69 lines
2.2 KiB
Python
69 lines
2.2 KiB
Python
from django.conf import settings
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from django.db.models import loading, Manager
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from django.utils import importlib
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def get_model(label, import_module=True):
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app_label, model_name = label.split('.')
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model = loading.get_model(app_label, model_name)
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if model is None:
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# Sometimes the models module is not yet imported
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for app in settings.INSTALLED_APPS:
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if app.endswith(app_label):
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app_label = app
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importlib.import_module('%s.%s' % (app_label, 'admin'))
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return loading.get_model(*label.split('.'))
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return model
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def queryset_as_manager(qs_class):
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# Allow chained managers
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# Based on http://djangosnippets.org/snippets/562/#c2486
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class ChainerManager(Manager):
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def __init__(self):
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super(ChainerManager,self).__init__()
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self.queryset_class = qs_class
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def get_query_set(self):
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return self.queryset_class(self.model)
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def __getattr__(self, attr, *args):
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try:
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return getattr(type(self), attr, *args)
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except AttributeError:
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return getattr(self.get_query_set(), attr, *args)
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return ChainerManager()
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def get_field_value(obj, field_name):
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names = field_name.split('__')
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rel = getattr(obj, names.pop(0))
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for name in names:
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try:
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rel = getattr(rel, name)
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except AttributeError:
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# maybe is a query manager
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rel = getattr(rel.get(), name)
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return rel
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def get_model_field_path(origin, target):
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""" BFS search on model relaion fields """
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queue = []
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queue.append(([origin], []))
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while queue:
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model, path = queue.pop(0)
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if len(model) > 4:
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msg = "maximum recursion depth exceeded while looking for %s"
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raise RuntimeError(msg % target)
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node = model[-1]
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if node == target:
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return path
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for field in node._meta.fields:
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if field.rel:
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new_model = list(model)
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new_model.append(field.rel.to)
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new_path = list(path)
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new_path.append(field.name)
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queue.append((new_model, new_path))
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