60 lines
1.9 KiB
Python
60 lines
1.9 KiB
Python
from django.conf import settings
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from django.core.exceptions import FieldDoesNotExist
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from django.apps import apps
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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 = apps.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 apps.get_model(*label.split('.'))
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return model
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def has_db_field(obj, field_name):
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try:
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obj._meta.get_field(field_name)
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except FieldDoesNotExist:
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return False
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return True
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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 from %s"
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raise RuntimeError(msg % (target, origin))
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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.remote_field:
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new_model = list(model)
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new_model.append(field.remote_field.model)
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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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raise LookupError("Path does not exists between '%s' and '%s' models" % (origin, target))
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