If we are dealing with the current user, it is easy by doing:
ParseAnonymousUtils.isLinked(ParseUser.getCurrentUser());
But what if I just have bunch of usernames? How can I determine which ones are anonymous? I have tried querying the User table like this:
ParseQuery<ParseUser> queryUser = new ParseUser().getQuery();
queryUser.whereEqualTo("User", usernameString);
queryUser.setLimit(1);
queryUser.findInBackground(new FindCallback<ParseUser>() {
#Override
public void done(List<ParseUser> users, ParseException e) {
if (e == null) {
if (users != null) {
for (ParseUser user : users) {
// do a check
}
}
}
}
}
And tried different ways to do the check but nothing seems to work. For example:
ParseAnonymousUtils.isLinked(user)
always returns false. I have also tried accessing the authData as String:
String authData = user.getString("authData");
if (authData == null) Log.i("authData", "null");
else Log.i("authData", authData);
but always get null. I have also tried casting it as JSONObject hoping to see if I can determine if an anonymous field exists in the JSON:
JSONObject authDataJson = (JSONObject) user.get("authData");
but also always get null.
How can I determine if any given username belongs to an anonymous user? Thanks
Related
From my previous question: Hibernate: Cannot fetch data back to Map<>, I was getting NullPointerException after I tried to fetch data back. I though the reason was the primary key (when added to Map as put(K,V), the primary key was null, but after JPA persist, it created the primary key and thus changed the HashMap()). I had this equals and hashCode:
User.java:
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof User)) return false;
User user = (User) o;
return Objects.equals(id, user.id) && Objects.equals(username, user.username) && Objects.equals(about, user.about) && Objects.equals(friendships, user.friendships) && Objects.equals(posts, user.posts);
}
#Override
public int hashCode() {
return Objects.hash(id, username, about, friendships, posts);
}
-> I used all fields in the calculation of hash. That made the NullPointerException BUT not because of id (primary key), but because of collections involved in the hash (friends and posts). So I changed both functions to use only database equality:
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (id == null) return false;
if (!(o instanceof User)) return false;
User user = (User) o;
return this.id.equals(user.getId());
}
#Override
public int hashCode() {
return id == null ? System.identityHashCode(this) :
id.hashCode();
So now only the id field is involved in the hash. Now, it didn't give me NullPointerException for fetched data. I used this code to test it:
(from User.java):
public void addFriend(User friend){
Friendship friendship = new Friendship();
friendship.setOwner(this);
friendship.setFriend(friend);
this.friendships.put(friend, friendship);
}
DemoApplication.java:
#Bean
public CommandLineRunner dataLoader(UserRepository userRepo, FriendshipRepository friendshipRepo){
return new CommandLineRunner() {
#Override
public void run(String... args) throws Exception {
User f1 = new User("friend1");
User f2 = new User("friend2");
User u1 = new User("user1");
System.out.println(f1);
System.out.println(f1.hashCode());
u1.addFriend(f1);
u1.addFriend(f2);
userRepo.save(u1);
User fetchedUser = userRepo.findByUsername("user1");
System.out.println(fetchedUser.getFriendships().get(f1).getFriend());
System.out.println(fetchedUser.getFriendships().get(f1).getFriend().hashCode());
}
};
}
You can see I am
puting the f1 User into friendship of user1 (owner of the friendship). The time when the f1.getId() == null
saving the user1. The time when the f1 id gets assign its primary key value by Hibernate (because the friendship relation is Cascade.All so including the persisting)
Fetching the f1 User back by geting it from the Map, which does the look-up with the hashCode, which is now broken, because the f1.getId() != null.
But even then, I got the right element. The output:
User{id=null, username='friend1', about='null', friendships={}, posts=[]}
-935581894
...
User{id=3, username='friend1', about='null', friendships={}, posts=[]}
3
As you can see: the id is null, then 3 and the hashCode is -935581894, then 3... So how is possible I was able to get the right element?
Not all Map implementation use the hashCode (for example a TreeMap implementation do not use it, and rather uses a Comparator to sort entries into a tree).
