Question

I am using Ruby on Rails 3.2.2. I have the following scenario:

# hash_params.class
# => Hash
# hash_params.inspect
# => { :key1 => :value1, :key2 => value2, ... => ... }
#
def self.method_1(hash_params)
  hash_params.each do { |hash_param| self.method_2(hash_param) }
end

# param.class
# => Array
# param.inspect
# => [:key1, value1] # or '[:key2, value2]' or '[..., ...]', depending on cases.
# 
def self.method_2(param)
  logger.debug "Key   => #{param[0])"
  logger.debug "Value => #{param[1])"
end

Given outputs commented out in the above code, when I run the method_1 then in the logger file I have the following:

Key   => :key1
Value => :value1
Key   => :key2
Value => :value2
Key   => ...
Value => ...

I would like to treat the param variable in method_2 as-like a key / value pair (not as an Array), for example by making something like the following

def self.method_2(param)
  param do |key, value| # Note: This code line doesn't work. It is just a sample code to clarify the question.
    logger.debug "Key   => #{key.inspect)"
    logger.debug "Value => #{value.inspect)"
  end
end

? Is it possible? If so, how? What do you advice about?

Answer 1

How about

def self.method_1(hash_params)
  hash_params.each do { |key, value| self.method_2(key, value) }
end

def self.method_2(key, value)
  logger.debug "Key   => #{key)"
  logger.debug "Value => #{value)"
end

Otherwise you can still pass a hash in param like

def self.method_1(hash_params)
  hash_params.keys.each do { |key| self.method_2(hash_params.slice(key)) }
end

edit: if you want a hash as parameter you could just do

def self.method_1(hash_params)
  hash_params.each do { |key, value| self.method_2({key => value}) }
end