Question

I’m studying Spree’s source code and I came across the snippet.

Spree.config do |config|
  # Example:
  # Uncomment to override the default site name.
  # config.site_name = "Spree Demo Site"
end

How is this being implemented? I cannot find Spree.config defined anywhere as a method. I’m guessing some meta-programming is involved.

Answer 1

Looks like it is defined in https://github.com/spree/spree/blob/master/core/lib/spree/core.rb (line 68 at this time).

config is a module method on the Spree module. It’s implementation passes the Spree::Config object to the given block.