So i would first check that hibernate is not replacing the field :
private Map<User, Friendship> friendships = new HashMap<>();
with its own implementation of Map.
Then, even if hibernate keeps the HashMap, and the hashcode of the object changed, you might be lucky and both old and new hashcodes gives the same bucket of the hashmap.
As the object is the same (the hibernate session garantees that), the equals used to find the object in the bucket will work. (if the bucket has more than 8 elements, instead of the bucket being a linked list, it will be a b-tree ordered on hashcode, in that case it won't find your entry, but the map seems to have only 2-3 elements so it can't be the case).
Now I understood your question.
Looking at the Map documentation we read the following:
Note: great care must be exercised if mutable objects are used as map
keys. The behavior of a map is not specified if the value of an object
is changed in a manner that affects equals comparisons while the
object is a key in the map.
It looks like there is no definitive answer for this and as #Thierry already said it seems that you just got lucky. The key takeaway is "do not use mutable objects as Map keys".
Im trying to query all elements of subclass in Unity. I have found SDK constraint or missing something here.
According to documentation querying subclasses is possible.
> var query = new ParseQuery<Armor>()
.WhereLessThanOrEqualTo("rupees", ((Player)ParseUser.CurrentUser).Rupees);
query.FindAsync().ContinueWith(t =>
{
IEnumerable<Armor> result = t.Result;
});
Im however using relation table and cannot specify
Here is my code:
IEnumerator LoadMyDesigns(Action<RequestResult> result) {
ParseUser user = ParseUser.CurrentUser;
ParseRelation<Design> relation = user.GetRelation<Design>("designs");
Task<IEnumerable<Design>> task = relation.Query.FindAsync();
while (!task.IsCompleted) yield return new WaitForEndOfFrame();
if (task.IsFaulted) {
//error
foreach(var e in task.Exception.InnerExceptions) {
ParseException parseException = (ParseException) e;
Debug.LogError("Error message " + parseException.Message);
Debug.LogError("Error code: " + parseException.Code);
result(new RequestResult(true, parseException.Message));
}
}
else {
result(new RequestResult(true, new List<Design>(task.Result)));
}
}
And error:
ArgumentNullException: Must specify a ParseObject class name when creating a ParseQuery.
So the question is how do I specify query subclass type when using relations?
Thanks.
I've struggled with the same problem and in my case I needed to provide the propertyName again in de GetRelationProperty call.
For example:
[ParseFieldName("designs")]
public ParseRelation<Design> Designs
{
get { return GetRelationProperty<Design>("Designs"); }
}
Try querying your designs Table.
Make a new query for class "Designs" where equal("owner", PFUser.currentUser())
This should return all of the designs for the current User.
I have a Synchronous plugin that runs when any opportunity create/delete/update. And in Plugin if any error comes i have made a function which insert log into database.
In table one field if EntityId, so i am writing the following code :
foreach (PropertyBagEntry entry in (IEnumerable<PropertyBagEntry>)context.InputParameters.Values)
{
DynamicEntity entity = (DynamicEntity)entry.Value;
foreach (Property property in (IEnumerable<Property>)entity.Properties)
{
if (property.GetType().Name == "KeyProperty")
{
str4 = ((Key)entity.Properties[property.Name]).Value.ToString();
break;
}
}
}
In str4 i am getting EntityId of current process.
But it gives one exception very frequently :
Unhandled Exception: System.InvalidCastException: Unable to cast object of type
'ValueCollection[System.String,System.Object]'
to type 'System.Collections.Generic.IEnumerable`1[Microsoft.Crm.Sdk.PropertyBagEntry]'
And i have identified that the following line is giving error
foreach (PropertyBagEntry entry in (IEnumerable)context.InputParameters.Values)
Anyone have idea to convert this line in another way ?
