How to call a method with named parameters using a hash

Question

How to call a method with named parameters using a hash

Asked 9 years, 10 months ago

Viewed 883 times

-1

I wonder if you have how to pass parameters to a parameter method named via hash. It has to pass the parameters that remain for another function as in the following example?

params = {key: "value",key2: "value2"}
def func(key1: nil, key2: nil, **args)
    other_func **args
    ...
end
func params

Occurrence of the Rails problem:

#No controle
@session = SessionUser.new(params[:session_user].merge(session: session))

# classe SessionUser
def initialize(session: nil, email: nil, password: nil, **args)
    @session = session
    @email = email
    @password = password
end

1

Your example works.

– Guilherme Bernal

2015/02/11 at 14:35
It says that the number of arguments is wrong, it certainly considers the hash as a parameter only and if it were via array (*args) it would work, but this is not what I need

– user5020

2015/02/11 at 14:58
The syntax of hash ** is only valid from version 2.0 Ruby. Before that you should use a hash parameter explicitly.

– utluiz

2015/02/11 at 15:01
My version is 2.1.5, added below the occurrence of the problem to help

– user5020

2015/02/11 at 16:36

1 answer

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by user5020 • **1,027** points · Answer 1 · 2015-02-11T17:18:45+00:00

I found the error, in case I passed a hash that possessed keys no symbols, the same problem was solved in this issue :

https://stackoverflow.com/questions/21394206/ruby-2-keyword-arguments-and-actioncontrollerparameters

In my case, using Rails I can use the '.symbolize_keys' method for those who are only using Ruby it is also possible to solve this way:

my_hash.inject({}){|memo,(k,v)| memo[k.to_sym] = v; memo}