关于 def 的 Ruby 问题

Question

I am very new to ruby and I would like to understand few syntax. When I define something like,

def attribute
  {
    id:                @object.id,
    password:          @object.password
    non_academic:      !!@object.non_academic
  }.merge(subject)
end

what does the codes inside "{}" do, and what are they call. Also, what does line like id: @object.id, means.

Answer 1

It is a method with name attribute ( def attribute ) that returns a Hash (curly braces ´{}´) with Symbol s as keys ( id: , password: , ...). The values are taken from attributes of an instance variable ( @object ) Then the Hash is also combined with another one ( merge )