realm-list

问题 Conversation class previously had a string field named "message". Now this "message" field is removed and i have added a "RealmList allMessages" inside Conversation class instead of old "message" field. ChatMessage class has a field name "messageText". How can i migrate "message" from Conversation class to "messageText" of list "allMessages"?? public class ChatMessage extends RealmObject implements Parcelable { .... private String messageText; .... } Old Conversation class. public class

问题 Conversation class previously had a string field named "message". Now this "message" field is removed and i have added a "RealmList allMessages" inside Conversation class instead of old "message" field. ChatMessage class has a field name "messageText". How can i migrate "message" from Conversation class to "messageText" of list "allMessages"?? public class ChatMessage extends RealmObject implements Parcelable { .... private String messageText; .... } Old Conversation class. public class

问题 Scenario: I have a model(DBBasket) to persist locally, the number of added products and products itself. When the user clicks on the + button under each product thumbnail I'm increasing totalQuantity in Product , Adding the product to the DBBasket , Set totalProducts which I get from server, in DBBasket too. Codes in + button: holder.HomeProductBindGrid.thatPlusButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final Product productIns =

问题 This is how my Object classes looks like: Workout.swift: class Workout: Object { @objc dynamic var date: Date? // List of exercises (to-many relationship) var exercises = List<Exercise>() } Exercise.swift class Exercise: Object { @objc dynamic var name: String? // List of sets (to-many relationship) var sets = List<Set>() var parentWorkout = LinkingObjects(fromType: Workout.self, property: "exercises") } Set.swift class Set: Object { @objc dynamic var reps: Int = 0 @objc dynamic var kg:

问题 I have a model 'A' that have a list that can be of type 'B' or 'C' and more. I know Polymorphism is not supported by Realm and i cant just do RealmList<RealmObject> or RealmList<? extends RealmObject> . I just can't figure out how to implement this behavior with Realm. 回答1: Polymorphism support is tracked here: https://github.com/realm/realm-java/issues/761 , but as long as it isn't implemented you have to use composition instead (https://en.wikipedia.org/wiki/Composition_over_inheritance) In

问题 Due to Realm inability to work with promotive types, which include String s, I'm trying to implement a JsonDeserializer just like in this question. The issue is that I'm baffled on to why I'm getting the following error: W/System.err: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING This is part of the Json: "tags": ["GLUTEN FREE", "NUT FREE"], My RealmString: public class RealmString extends RealmObject { private String value; public

问题 In my app, I have a method that accepts an ArrayList of ID's and returns a RealmList of Machines belonging to these IDs. public RealmList<Machine> getMachinesById(ArrayList<Long> machineIds) { RealmList<Machine> machines = new RealmList<Machine>(); for (int i = 0; i < machineIds.size(); i++){ Machine m = getMachineById(machineIds.get(i)); if (m != null) { machines.add(m); } } return machines; } The getMachineById() function just finds the correct machine for a specific id. I want to filter

问题 This question is a follow-up question from: Organize Android Realm data in lists Due to the data returned by the API we use, it's slightly impossible to do an actual query on the realm database. Instead I'm wrapping my ordered data in a RealmList and adding a @PrimaryKey public String id; to it. So our realm data looks like: public class ListPhoto extends RealmObject { @PrimaryKey public String id; public RealmList<Photo> list; // Photo contains String/int/boolean } which makes easy to write

问题 How do I prevent adding duplicates to a list in RealmSwift ? I have my User as a realm object, but the real data source is a server (simply caching the user locally with Realm). When I get the current user data from my server, i want to make sure that my user stored in realm has all the playlists coming from the server (and that their in sync wrt list of tracks and etc.). I'm worried that if i loop over those lists from the server, appending to myUser.playlists , that I may end up adding the

问题 First day using React Native and Realm, and I'm having a hard time figuring how to perform a query through two Realm List Objects. Tasks have Reservations , which have Renters , which have first_name and last_name fields. I want my users to be able to search for tasks by the Renter's first and last names. Essentially, "Give me all the tasks whose renter's first or last name begins with "xyz"" const TaskSchema = { name:'Task', properties: { reservations:{ type: LIST, objectType: