Ruby方法返回多个变量

Question

I need to return to my Rails view more than one variable from method... But how could i do this?

For example now i have

def my1
 @price = 1
 @price
end

but how could i also return other valuem somethin like:

def my1
 @qnt = 2
 @price = 1
 @price, @qnt
end

?

Also my idea is to split them to string like

@price + "/-/" + @qnt

and then just split them via /-/ in view.... But this is a bad practice... So how could i get from one method two or more variables?

Answer 1

Return an array:

def my1
 qnt = 2
 price = 1
 [price, qnt]
end

then you can do this:

p, q = my1() # parentheses to emphasize a method call
# do something with p and q

Option 2

Or you can return a custom object, like this:

require 'ostruct'

def my1
 qnt = 2
 price = 1

 OpenStruct.new(price: price, quantity: qnt)
end


res = my1() # parentheses to emphasize a method call

res.quantity # => 2
res.price # => 1

Answer 2

Use another object that will hold the variables and return it. You can then access the variables from that object;

Answer 3

Array

The easiest way is to return an Array :

def my1
  @qnt = 2
  @price = 1
  [ @price, @qnt ]
end

price, quantity = my1

Hash

But you could also return a Hash :

def my1
  @qnt = 2
  @price = 1
  { :quantity => @qnt, :price = @price
end

return_value = my1

price = return_value[:price]
quantity = return_value[:quantity]
# or
price, quantity = [ return_value[:price], return_value[:quantity] ]

Custom Class

Or a custom Class:

class ValueHolder
  attr_reader :quantity, :price

  def initialize(quantity, price)
    @quantity = quantity
    @price = price
  end
end

def my1
  @qnt = 2
  @price = 1
  ValueHolder.new(@qnt, @price)
end

value_holder = my1

price = value_holder.price
quantity = value_holder.quantity
# or
price, quantity = [ value_holder.price, value_holder.quantity ]

OpenStruct

You could use OpenStruct as Sergio mentioned .