CODEWITHSUNDEEP
objective-crealm
arsenius
arsenius

Reputation: 13246

Compare realm objects

Below, d and dictionary refer to the same realm object, but both == and isEqual: result in NO. What is the best method for comparing realm objects that do not have primary keys?

(lldb) po d
UserDictionary {
    dateImported = 2016-02-12 03:44:53 +0000;
    dirtyProperties = RLMArray <0x7f01a110> (

    );
    var1 = ingles;
    var2 = ;
    var3 = ;
    name = bab.la (popup);
    url = http://en.bab.la/dictionary/%(var1)s-english/%(term)s;
    toLanguage = es;
    fromLanguage = en;
}

(lldb) po dictionary
UserDictionary {
    dateImported = 2016-02-12 03:44:53 +0000;
    dirtyProperties = RLMArray <0x7a1b4d30> (

    );
    var1 = ingles;
    var2 = ;
    var3 = ;
    name = bab.la (popup);
    url = http://en.bab.la/dictionary/%(var1)s-english/%(term)s;
    toLanguage = es;
    fromLanguage = en;
}

This must be done somewhere, because I was able to use indexOfObject in RLMResults as a workaround.

Upvotes: 0

Views: 1484

Answers (2)

Thomas Goyne
Thomas Goyne

Reputation: 8138

isEqualToObject: checks if two object instances refer to the same underlying persisted object.

Upvotes: 3

Crazyrems
Crazyrems

Reputation: 2591

The default isEqual: implementation simply compares the memory address, as == does.

You must implement the -isEqualToUserDictionary:(UserDictionary*) yourself.
You can also implement the -isEqual:(id) method, but you should check the type of the object first inside the method.

You shouldn't compare the primary key of the object, but all of its fields instead.

Implementing -hash is a nice way to make your objects comparable.

Upvotes: 2

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