nspredicate

问题 I got a Realm model Person who has a tag property. let tags = List<Int>() Now, I would like to perform a search like this realm.objects(Person.self).filter(NSPredicate(format: "\(tagID) IN tags")) // "0 IN tags" Error: Terminating app due to uncaught exception 'Invalid value', reason: 'Expected object of type (null) for property 'tags' on object of type 'Person', but received: 0' 回答1: As stated in David's comment, you cannot filter on a list of primitives. You can only filter on List's that

问题 Beginner programmer here. I am trying to show two different color dots if there is a negative AND a positive transaction for that date. Here is my code. It only shows one dot. func calendar(_ calendar: FSCalendar, numberOfEventsFor date: Date) -> Int { let incomeTransaction = realm.objects(Transaction.self).filter(positiveTransactionPredicate(date: date)) let expenseTransaction = realm.objects(Transaction.self).filter(negativeTransactionPredicate(date: date)) for _ in incomeTransaction {

问题 Beginner programmer here. I am trying to show two different color dots if there is a negative AND a positive transaction for that date. Here is my code. It only shows one dot. func calendar(_ calendar: FSCalendar, numberOfEventsFor date: Date) -> Int { let incomeTransaction = realm.objects(Transaction.self).filter(positiveTransactionPredicate(date: date)) let expenseTransaction = realm.objects(Transaction.self).filter(negativeTransactionPredicate(date: date)) for _ in incomeTransaction {

问题 Beginner programmer here. I am trying to show two different color dots if there is a negative AND a positive transaction for that date. Here is my code. It only shows one dot. func calendar(_ calendar: FSCalendar, numberOfEventsFor date: Date) -> Int { let incomeTransaction = realm.objects(Transaction.self).filter(positiveTransactionPredicate(date: date)) let expenseTransaction = realm.objects(Transaction.self).filter(negativeTransactionPredicate(date: date)) for _ in incomeTransaction {

问题 Beginner programmer here. I am trying to show two different color dots if there is a negative AND a positive transaction for that date. Here is my code. It only shows one dot. func calendar(_ calendar: FSCalendar, numberOfEventsFor date: Date) -> Int { let incomeTransaction = realm.objects(Transaction.self).filter(positiveTransactionPredicate(date: date)) let expenseTransaction = realm.objects(Transaction.self).filter(negativeTransactionPredicate(date: date)) for _ in incomeTransaction {

问题 I have an arraycontaining several dictionaries. { DisplayName?:"Name of the employee" Age:28 Department:"Dept 2" } I just converted my objective-c code into swift and trying to filter like this. let exists = NSPredicate(format: "DisplayName2 CONTAINS[cd] \(searchText!)") let aList: Array<Any> = arrayDirectory.filter { exists.evaluate(with: $0) } if(aList.count>0) { arrayDirectory=aList facesCarousel.reloadData() } But I am always getting the aList count as 0. It seems like not filtering my

问题 Lets say I have three Entitys. Person: name address (to-many-salary) and (to-many-loans) Salary: income tax Rel: (to-one-Person) Bills amount Rel: (to-one-person) How do I perform a fetch that have a result like this: John Doe, SUM>income, SUM>amount Eva Doe, SUM>income, SUM>amount Using Swift 回答1: This is probably most easily done using Key Value Coding "collection operators" (see here) rather than a fetch. For each person : let name = person.name let totalIncome = person.valueForKeyPath(

问题 Lets say I have three Entitys. Person: name address (to-many-salary) and (to-many-loans) Salary: income tax Rel: (to-one-Person) Bills amount Rel: (to-one-person) How do I perform a fetch that have a result like this: John Doe, SUM>income, SUM>amount Eva Doe, SUM>income, SUM>amount Using Swift 回答1: This is probably most easily done using Key Value Coding "collection operators" (see here) rather than a fetch. For each person : let name = person.name let totalIncome = person.valueForKeyPath(

问题 This should be straightforward but something is preventing me from filtering an array of custom objects by NSNumber using NSPredicate. Perhaps it has something to do with the datatype when converting from JSON but I can't figure it out. I download data from a JSON in an array of custom Objects that look like: {"hid":"47","public":"1"} The code to parse the JSON looks like: if (feedElement[@"public"] && ![feedElement[@"public"] isEqual:[NSNull null]]) { newMyObject.pub = feedElement[@"public"]

问题 Here is my current NSPredicate: NSPredicate *predicate = [NSPredicate predicateWithFormat:@"UPC==%@ OR ItemID==%@", aUPCCode,aUPCCode]; How can I make this case insensitive? And I do not want to do any partial matching. Example if they enter 123 for aUPCCode I do not want to get 123, 123a, 123b, 123c, ect. I would only want an exact match. I thought about doing this but it seems a little ridiculous: NSPredicate *predicate = [NSPredicate predicateWithFormat:@"UPC==%@ OR ItemID==%@ OR UPC==%@