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I want to create some DRY code by inputting a variable key in the where clause in AR

if I have the field as :email and val as '[email protected]'

how would I write it in Ruby 2 syntax?

with previous syntax I could write

Model.where(field => val)

which would be Model.where(:email => '[email protected]')

in Ruby 2 the where can be written as Model.where(email: '[email protected]')

but how would I use the field variable in this situation?

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  • Some thing. something: value is just a syntax sugar for :something => value. Commented Oct 12, 2014 at 17:58
  • when the symbol :something is stored in a variable, var => val is possible, but ruby 2 syntax is not possible Commented Oct 12, 2014 at 19:19
  • Well, yes, it's just a syntactic sugar. When it's stored in a variable you can do only variable => val. But if you specify the symbol directly you can do both symbol: val and :symbol => val. Now, there are now named arguments in functions in Ruby 2 as well (robots.thoughtbot.com/ruby-2-keyword-arguments), but this is not the case. where(:email => "...") is just yet another syntactic sugar on top of where({:email => "..."}). You can drop {} around hash, if it's the last argument. See stackoverflow.com/questions/16576477/…. Commented Oct 13, 2014 at 1:37
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    so, you should still be able to use the old syntax. It's not the use of Ruby 2 named arguments, it;s just the use of Ruby 1.9 fancy hash syntax: breakthebit.org/post/8453341914/…. I guess, if there is a problem, you can just be more explicit: Model.where({field => val}). Commented Oct 13, 2014 at 1:38
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