Change json datatype to jsonb

README.md

@@ -239,9 +239,10 @@ All configuration takes place in the form of environment vars. See [queue_classi
 
 ## JSON
 
-If you are running PostgreSQL 9.2 or higher, queue_classic will use the [json](http://www.postgresql.org/docs/9.2/static/datatype-json.html) datatype for storing arguments. Versions 9.1 and lower will use the 'text' column. If you have installed queue_classic prior to version 2.1.4 and are running PostgreSQL >= 9.2, run the following to switch to using the json type:
+If you are running PostgreSQL 9.4 or higher, queue_classic will use the [jsonb](http://www.postgresql.org/docs/9.4/static/datatype-json.html) datatype for new tables. Versions 9.2 and 9.3 will use the `json` data type and versions 9.1 and lower will use the `text` data type.
+If you are updating queue_classic and are running PostgreSQL >= 9.4, run the following to switch to `jsonb`:
 ```
-alter table queue_classic_jobs alter column args type json using (args::json);
+alter table queue_classic_jobs alter column args type jsonb using (args::jsonb);
 ```
 
 ## Logging

changelog

@@ -1,5 +1,6 @@
 Unreleased
 - Fixed a bug in the offset calculation of `.enqueue_at`.
+- Use the jsonb type for the args column from now on. If not available, fall back to json or text.
 
 Version 3.0.0rc
 - Improved signal handling

sql/create_table.sql

@@ -11,10 +11,12 @@ CREATE TABLE queue_classic_jobs (
   scheduled_at timestamptz default now()
 );
 
--- If json type is available, use it for the args column.
-perform * from pg_type where typname = 'json';
-if found then
-  alter table queue_classic_jobs alter column args type json using (args::json);
+-- If jsonb type is available, use it for the args column
+if exists (select 1 from pg_type where typname = 'jsonb') then
+  alter table queue_classic_jobs alter column args type jsonb using args::jsonb;
+-- Otherwise, use json type for the args column if available
+elsif exists (select 1 from pg_type where typname = 'json') then
+  alter table queue_classic_jobs alter column args type json using args::json;
 end if;
 
 end $$ language plpgsql;