mysql - Laravel - how to use foreign primary key that's not an integer? -

I have to set a string column as a primary key of a table, then mention as a foreigner That's the key I'm trying from another table. This is possible Documents per:

  Laravel assumes that each table is a numerical primary key (usually named a ???? ida ???? ) And ensures that the value of this column is unique to each new line added in the table. Laravel works really well until each table has a numerical primary key. Therefore, for your average large application, please make sure that you define the primary key using the scale () method.   
 In my case, I do not want to define a  id  column because it will be useless. The string column that I want to define will act as the primary key. If this is possible, can I find a migration piece of an example?   
 
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 This is an old question, but for the sake of purity, I would like to continue that the present version of the eloquent You can actually use non-numerical primary / foreign key in  
 One thing you just have to do is to set up property  $ incrementing  false  to model that non-autoincrementing ID to use on   
  class employee spread model {public $ incrementing = false. Also, the migration can be:  
  schema :: build ('employee', function (blue print $ Table) {$ table- & gt; string ('id') - & gt; elementary (); // ...});