How to change default attributes

ways_to_change_attributes.rb

# With Vagrantfile's chef.json:

chef.json = {
      "postgresql" => {
        "version" => "9.2"
      }
    }

# Calling a premade databag item, from a recipe
# ! This probably will require modifications
# ! to the recipe, or a wrapper cookbook

node['postgresql']['version'] = data_bag_item('postgresql', 'version')

# In an environment file
node.default['postgresql']['version'] = "9.2"