Chef recipe not found for cookbook - postgresql

Question

I am trying to use Chef's PostgreSQL cookbook:
https://supermarket.chef.io/cookbooks/postgresql#readme
I am getting this error:
Chef::Exceptions::RecipeNotFound: could not find recipe default for cookbook postgresql
I don't see a default.rb in the repo:
https://github.com/sous-chefs/postgresql/find/main
I've added the dependencies to Berksfile and metadata.rb and in my recipe added:
include_recipe 'postgresql'
I also added a default.rb to my repo and include_recipe 'postgresql' to that.
Still keeps saying no default recipe. Am I missing something here?
Edit:
Based on seshadri_c's answer, this is error is now gone.
I'm trying to install extension.
Have this in my default.rb:
postgresql_extension 'postgres adminpack' do
database 'postgres'
extension 'adminpack'
end
But get error
FATAL: NoMethodError: postgresql_extension[postgres adminpack] (******::default line 5) had an error: NoMethodError: bash[CREATE EXTENSION postgres adminpack] (/tmp/packer-chef-solo/local-mode-cache/cache/cookbooks/postgresql/resources/extension.rb line 31) had an error: NoMethodError: undefined method `[]' for nil:NilClass[0m

Answer 1

A major change was introduced in the postgresql cookbook v7.0. Quoting from supermarket page:
If you are wondering where all the recipes went in v7.0+, or how on earth I use this new cookbook please see upgrading.md for a full description.
In short, all of the cookbooks functionality has been moved from recipes to custom resources.
So, now the correct way to reuse that functionality is to "invoke" the appropriate resource instead of "including" recipes.
Example to install PostgreSQL client from my_pg_client cookbook:
In my_pg_client/metadata.rb:
depends 'postgresql' # version pin as required
Then in my_pg_client/recipes/default.rb:
# Install client software
postgresql_client_install 'My PostgreSQL Client install' do
version '9.5'
end
There are other similar custom resources, if you want to install server for example:
postgresql_server_install 'My PostgreSQL Server install' do
version '9.5'
action :install
end
There are a number of examples on how to use the custom resources in: https://github.com/sous-chefs/postgresql/tree/main/test/cookbooks/test/recipes
Update:
The postgresql_extension resource by default installs extension which is supplied as the name to the resource. So, the extension 'adminpack' property can be omitted. You could try something like:
# Considering that a DB called "postgres" exists
postgresql_extension 'adminpack' do
database 'postgres'
end