Ruby methods can have both positional and keyword arguments, so, in this case, the `has_many` method takes the symbol `:players` as an argument and takes a keyw

Ruby methods can have both positional and keyword arguments, so, in this case, the `has_many` method takes the symbol `:players` as an argument and takes a keyword argument called `dependent:` which is being passed the symbol `:destroy_async`. Where a symbol in Ruby is an immutable identifier. So a method like this would be defined as something like: def has_many(model_name, dependent:) puts model_name.to_s puts dependent.to_s end Which you could then call as: has_many(:players, dependent: :destroy_async) or has_many :players, dependent: :destroy_async Since you don't need to put parenthesis around method arguments in ruby.