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NSPredicate for a ANY match based on two properties at once
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NSPredicate for a ANY match based on two properties at once


  • Subject: NSPredicate for a ANY match based on two properties at once
  • From: Jesse Grosjean <email@hidden>
  • Date: Fri, 20 Jun 2008 11:56:48 -0400

I'm having a hard time figuring out how to construct a query. The objects involved are:

Entry
	- has many tags

Tag
	- name (string)
	- value (string)

I want to construct searches such as:

- find all entries that have a the tag named "priority" with the value "1".

I can use [NSPredicate predicateWithFormat:@"ANY tags.name = %@", tag.name] to find all entries that have a particular tag... but I don't know how to also figure in the value.

I don't need this predicate to work with a database, these queries are all just being run in memory, with my own custom model objects (not using Core Data). If there is no way to do this in a format string, is there some way to do it by directly constructing a predicate object?

Thanks,
Jesse
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