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I am getting the following values to put into my JSON stringify method. I will use it for AJAX. The field_name variable can vary. 

value = input.val()
parent = input.parent()
userId = parent.data().userid
field_name = parent.data().field

$.ajax "/api/users/#{userId}",
  method: 'PATCH'
  contentType: 'application/json'
  dataType: 'json'
  data: JSON.stringify( {user:{field_name:value}})
  success: (data) =>

However, the keys in {user:{field_name:value}} do not express variables. Only the value of the k-v pair can express variables. How can I make the key field_name use variables to be flexible for this?

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