PostgreSQL rename attribute in jsonb field

Question

In postgresql 9.5, is there a way to rename an attribute in a jsonb field?

For example:

{ \"nme\" : \"test\" }

should be renamed t

Answer 1

I used the following for handling nested attributes and skipping any json that doesn't use the old name:

UPDATE table_name
SET json_field_name = jsonb_set(json_field_name #- '{path,to,old_name}',
                                '{path,to,new_name}',
                                json_field_name#>'{path,to,old_name}')
WHERE json_field_name#>'{path,to}' ? 'old_name';

just for reference docs:

• #- Delete the field or element with specified path (for JSON arrays, negative integers count from the end) https://www.postgresql.org/docs/current/functions-json.html#FUNCTIONS-JSONB-OP-TABLE

• #>Get JSON object at the specified path https://www.postgresql.org/docs/current/functions-json.html#FUNCTIONS-JSON-OP-TABLE

Answer 2

My variable type is json. When i changed it with jsonb, i cant do it, because it depends on to view. Anyway, i fixed it with column_name::jsonb. I wanted to share with people who meet like this problems. Also thanks @klin

Answer 3

In UPDATE use delete (-) and concatenate (||) operators, e.g.:

create table example(id int primary key, js jsonb);
insert into example values
    (1, '{"nme": "test"}'),
    (2, '{"nme": "second test"}');

update example
set js = js - 'nme' || jsonb_build_object('name', js->'nme')
where js ? 'nme'
returning *;

 id |           js            
----+-------------------------
  1 | {"name": "test"}
  2 | {"name": "second test"}
(2 rows)