Ruby on Rails

Let's say I have a model called User. User has two attributes or table
columns: id, username

By using the code below I can check that there is a username "Tom" and
return 1 ifthere is and 0 if there is not

User.find_by_username("Tom")? 1 : 0



How would I find out Tom's corresponding id?



For example I'm looking for something along the lines of:
User.find_by_username("Tom").id

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