Precondition

A precondition on a document, used for conditional operations.

JSON representation
{ // Union field `condition_type` can be only one of the following: "exists": boolean, "updateTime": string // End of list of possible types for union field `condition_type`. }

Fields

Fields
Union field `condition_type`. The type of precondition. `condition_type` can be only one of the following:
`exists`	`boolean` When set to `true`, the target document must exist. When set to `false`, the target document must not exist.
`updateTime`	`string (Timestamp format)` When set, the target document must exist and have been last updated at that time. Timestamp must be microsecond aligned. Uses RFC 3339, where generated output will always be Z-normalized and uses 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: `"2014-10-02T15:01:23Z"`, `"2014-10-02T15:01:23.045123456Z"` or `"2014-10-02T15:01:23+05:30"`.

Union field condition_type. The type of precondition. condition_type can be only one of the following:

exists

boolean

When set to true, the target document must exist. When set to false, the target document must not exist.

updateTime

string (Timestamp format)

When set, the target document must exist and have been last updated at that time. Timestamp must be microsecond aligned.

Uses RFC 3339, where generated output will always be Z-normalized and uses 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".