Retrieve data from one column in one row - ios

I have a class (table) in Parse.com core data called users with username, name, surname, email and password.
I want to retrieve, for example, only the name column but I can't make this work. Here is the code:
PFQuery *query = [PFQuery queryWithClassName:#"user"]; //1
[query whereKey:#"email" equalTo:_labelEmail.text];//2
[query findObjectsInBackgroundWithBlock:^(NSArray *userData, NSError *error) {//4
if (!error) {
NSLog(#"%#", usuario);
} else {
NSString *errorString = [[error userInfo] objectForKey:#"error"];
NSLog(#"Error: %#", errorString);
}
}];
I know userData is an array not a dictionary but then how can I retrieve only the information I want? I did try to pull the userData as a dictionary instead of an array but the query does not let me do that.
What I want to do is something like:
NSLog(#"%#", userData["name"])

First I would check if your returned array is empty. If it is then no matter what you do you are not going to get the information you need out of the query.
If you are getting an error you should probably think about your query class. You are trying to query on the class "user" whereas I'm guessing you would like to query the built in _User class. To do that you would use a different kind of query:
PFQuery *query = [PFUser query];
Try this query type that Parse gives for this exact purpose and see if your returned data has any valid data. If it does you can either use:
PFUser *user = [userData objectAtIndex:0];
if you know that there should be only one user object returned to you, or you can use:
for(PFUser *user in userData)
{
//Do something with the user object that got returned to you
}

Related

Why is my NSMutable not being populated correctly when inserting objects from another NSArray?

I have a PFQuery that gets the current participants of a particular event:
PFQuery *getcurrentparticipants = [PFQuery queryWithClassName:#"Event"];
[getcurrentparticipants selectKeys:#[#"Participants"]];
[getcurrentparticipants whereKey:#"objectId" equalTo:ObjectID];
[getcurrentparticipants findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
NSMutableArray *newParticipantsArray = [[NSMutableArray alloc]init];
if([objects[0] valueForKey:#"Participants"] == nil){ // If object retrieved in objects is null. If there are 0 participants
[newParticipantsArray addObject:PFUser.currentUser.username];
PFQuery *query = [PFQuery queryWithClassName:#"Event"];
[query getObjectInBackgroundWithId:self.ObjectID
block:^(PFObject *Event, NSError *error) {
Event[#"Participants"] = newParticipantsArray;
[Event incrementKey:#"Vacants" byAmount:[NSNumber numberWithInt:-1]];
[Event saveInBackground];
}];
}else{ // STEP 5
for(int i=0;i<objects.count;i++) {
[newParticipantsArray addObject:[[objects objectAtIndex:i] valueForKey:#"Participants"]];
}
[newParticipantsArray addObject:PFUser.currentUser.username];
NSLog(#"Part to upload %#", newParticipantsArray);
PFQuery *query = [PFQuery queryWithClassName:#"Event"];
[query getObjectInBackgroundWithId:self.ObjectID
block:^(PFObject *Event, NSError *error) {
Event[#"Participants"] = newParticipantsArray;
[Event incrementKey:#"Vacants" byAmount:[NSNumber numberWithInt:-1]];
[Event saveInBackground];
}];
}
} else {
// Log details of the failure
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
This is how the method works:
Create a PFQuery object
Query the Participants Class for an specific ObjectId
If no error, then we create a NSMutable array
If no participants are in Parse then we insert the current user as participant.
Else, insert all participants in the mutable array and add currentuser at the end of the array.
Then upload it again to Parse
My problem is in step 5:
When I perform the tasks in the else, the column in Parse looks like this :
[["Participant 1"],"Participant 2"]
But I would like to have it like this:
["Participant 1","Participant 2"]
What I have tried:
I tried things like putting the arrays like this. [newParticipantsArray addObject:[[objects objectAtIndex:i] valueForKey:#"Participants"]]; and similar combinations, of course without luck.
It’s hard to say for sure since I can’t see the structure of your data but are you sure the value held in
[[objects objectAtIndex:i] valueForKey: #“Participants”]
Is a single user and not itself an array of users? The plural key “participants” seems to suggest it’s an array of users which would also explain the result you’re getting.
If in fact the value returned for the "Participants" key is an array, you can add the objects in it to your mutable array by doing the following:
NSArray* participants = [[objects objectAtIndex:i] valueForKey:#"Participants"]
[newParticipantsArray addObjectsInArray:participants];
This uses the addObjectsInArray: method of NSMutableArray to add the objects from the old array into the new one.

Query Custom User Class Parse

I'm trying to query three columns that I created in my user class with parse. I successfully saved them to the user class. But I'm having difficulty query these three columns onto a label. I really don't know where to start with the query, I want it to be user specific of course, so user A gets his name, bio, gender, ect. And name is the user's full name, not their username.
This is my code to save the objects:
- (IBAction)save:(id)sender {
PFUser *profile = [PFUser currentUser];
[profile setObject:_name.text forKey:#"Name"];
[profile setObject:_bio.text forKey:#"Bio"];
NSString *var = [[NSUserDefaults standardUserDefaults] objectForKey:#"MyKey"];
[profile setObject:var forKey:#"Gender"];
[profile saveInBackground];
}
For the query I really don't know, this is where I need help. So if you have any suggestions I would appreciate it. Thank you!
Try this one
PFQuery * query = [PFQuery queryWithClassName:#"ClassName"];
[query whereKey:#"Name" equalTo:#"XYZ"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
// objects : PFObjects
// you can filter out the data you want and print into lable
}];

Parse Set Object To UILabel

So this is my first time working with parse I have simple application which creates a user and allows them to sign in. I'm currently working on something that will allow them to fill in details about themselves using PFObjects, I don't have a problem with that. My issue is I need to get user specific data print out on an UILabel.
Here's my code creating a PFObject this works fine:
- (IBAction)saveProfile:(id)sender {
PFObject *profile = [PFObject objectWithClassName:#"Profile"];
[profile setObject: self.name.text forKey:#"name"];
[profile setObject:[PFUser currentUser] forKey:#"author"];
[profile saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (!error) {
NSLog(#"No Error");
}else NSLog(#"Yeah you got an error bro");
}];
}
Here's what I'm having an issue with my PFQuery:
PFQuery *query = [PFQuery queryWithClassName:#"Profile"];
[query whereKey:#"name" equalTo:[PFUser currentUser]];
[query getFirstObjectInBackgroundWithBlock:^(PFObject *object, NSError *error) {
if (!error) {
NSLog(#"Success");
self.nameLabel.text = [NSString stringWithFormat:#"%#", query];
}
else {
NSLog(#"Fail");
}
}];
}
So basicly I want the user to enter their name have it save, and have that specific user's name print out on a label. This is as far as I got so, if you have any suggestions I'm all ears. Thanks!
Updated:
PFQuery *query = [PFQuery queryWithClassName:#"Profile"];
[query whereKey:#"author" equalTo:[PFUser currentUser]];
[query getFirstObjectInBackgroundWithBlock:^(PFObject *object, NSError *error) {
if (!error) {
NSLog(#"Success");
self.nameLabel.text = object[#"name"];
}
else {
NSLog(#"Fails");
}
}];
}
Looks like you're setting the PFObject "name" key to self.name.text, but in your PFQuery you're querying the class and asking for values where "name" is equal to [PFUser currentUser]. You're setting the value one way then using a completely different value in an attempt to query the object; so getFirstObjectInBackgroundWithBlock isn't returning an object since there's no Profile object where "name" equals [PFUser currentUser].
I think you're confusing your "name" and "author" properties...
Edit (in response to your comment):
OK, so in saveProfile: you're creating a PFObject where you're setting "name" to the name string and "author" to the user's PFUser object. When you're using whereKey: to perform a query on this class in an effort to retrieve the object using getFirstObjectInBackgroundWithBlock:, the result returned to you will be the full first PFObject where the object associated with the key is the one specified in the whereKey: criteria. So you don't have to specify which key of the PFObject you want to read before performing getFirstObjectInBackgroundWithBlock:. The query returns the whole object -- name, author, etc.
So in order to access the returned PFObject's "name" within the query block, change:
self.nameLabel.text = [NSString stringWithFormat:#"%#", query];
to (dispatch_aync added to force the label change onto the main thread):
dispatch_async(dispatch_get_main_queue(),^{
self.nameLabel.text = object[#"name"];
});
This line
[query whereKey:#"name" equalTo:[PFUser currentUser]];
only works if the "name" column is a pointer or relation to the User class. If it is the username you're after, you need to use
[query whereKey:#"name" equalTo:[PFUser currentUser][#"username"]];
But why are you querying for the object you just saved?
Your last, updated example should work for your need.
You could fire up a query like the one below
PFQuery *query = [PFQuery queryWithClassName:#"Profile"];
NSString *nameStr = [NSString stringWithFormat:#"%#",[[PFUser currentUser]objectForKey:#"name"]];
[query whereKey:#"name" containsString:nameStr];
[query getFirstObjectInBackgroundWithBlock:^(PFObject *object, NSError *error)
{
if (!error)
{
/*object contains all columns and you need only key to obtain value*/
nameLabel = [NSString stringWithFormat:#"%#",object[#"job"];
.
.
.
}
else
{
NSLog(#"Error: %#", [error localizedDescription]);
}
}];
Now you will have object of current user along with its all details. Also you could do a thing, i.e., At time of user filling up profile details save it in a dictionary as below :
NSDictionary *signupDetail = [NSDictionary dictionaryWithObjectsAndKeys:self.userRegisterTextField.text, #"username",
self.nameTextField.text, #"Name",
[ResponseDict objectForKey:#"sessionToken"] ,#"sessionToken",
[ResponseDict objectForKey:#"objectId"], #"objectId",
nil];
//ResponseDict is dictionary you get in response for successful signup.
Then you could store it using [NSUserDefaults standardUserDefaults] so you will have all info of user at one place and call it wherever needed.

Query on Parse relational data is not coming back ordered using orderedByAscending

I'm querying relation data on parse and I would like the objects to come back ordered by the date they were created. I've had this method work before but haven't been able to get an ordered query using relational data. The query return is in a random order. Thanks in advance! Here's my code:
PFQuery *postQuery = [PFQuery queryWithClassName:#"Post"];
[roomQuery whereKey:#"name" equalTo:self.postName];
NSError *error;
//done on main thread to have data for next query
NSArray *results = [postQuery findObjects:&error];
PFObject *post;
if ([results count]) {
post = [results objectAtIndex:0];
NSLog(#"results were found");
} else {
NSLog(#"results were not found");
}
PFRelation *commentsRelation = [#"Comments"];
[commentsRelation.query orderByAscending:#"createdAt"];
[commentsRelation.query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (error) {
NSLog(#"Error Fetching Comments: %#", error);
} else {
NSArray *comments = objects;
}
I'm a little confused by your code,
you create a "postQuery", and call it, but never use any of its data.
There's also a roomQuery that never seems to have been allocated, or used.
You're querying a specific post by its name. Are you controlling its name? If not, you should use id's
what is PFRelation commentsRelation = [#"Comments"];
Probably because it's just a snippet, this stuff is dealt with elsewhere; however, for my answer, I'm assuming that your "comments" field is an array of "Comment" class objects.
Option 1:
PFQuery * postQuery = [PFQuery queryWithClassName:#"Post"];
[postQuery whereKey:#"name" equalTo:self.postName];
// again, possibly an id field would be more reliable
// [postQuery whereKey:#"objectId" equalTo:self.postId];
[postQuery includeKey:#"Comments"];
PFObject * post = [postQuery getFirstObject];// no need to download all if you just want object at [0]
// this will contain your post and all of it's comments with only one api call
// unfortunately, it's not sorted, so you would have to run a sort.
NSArray * comments = [post[#"Comments"] sortedArrayUsingComparator: ^(id obj1, id obj2) {
return [obj1[#"createdAt" compare: obj2[#"createdAt"];
}];
Option 2:
Perhaps a better option is to rework your data structure and instead of associating the comments to the post, you could associate the post to the comments (as in the parse docs)
PFQuery * postQuery = [PFQuery queryWithClassName:#"Post"];
[postQuery whereKey:#"name" equalTo:self.postName];
// again, possibly an id field would be more reliable
// [postQuery whereKey:#"objectId" equalTo:self.postId];
PFQuery * commentQuery = [PFQuery queryWithClassName:#"Comment"];
[commentsQuery whereKey:#"parent" matchesQuery:postQuery]; // when creating a comment, set your post as its parent
[commentsQuery addOrderDescending:#"createdAt"]
[commentQuery findObjectsInBackgroundWithBlock:^(NSArray *comments, NSError *error) {
// comments now contains the comments for myPost
}];
Both of the above solutions avoid making extra unnecessary api calls (parse charges based on calls after all!).

Parse.com Query if String is Contained in Array

Working with recipes and I would like to query (search) based off of items in the recipe rather than the recipe names.
For example, multiple items may contain Chicken. I want to be able to search Chicken and see the Recipe Names that contain Chicken in the recipe.
Here's what I have tried:
- (void)filterResults:(NSString *)searchTerm
{
PFQuery * query = [PFQuery queryWithClassName:self.parseClassName];
NSArray * ingredientArray = [self.profileObject objectForKey:#"ingredients"];
[query whereKey:searchTerm containedIn:ingredientArray];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (error)
{
NSLog(#"Error: %# %#", error, [error userInfo]);
}
else
{
[self.searchResults removeAllObjects];
[self.searchResults addObjectsFromArray:objects];
[self.searchDisplayController.searchResultsTableView reloadData];
}
}];
}
This code returns nothing and I get no errors.
Having difficulty figuring out the right way to set up the query.
Should this be solved as a query within a query?
Meaning:
Query through ingredients first, and then query on that to display the recipe name based on the previous query of recipes that contain the searchTerm.
I think you are misusing the [query whereKey:containedIn:] method. This is used to query for all PFObjects where the object for the key you specify is contained in the array you provide. Unless you made a new key for every recipe item, this won't work for your purposes, because none of your objects have a "Chicken" key, for instance.
First, I suggest you use a RecipeIngredient class in Parse with the following fields:
Pointer(Recipe) recipe //pointer to its Recipe object
Number amount //how much of unit
String unit //cup, gram, etc.
String ingredient //milk, flour, etc.
Now, you can simply query the RecipeIngredient class like so:
PFQuery * query = [PFQuery queryWithClassName:"RecipeIngredient"];
[query whereKey:"ingredient" equalTo:searchTerm];
[query includeKey:"recipe"]; //Fetches the Recipe data via the pointer
[query findObjectsInBackgroundWithBlock:^(NSArray *recipeIngredientObjects, NSError *error) {
if (!error) {
NSArray *recipes = [recipeIngredientObjects valueForKey:#"recipe"];
//update table data as needed
} else {
// Log details of the failure
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
I had this problem last year sometime so I thought I would share the answer.
[query whereKey:#"ingredient" matchesRegex:searchTerm modifiers:#"i"];
That should do it for you. That helps with the case sensitivity.

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