get_prep_value(value)
def formfield(self, **kwargs):
defaults = {'choices_form_class': DashboardTypeChoiceField}
defaults.update(kwargs)
return super(DashboardProviderChoiceField, self).formfield(**defaults)