Ruby on Rails

How can I use ruby on rails input field selector?

This is form:

<input id="user_user_name" class="form-control" type="text"
name="user[user_name]" placeholder="Company Name">

Jquery

user_user_name:{
validators: {
notEmpty: {
message: 'The company name is required and
cannot be empty'
}
}
},

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