CODEWITHSUNDEEP
hibernategrailsgrails-orm
Matt Westlake
Matt Westlake

Reputation: 3651

grails hasOne but does not belong to

I'm working on a project and have an Invoice domain class that currently hasOne=[billingAddress:Address] When I try to launch my server, I get the following error:

hasOne property [Invoice.billingAddress] is not bidirectional. Specify the other side of the relationship!

I don't want to assign the other side of the relationship though... Invoices have a billing address but Addresses do not belong to Invoices. Addresses belong to Users!!!

What is the proper way to handle this situation?

Upvotes: 1

Views: 1610

Answers (1)

Ian Roberts
Ian Roberts

Reputation: 122364

It sounds like you just need a normal association rather than a hasOne:

class Invoice {
  // other properties

  Address billingAddress
}

The hasOne mechanism is a way to change the database representation for an association, with a conventional Address billingAddress you'll end up with a billing_address_id column in the invoice table, whereas with hasOne the association is instead represented by a foreign key in the address table - this representation only allows one Invoice for each Address, which is why the association has to be bidirectional.

Upvotes: 5

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