Mapping DataĬloud Firestore stores data in documents which map keys to values. And it’s easy to add support for mapping custom typesĪnd - best of all: for simple data models, you won’t have to write any mapping code at all. It has built-in support for many of Swift’s types.It’s easy to define how to map attributes with different names.You will no longer have to manually implement any mapping code.With Firestore’s support for Swift’s Codable API, this becomes a lot easier: But again, most of these implementations are based on manually specifying the mapping between Firestore documents and the corresponding types of your app’s data model. In the past, many developers have worked around these shortcomings by implementing a simple mapping layer that allowed them to map dictionaries to Swift types. However, this approach isn’t type-safe and it’s easy to introduce hard-to-track-down bugs by misspelling attribute names, or forgetting to map that new attribute your team added when they shipped that exciting new feature last week. Now, you can certainly use dictionaries in Swift, and they offer some great flexibility that might be exactly what your use case calls for. When fetching a document from Firestore, your app will receive a dictionary of key/value pairs (or an array of dictionaries, if you use one of the operations returning multiple documents). You can even create subcollections within documents, and build hierarchical data structures. Documents support many data types such as strings and numbers, but also complex, nested objects. Documents are stored in collections, which you can think of as containers that you can use to organise your data. Data is stored in documents that contain fields mapping to values. If you’re new to Cloud Firestore - it is a horizontally scaling NoSQL document database in the cloud, part of Firebase’s Backend-as-a-Service products. In this article, we’re going to look at how Codable can be used to map data from Firestore to Swift types and vice versa. You might have been using Codable to map data from a web API to your app’s data model (and vice versa), but it is much more flexible than that. Swift’s Codable API, introduced in Swift 4, enables us to leverage the power of the compiler to make it easier to map data from serialised formats to Swift types.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |