Question

I want to create a one to many relationship. My setup is something like:

I have the Profile Entity,
I have the Time entity.

Every profile has a relationship to Time.

How can I define relationships, and add multiple Time entities to a single profile?

I bet it is obvious, but I can’t see how to implement.

Answer 1

edit after posting the answer I saw your comment – to define a to-many relationship in the modeller, select the relationship and choose to-many from the options:

To populate the relationship, you can do it two ways. I am assuming your Profile entity has a to-many relationship called times and the inverse relationship is a to-one relationship called profile.

• Set the profile on each Time entity as you are creating them. This will automatically populate the inverse relationship (i.e. add the Time to the times set of the profile).
• Collect the relevant Time entities in a set and set the times property to this set. Again, the inverse will be automatically populated.

There is more information here. Accessor methods to add individual entities to a to-many relationship can be generated from the managed object model editor in Xcode.