How to query JSONB field type

All we need is an easy explanation of the problem, so here it is.

I have a jsonb field named ‘queues’ it contains the following:

{
  "call_queue_pid": [
    1,
    2,
    3
  ],
  "omni_queue_pid": [
    4,
    5,
    6
  ]
}

I try the below query to search omni_queue_pid = 5

Select * 
from ws a,
    jsonb_array_elements(a.queues::jsonb) j 
Where cast(j->> 'omni_queue_pid' as integer) = 5

but it returns SQL Error [22023]: ERROR: cannot extract elements from an object

what I missed?

need help

thanks
Don

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

You need to unnest the array:

Select * 
from ws a
  cross join jsonb_array_elements_text(a.queues -> 'omni_queue_pid') as o(id)
Where o.id::int = 5

It’s unclear what result you exactly want, but an EXISTS condition might be more efficient:

select * 
from ws a
where exists (select *
              from jsonb_array_elements_text(a.queues -> 'omni_queue_pid') as o(id)
              Where o.id::int = 5)

Or using a jsonpath operator:

select * 
from ws
where queues @? '$.omni_queue_pid[*] == 5'

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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