CODEWITHSUNDEEP
core-dataafincrementalstore
user2875189
user2875189

Reputation: 11

handling relationship ids with afincrementalstore

In my data model, I have the below entities:

Album:
    - name (required attribute)
    - year
    - tracks 
    ...

Track:
   - name (required attribute)
   - Album
    ...

I have a server data response that includes relationship details by providing just the identifiers of the related objects.

/Albums/1 returns:

{
   id:2,
   name:"The White Album",
   year:1968,
   ...
   tracks: ({id:12}, {id:13}, {id:14})
}

As it stands, AFIncrementalStore can't save the context because the track entity objects are failing validation. Is there any way to address this besides making the relationship optional in the data model?

Upvotes: 0

Views: 120

Answers (1)

Saleh AlDhobaie
Saleh AlDhobaie

Reputation: 311

I think if we think to your own model as follows:

  • Album have many tracks
  • one track has Album

from this information we need a relationship between two Entities (one-To_many) .. you can fetch request with tracks and in method - (NSDictionary *)attributesForRepresentation:(NSDictionary *)representation ofEntity:(NSEntityDescription *)entity fromResponse:(NSHTTPURLResponse *)response you can check for entity name and mapping data to your model ..

as I know if your model name is like response key from server, AFIncremantalStore will do mapping automatically based on keys on your model and response from server ..

thats all I understand from your question and I hope the answer is satisfy to your question ..

Upvotes: 0

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