Question 1

How to map nested JSON objects with Mantle?

Accepted Answer

Use dot notation in +JSONKeyPathsByPropertyKey, like "user.login" for nested keys, and implement transformers for sub-models using +assigneeJSONTransformer as shown in the GHIssue example.

Question 2

Mantle vs Core Data: which one should I use?

Accepted Answer

Mantle is best for simple JSON API interactions without complex queries, while Core Data excels at large object graphs, persistence, and undo/redo features, as noted in the README's comparison.

Question 3

How to handle date transformations in Mantle?

Accepted Answer

Implement a custom value transformer using MTLValueTransformer, like the updatedAt example that uses a dateFormatter to convert between strings and NSDate objects bidirectionally.

Question 4

Can Mantle be used with Swift?

Accepted Answer

Yes, but it requires Objective-C bridging and may not integrate as smoothly as Swift's Codable. The framework supports SPM, Carthage, and CocoaPods for inclusion in mixed-language projects.

Question 5

How to serialize Mantle models back to JSON?

Accepted Answer

Use +[MTLJSONAdapter JSONDictionaryFromModel:error:], which leverages reversible transformers defined in your model to convert properties back to JSON dictionaries, as explained in the MTLModel section.

Question 6

Mantle or Codable for new iOS projects?

Accepted Answer

Codable is built-in for Swift and more modern, but Mantle offers finer control, model versioning, and better Objective-C compatibility. Choose Mantle if you need legacy support or advanced features beyond basic JSON parsing.

Mantle

What is Mantle?

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