ERROR: 42883: function “lock_database” does not exist at character 8

I’am working on a gis project with postrgresql, and with ruby on rails tools, I can write data to the db.
But when I checking the log of postgresql, I got the following error:

2020-08-23 22:39:32.454 CST [79106] chentoz@gis-edit ERROR: 42883: function “lock_database” does not exist at character 8

I got no clue from google about topic like “lock_database”, and there is also a saying that database lock is not implemented yet.

Have any guy met with error or some hints for digging the error ?

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Author: tonyc