Question

I have a method that has a boolean value as a parameter. I’m aware it’s better to avoid boolean values. Anyway in my case it’s most efficient way.

Well, here is a method:

  def some_method(include_some_values = false)
          #do some workcountries = []
          if include_some_values 
             #do some additional work  
           end
           #return value
    end

calling (haml)

= form_for @address do |f|
  = f.select :fied1, MyModel.some_method(true) #it's okay

However if I call it as

= f.select :fied1, MyModel.some_method true 

or

= f.select :fied1, MyModel.some_method :true 

or

= f.select :fied1, MyModel.some_method false 

or

= f.select :fied1, MyModel.some_method :false 

then it’s not going to work. Why?

Answer 1

Probably

= f.select :fied1, MyModel.some_method true

is interpreted as:

= f.select(:fied1, MyModel.some_method) true

So just use parenthesizes to avoid ambiguity.

PS: :true is a symbol, so there’s no reason to fiddle with symbols if your dealing with booleans.