I have an NSArray of PFObjects and want to fetch all data related to the objects in this array in one go, so afterwards there is no need to make a new call to parse. How can I do this?
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3 Answers
My answer is assuming the array you want is contained in a PFObject. You can query for this object and use the include key to include the array contained within that key.
PFQuery *query = [PFQuery queryWithClassName:@"<object's class name>"];
[query whereKey:@"objectId" equalTo:object.objectId];
[query includeKey:@"<array key>"];
If the objects in your array have pointers to other objects within them you can use the dot syntax to fetch everything at once.
[query includeKey@"<array key>.<pointer in object from array key>"];
Run the query once set up and you should retrieve an array of one object since objectIds are unique, within this object will be the array.
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error){
if(error){
// handle error
}else{
if([objects count] > 0){
PFObject *object = objects[0]; // Only one matching object to query
NSArray *array = object[@"<array key>"]; // Array you want
}
}
}];
Comments
You can use PFObject's methods family:
+(void)fetchAll:(NSArray*)objects
Check out PFObject documentation on those methods https://parse.com/docs/ios/api/Classes/PFObject.html#//api/name/fetchAll:
Comments
As far I got your query , this might be-
PFQuery *query = [PFQuery queryWithClassName:@"CLASS_NAME"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error)
{
if (!error && objects.count != 0)
{
NSLog(@"Successfully retrieved: %@", objects);
for(int i=0; i< objects.count; i--)
{
NSDictionary *dict = [objects objectAtIndex:i];
self.label = [dict objectForKey:@"PROPERTY_KEY"]; //Just example
/* Also modify this code as per you want to fetch properties of some or all */
/* Do as you want to with properties and also change key as per need of column/property you want */
}
}
}];
This way you will get array and also fetch fetch as you want.
