nspredicate

[filteredArray filterUsingPredicate: [NSPredicate predicateWithFormat:@"self BEGINSWITH[cd] %@", searchText]]; filteredArray contains simple NSStrings. [hello, my, get, up, seven, etc...]; It will give all strings that begin with searchText . But if string will be a combination of words like "my name is", and searchText = name . What would a NSPredicate look like to achieve this? UPDATE: And how would it have to be if i want to a result with searchText = name , but not with searchText = ame ? Maybe like this: [filteredArray filterUsingPredicate: [NSPredicate predicateWithFormat: @"self

I want to query sqllite table by specifying a range. So it's like give me all records whose id column between 3000 and 3010. I tried what Apple recommends, but it didn't work. Here is what I tried and failed. NSPredicate *betweenPredicate = [NSPredicate predicateWithFormat: @"attributeName BETWEEN %@", @[@1, @10]]; I have 2 strings called start and end. I updated Apple's example as following. NSPredicate *betweenPredicate = [NSPredicate predicateWithFormat: @"%@ BETWEEN %@", columnName, @[start,end]]; When I executeFetchRequest with the above predicate I get 0 records even though the table has

I have to migrate data from a previous app version to a new version. This also affects some predicates ( NSPredicate instances) that were saved by users, which means that I have to change them programmatically. Currently I try to parse the string I get with [NSPredicate predicateFormat] and change some expressions manually. For instance oldKeyPath == "something" to newKeyPath == "something" . But it feels like a hack and I'm curious if there is a better way? I read Apple's documentations about programming with NSPredicate and NSExpression. There are plenty methods to compose NSPredicate

I have two classes, Company and MyCompany. MyCompany is a subclass of Company, and Company is a subclass of NSManagedObject. I am trying to write a predicate for an NSFetchRequest that will return results of the class Company, but filter out MyCompany objects. I have tried the following (suggested from here https://stackoverflow.com/a/8065935/472344 ): NSPredicate *predicate = [NSPredicate predicateWithFormat:@"class != %@",NSStringFromClass([myCompany class])]; But I get an error: 'keypath class not found in entity <NSSQLEntity CKCompany id=1>' I also tried (suggested from here https:/

I've been searching for this answer all over internet but so far no luck. So I need to consult the smart and nice people here. This is my first time asking a question here, so I hope I am doing this right and not repeating the question. For all the examples I saw, it's the search string that is a substring of what's stored in the Core Data. On the other hand, I want to achieve the following: The strings stored in core data are actually sub-strings. I want to do a search by getting all core data rows that have substrings belong to the provided search string. For ex: In core data, I have "AB",

Cocoa defines predicate classes ( NSPredicate , NSExpression , etc.) which "provide a general means of specifying queries in Cocoa" Predicate Programming . This set of classes describes what I need but with one little short-coming : I'd like additional operators. NSComparisonPredicate already handles 14 operators ( NSPredicateOperatorType ) but I would like to add, say, temporal operators... or operators to represent things such as: " variable has at least n entries " (binary operator) " variable has value for, at most, n consecutive days " (ternary operator) Obviously, I would need to

A . b and B . a are inverse to-many relationships. Why does this predicate for A work: NSPredicate *predicate = [NSPredicate predicateWithFormat:@"NOT SELF IN %@", bObject.a]; while this one does not: NSPredicate *predicate = [NSPredicate predicateWithFormat:@"NOT %@ IN b", bObject]; I think both predicates should give the same result — the collection of A s that have no relation with bObject via a<-->b . But in fact, the first one gives the correct collection while the second one not. Update: Here is a sample project wherein A . b is embodied by Account . filtered_clients and B . a is

I would like to be able to search the relationship of an entity using an IN clause. I have the following setup: I would like to send over an array of nicknames and find all Persons associated with those nicknames. //array of names to find let nameArray: [String] = ["Tom", "Tommy", "Thomas"] // find all Persons who have a nickname associated with that person let predicate = NSPredicate(format: "ANY Person.nickName in %@",nameArray) var fetch = NSFetchRequest(entityName: "Person") fetch.predicate = predicate var fetchError : NSError? = nil // executes fetch let results = context?