本文整理汇总了Python中django.contrib.gis.db.models.ManyToManyField方法的典型用法代码示例。如果您正苦于以下问题：Python models.ManyToManyField方法的具体用法？Python models.ManyToManyField怎么用？Python models.ManyToManyField使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类django.contrib.gis.db.models的用法示例。
在下文中一共展示了models.ManyToManyField方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: create_related_field
# 需要导入模块: from django.contrib.gis.db import models [as 别名]
# 或者: from django.contrib.gis.db.models import ManyToManyField [as 别名]
def create_related_field(self, field_name, related_field_configuration):
"""
Creates a ForeignKey or ManyToMany field based on related_field_configuration
:param field_name:
:param related_field_configuration: A dict containing related_key or related_class_name
related_key: the instance of the sibling key of the config_entity whose dynamic_model_class is the relation type.
For DbEntity/Features this would be the db_entity_key and the dynamic_model_class would be its FeatureClass
For AnalysisModule this would be the analysis module key and its dynamic class
related_class_name: rather than related_key, any model class, such as BuiltForm, to relate to.
single: if True this is a ForeignKey (toOne) relationship. Otherwise a ManyToMany is created
:return: A two-item tuple. First item is the field name and the second is the field.
"""
config_entity = ConfigEntity._subclassed_by_id(self.configuration.scope)
# TODO temp coverage of a key name name change
related_field_configuration['related_key'] = related_field_configuration.get('related_key', related_field_configuration.get('related_db_entity_key'))
if related_field_configuration.get('related_key', False):
# field name matches name of peer self.db_entity_key--get it's feature class name
related_db_entity = get_single_value_or_none(config_entity.computed_db_entities(key=related_field_configuration['related_key']))
# Always call with no_ensure=True since the config_entity is the same. Otherwise we'd get infinite recursion
related_class_name_or_model = self.__class__(self.config_entity, related_db_entity, no_ensure=True).dynamic_model_class()
elif related_field_configuration.get('related_class_name', None):
# A model class such as BuiltForm
related_class_name_or_model = resolve_module_attr(related_field_configuration['related_class_name'])
else:
raise Exception("No related_key or related_class_name found on feature_class_configuration for self.configuration.key %s" % self.configuration.key)
logger.info('Creating %r related field for %s using %s', related_field_configuration.get('single', None) and 'single' or 'm2m',
field_name, related_field_configuration)
if related_field_configuration.get('single', None):
return [field_name,
models.ForeignKey(related_class_name_or_model, null=True)]
else:
return [field_name,
models.ManyToManyField(related_class_name_or_model,
# Pass a custom, readable table name for the through class for ManyToMany relations
db_table='"{schema}"."{table}_{field_name}"'.format(
schema=config_entity.schema(),
table=self.configuration.key,
field_name=field_name))]