本文整理汇总了Python中jsonfield.JSONField方法的典型用法代码示例。如果您正苦于以下问题：Python jsonfield.JSONField方法的具体用法？Python jsonfield.JSONField怎么用？Python jsonfield.JSONField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jsonfield的用法示例。
在下文中一共展示了jsonfield.JSONField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: optimize_queryset_for_list
# 需要导入模块: import jsonfield [as 别名]
# 或者: from jsonfield import JSONField [as 别名]
def optimize_queryset_for_list(queryset):
""" Used by serializers to improve performance when listing assets """
queryset = queryset.defer(
# Avoid pulling these `JSONField`s from the database because:
# * they are stored as plain text, and just deserializing them
# to Python objects is CPU-intensive;
# * they are often huge;
# * we don't need them for list views.
'content', 'report_styles'
).select_related(
# We only need `username`, but `select_related('owner__username')`
# actually pulled in the entire `auth_user` table under Django 1.8.
# In Django 1.9+, "select_related() prohibits non-relational fields
# for nested relations."
'owner',
).prefetch_related(
# We previously prefetched `permissions__content_object`, but that
# actually pulled the entirety of each permission's linked asset
# from the database! For now, the solution is to remove
# `content_object` here *and* from
# `ObjectPermissionNestedSerializer`.
'permissions__permission',
'permissions__user',
# `Prefetch(..., to_attr='prefetched_list')` stores the prefetched
# related objects in a list (`prefetched_list`) that we can use in
# other methods to avoid additional queries; see:
# https://docs.djangoproject.com/en/1.8/ref/models/querysets/#prefetch-objects
Prefetch('tags', to_attr='prefetched_tags'),
Prefetch(
'asset_versions',
queryset=AssetVersion.objects.order_by(
'-date_modified'
).only('uid', 'asset', 'date_modified', 'deployed'),
to_attr='prefetched_latest_versions',
),
)
return queryset