运算符不存在：没有时区的时间戳~~ *未知的Ruby代码

Question

I am try to query users in the database when I do a search. However i am getting a specific error which is 'operator does not exist: timestamp without time zone ~~* unknown'

In my database, the record of data_of_birth is saving in the format below. Now sure what I am missing. Code below

field == "dob"
            selected_date = Date.strptime(query, '%Y-%m-%d')
            items = Patient.joins(role: :user).where('users.date_of_birth ILIKE :search', search: "%#{selected_date}%")

Here how date_of birth is saving in the DB

 date_of_birth: "1997-03-29 00:00:00"

Answer 1

Timestamps are stored as numbers in the database, not as strings, so using string comparisons (eg ILIKE ) won't work.

It sounds like you're trying to match timestamps to dates. You can simply cast the timestamp to a date for that. Something like:

WHERE users.date_of_birth::date = '2019-06-14'

That would seem to translate to the following, based on your code.

field == "dob"
        selected_date = Date.strptime(query, '%Y-%m-%d')
        items = Patient.joins(role: :user).where('users.date_of_birth::date = :search', search: "%#{selected_date}%")

I'm unfamiliar with the libraries you're using, but it looks like the "::date" part might run into the placeholder functionality. You may need to tinker with that in order for it to work.