Re: Need help with predicate format
On 28 Jul 2008, at 1:52 pm, Omar Qazi wrote: To be honest, I don't know if this will work, since I don't know if containsObject is checking if the argument is a pointer to an object in the array, or if it is equal to the object, but it's better than nothing, I guess. From the docs: containsObject: Returns a Boolean value that indicates whether a given object is present in the receiver. - (BOOL)containsObject:(id)anObject Parameters anObject An object. Return Value YES if anObject is present in the receiver, otherwise NO. Discussion This method determines whether anObject is present in the receiver by sending an isEqual: message to each of the receiver’s objects (and passing anObject as the parameter to each isEqual: message). Availability • Available in Mac OS X v10.0 and later. cheers, Graham___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
Re: Need help with predicate format
Thanks. Maybe I should have made myself a little more clear. I don't want to iterate over the array, but filter the array using a NSPredicate. I'm looking at the Predicate Programming Guide, which only gives basic guidance, and the docs for NSExpression. It has several class methods that sound right (expressionForEvaluatedObject:, expressionForAggregate:, expressionForSubquery:usingIteratorVariable:predicate:, expressionForFunction:arguments:) but provides no examples how to use them. Unfortunately Google has very little to say on this subject too. To repeat the problem: I want to check the value of all keys in every dictionary contained by an array and see if they match my search string. A workaround to compensate for my syntax ignorance would be to add a new instance method to my custom class that simply return all the values I want to check in a single array. Then I could query it with a simple single-relationship predicate: NSPredicate *predicate = [NSPredicate predicateWithFormat:@(%@ IN values, searchString)]; NSArray filteredArray = [myArray filteredArrayUsingPredicate:predicate]; But somehow I believe there is a more direct way to do this, without having to add a new helper method to my class? I'm perfectly happy with a 10.5 only solution. Thanks. On Mon, Jul 28, 2008 at 8:30 AM, Graham Cox [EMAIL PROTECTED] wrote: On 28 Jul 2008, at 1:52 pm, Omar Qazi wrote: To be honest, I don't know if this will work, since I don't know if containsObject is checking if the argument is a pointer to an object in the array, or if it is equal to the object, but it's better than nothing, I guess. From the docs: containsObject: Returns a Boolean value that indicates whether a given object is present in the receiver. - (BOOL)containsObject:(id)anObject Parameters anObject An object. Return Value YES if anObject is present in the receiver, otherwise NO. Discussion This method determines whether anObject is present in the receiver by sending an isEqual: message to each of the receiver's objects (and passing anObject as the parameter to each isEqual: message). Availability • Available in Mac OS X v10.0 and later. cheers, Graham ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
Re: Need help with predicate format
Hi, I would recommend taking a look at the following document. http://developer.apple.com/documentation/Cocoa/Conceptual/Predicates/predicates.html Good luck, -Conrad On Mon, Jul 28, 2008 at 1:02 AM, Fabian [EMAIL PROTECTED] wrote: Thanks. Maybe I should have made myself a little more clear. I don't want to iterate over the array, but filter the array using a NSPredicate. I'm looking at the Predicate Programming Guide, which only gives basic guidance, and the docs for NSExpression. It has several class methods that sound right (expressionForEvaluatedObject:, expressionForAggregate:, expressionForSubquery:usingIteratorVariable:predicate:, expressionForFunction:arguments:) but provides no examples how to use them. Unfortunately Google has very little to say on this subject too. To repeat the problem: I want to check the value of all keys in every dictionary contained by an array and see if they match my search string. A workaround to compensate for my syntax ignorance would be to add a new instance method to my custom class that simply return all the values I want to check in a single array. Then I could query it with a simple single-relationship predicate: NSPredicate *predicate = [NSPredicate predicateWithFormat:@(%@ IN values, searchString)]; NSArray filteredArray = [myArray filteredArrayUsingPredicate:predicate]; But somehow I believe there is a more direct way to do this, without having to add a new helper method to my class? I'm perfectly happy with a 10.5 only solution. Thanks. On Mon, Jul 28, 2008 at 8:30 AM, Graham Cox [EMAIL PROTECTED] wrote: On 28 Jul 2008, at 1:52 pm, Omar Qazi wrote: To be honest, I don't know if this will work, since I don't know if containsObject is checking if the argument is a pointer to an object in the array, or if it is equal to the object, but it's better than nothing, I guess. From the docs: containsObject: Returns a Boolean value that indicates whether a given object is present in the receiver. - (BOOL)containsObject:(id)anObject Parameters anObject An object. Return Value YES if anObject is present in the receiver, otherwise NO. Discussion This method determines whether anObject is present in the receiver by sending an isEqual: message to each of the receiver's objects (and passing anObject as the parameter to each isEqual: message). Availability • Available in Mac OS X v10.0 and later. cheers, Graham ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/conradwt%40gmail.com This email sent to [EMAIL PROTECTED] ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
