Rails - How to use variable as part of method name

Question

I am trying to add variable name into method_name in rails. I am getting error.

**Controller ACTION**
=====================
def my_action(state)
   method_#{state}
end

**Model methods**
====================
def method_start
end

def method_end
end

how to call method with variable name i am not getting.

possible duplicate of How to call methods dynamically based on their name? — Aleksey Shein
– Aleksey Shein, Commented Sep 15, 2015 at 7:27
here i need to call different model methods. is it possible using this method? — Savita.V.Malaghan
– Savita.V.Malaghan, Commented Sep 15, 2015 at 7:35

Shouichi · Accepted Answer · 2015-09-15 07:41:57Z

2

Use Object.send to call method by name. For example,

def my_action(state)
  if [:start, :end].include?(state)
    model.send("method_#{state}")
  end
end

Make sure to validate state variable for security. Object.send can call any method including private ones.

answered Sep 15, 2015 at 7:41

Shouichi

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1 Comment

Steven Hirlston Over a year ago

Whenever possible, it's better to use public_send when calling from outside the class. public_send can only call public methods, not private ones. Calling a private method from outside the containing class breaks encapsulation and should be avoided.

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