![]() Name the file Category.swift and give your new model a single String property named name. The challenge is to create a Category model by yourself. Specimens should be separated into different categories. With your first model created in Realm, are you ready to use this knowledge in a small challenge? Date() returns the current date so the property is initialized with that value. Here, you set the type to Double and initialize them with 0.0.Ĭreated stores the creation date of the specimen. Latitude and longitude store the coordinates for the specimen. In this case, you initialize them with an empty string. Specific data types in Realm, such as strings, must be initialized with a value. Name and specimenDescription store the specimen’s name and description. Open Specimen.swift from the Models group and add the following implementation:Ĭlass Specimen: Object dynamic var name = dynamic var specimenDescription = dynamic var latitude = dynamic var longitude = dynamic var created = Date() With a brief introduction to Realm, it’s time to get your feet wet and build the rest of the project. They have many similarities with regular Arrays including the subscript syntax. Results: Results is an auto-updating container type that you get back from object queries.If your data retrieval needs are more complex, you can make use of predicates, chain your queries and order your results. The simplest form of a query is calling objects() on a Realm instance and passing in the class of the Object you’re looking for. Queries: To retrieve objects from the database you use queries.Write Transactions: Any operations in the database, like creating, editing or deleting objects, must be performed within writes by calling write(_:) on Realm instances.You can create many-to-one and many-to-many relationships via a property of type List. ![]()
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