Re: Need help with predicate format
Thanks. As I said, I already read that but it doesn't give any examples on how to format subqueries. Anyway, I ended up adding a helper method to my subclass after all. It returns a single array of keywords, which I can examine using a predicate with format (ANY keywords contains[c] %@, searchString). It works fine. Perhaps even faster than running a subquery, I dunno. F. On Mon, Jul 28, 2008 at 11:12 AM, Conrad Taylor [EMAIL PROTECTED] wrote: Hi, I would recommend taking a look at the following document. http://developer.apple.com/documentation/Cocoa/Conceptual/Predicates/predicates.html Good luck, -Conrad On Mon, Jul 28, 2008 at 1:02 AM, Fabian [EMAIL PROTECTED] wrote: Thanks. Maybe I should have made myself a little more clear. I don't want to iterate over the array, but filter the array using a NSPredicate. I'm looking at the Predicate Programming Guide, which only gives basic guidance, and the docs for NSExpression. It has several class methods that sound right (expressionForEvaluatedObject:, expressionForAggregate:, expressionForSubquery:usingIteratorVariable:predicate:, expressionForFunction:arguments:) but provides no examples how to use them. Unfortunately Google has very little to say on this subject too. To repeat the problem: I want to check the value of all keys in every dictionary contained by an array and see if they match my search string. A workaround to compensate for my syntax ignorance would be to add a new instance method to my custom class that simply return all the values I want to check in a single array. Then I could query it with a simple single-relationship predicate: NSPredicate *predicate = [NSPredicate predicateWithFormat:@(%@ IN values, searchString)]; NSArray filteredArray = [myArray filteredArrayUsingPredicate:predicate]; But somehow I believe there is a more direct way to do this, without having to add a new helper method to my class? I'm perfectly happy with a 10.5 only solution. Thanks. On Mon, Jul 28, 2008 at 8:30 AM, Graham Cox [EMAIL PROTECTED] wrote: On 28 Jul 2008, at 1:52 pm, Omar Qazi wrote: To be honest, I don't know if this will work, since I don't know if containsObject is checking if the argument is a pointer to an object in the array, or if it is equal to the object, but it's better than nothing, I guess. From the docs: containsObject: Returns a Boolean value that indicates whether a given object is present in the receiver. - (BOOL)containsObject:(id)anObject Parameters anObject An object. Return Value YES if anObject is present in the receiver, otherwise NO. Discussion This method determines whether anObject is present in the receiver by sending an isEqual: message to each of the receiver's objects (and passing anObject as the parameter to each isEqual: message). Availability • Available in Mac OS X v10.0 and later. cheers, Graham ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/conradwt%40gmail.com This email sent to [EMAIL PROTECTED] ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/slasktrattenator%40gmail.com This email sent to [EMAIL PROTECTED] ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
Need help with predicate format
Hello, I'm trying to understand how to use subquery expressions, but I just don't... :-) I have an array of MyCustomClass objects. MyCustomClass has a function that returns an array of dictionaries. I want to query all keys in each dictionary for a given string, i. e. something like (ANY SELF.function.collection.keys.value contains %@, searchString). What is the most efficient way to do this? Thanks F. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
Re: Need help with predicate format
On Jul 27, 2008, at 1:37 PM, Fabian wrote:
I want to query all keys in
each dictionary for a given string, i. e. something like (ANY
SELF.function.collection.keys.value contains %@, searchString). What
is the most efficient way to do this?
Well, NSArray has a method called containsObject: so,
for (NSDictionary *aDict in myObject.dictionaries) {
BOOL containsKey = [[aDict allKeys]containsObject:theKey];
//Do whatever you want with this
}
To be honest, I don't know if this will work, since I don't know if
containsObject is checking if the argument is a pointer to an object
in the array, or if it is equal to the object, but it's better than
nothing, I guess.
Omar Qazi
Hello, Galaxy!
1.310.294.1593
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