Database Reference
In-Depth Information
Now that you're acquainted with the count result type, let's quickly implement the
count for the second price category filter.
Add the following lazy property below the first one you added earlier:
lazy
var
moderateVenuePredicate:
NSPredicate
= {
var
predicate =
NSPredicate
(format:
"priceInfo.priceCategory == %@"
,
"$$"
)
return
predicate
}()
This
NSPredicate
is almost identical to the cheap venue predicate, except that this
one matches against $$ instead of $.
Similarly, add the following method below
populateCheapVenueCountLabel
:
func
populateModerateVenueCountLabel() {
// $$ fetch request
let
fetchRequest =
NSFetchRequest
(entityName:
"Venue"
)
fetchRequest.
resultType
= .CountResultType
fetchRequest.
predicate
=
moderateVenuePredicate
var
error:
NSError
?
let
result =
coreDataStack
.
context
.
executeFetchRequest
(fetchRequest,
error: &error)
as
[
NSNumber
]?
if
let
countArray = result {
let
count = countArray[
0
].
integerValue
secondPriceCategoryLabel
.
text
=
"
\(count)
bubble tea places"
}
else
{
println
(
"Could not fetch
\(error)
,
\(error!.
userInfo
)
"
)
}
}
Finally, modify
viewDidLoad
to invoke your newly defined method:
override
func
viewDidLoad() {
super
.
viewDidLoad
()
populateCheapVenueCountLabel
()
