How to create unique constraint for 2 columns in JDL-Studio?

Question

I have following entity configuration:

entity AirplaneModelSeat { 
    id Long, 
    seatNo String required 
}
relationship ManyToOne   { 
    AirplaneModelSeat{         


        

Answer 1

In addition to the Liquibase configuration in David's answer I suggest you also add the relevant JPA annotations to your Entity. Here is an example how:

@Table(name = "table_name",
    uniqueConstraints = {@UniqueConstraint(columnNames = {"field_1", "field_2"})})

Note that since in this case @UniqueConstraint is applied at Entity (i.e. Table) level, you can combine multiple fields into a composite unique key.