My understanding is that you want to get the GUID of current record, if this is the case then you can do it as:
public void Execute(IServiceProvider serviceProvider)
{
IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));
try
{
if (context.MessageName == "Create" || context.MessageName == "Update")
{
if (context.InputParameters.Contains("Target") && (context.InputParameters["Target"] is Entity))
{
Entity currentEntity = (Entity) context.InputParameters["Target"];
Guid currentRecordGuid = currentEntity.Id;
}
}
}
catch (Exception ex)
{
}
}
I believe the type of that collection varies from one message to another. If you are looking to get the Id of the record within a plugin, this helper function may come in handy:
public static Guid GetEntityIdFromContext(IPluginExecutionContext context)
{
string messageName = context.MessageName;
if (context.PrimaryEntityId != Guid.Empty)
{
return context.PrimaryEntityId;
}
else if (messageName == "Create")
{
return new Guid(context.OutputParameters["id"].ToString());
}
else
{
return context.PrimaryEntityId;
}
}
If that doesn't help, would you mind providing the message that causes the error?
If
Unhandled Exception: System.InvalidCastException: Unable to cast
object of type 'ValueCollection[System.String,System.Object]' to type
'System.Collections.Generic.IEnumerable`1[Microsoft.Crm.Sdk.PropertyBagEntry]'
is truly your error, than your issue is not with line
foreach (Property property in (IEnumerable<Property>)entity.Properties)
but with line:
foreach (PropertyBagEntry entry in (IEnumerable<PropertyBagEntry>)context.InputParameters.Values)
The type of context.InputParameters.Values is not castable to an IEnumerable
I'm trying to get some data from a database whose results can be more than one row.
I've the following code for that:
public System.Linq.IQueryable<Users> getUser2(string idUser)
{
try
{
using (Entities c = new Entities())
{
c.ContextOptions.LazyLoadingEnabled = false;
c.ContextOptions.ProxyCreationEnabled = false;
return c.Users.Include("Empresas").Where(x => x.Login == idUser && x.Empresas.Activa == true);
}
}
catch (Exception ex)
{
throw ex;
}
}
But it doesn't seem to get any result, it shows something like a badly formed Iqueryable, I mean if I expand its results view I can see a message that says "ObjectContext instance has been eliminated and cannot be used for operations that need a connection" If I try to access any Users element with the function ElementAt(index) I get an IndexOutOfBounds error as it looks like it has no data if watched on debug mode.
I've deduced that it's Where fault because this code Works fine in returning the first user it finds that fulfills the condition:
public Users getUser(string idUser)
{
try
{
using (Entities c = new Entities())
{
c.ContextOptions.LazyLoadingEnabled = false;
c.ContextOptions.ProxyCreationEnabled = false;
return c.Users.Include("Empresas").FirstOrDefault(x => x.Login == idUser && x.Empresas.Activa == true);
}
}
catch (Exception ex)
{
throw ex;
}
}
Does that Where work differently than what I think I should? If then, how could I get several data that fulfills the conditions I'm passing the same as in getUser but for several rows?
Thanks for your attention.
You need to enumerate the result, so after the "where" statement add. ToList() which will enumerate and execute the query against your database. FirstOrDefault is executing the query thats why you get a result.
You need to check the deferred methods and understand how they work.
EDIT
The following are some links to show you the deference between the Deferred method vs Immediate methods in LINQ
1- http://www.dotnetcurry.com/showarticle.aspx?ID=750
2- http://www.codeproject.com/Articles/627081/LINQ-Deferred-Execution-Lazy-Evaluation
3- http://visualcsharptutorials.com/linq/deferred-execution
Hope that helps.
Currently I'm developing an OAuth2 authorization server using DotNetOpenAuth CTP version. My authorization server is in asp.net MVC3, and it's based on the sample provided by the library. Everything works fine until the app reaches the point where the user authorizes the consumer client.
There's an action inside my OAuth controller which takes care of the authorization process, and is very similar to the equivalent action in the sample:
[Authorize, HttpPost, ValidateAntiForgeryToken]
public ActionResult AuthorizeResponse(bool isApproved)
{
var pendingRequest = this.authorizationServer.ReadAuthorizationRequest();
if (pendingRequest == null)
{
throw new HttpException((int)HttpStatusCode.BadRequest, "Missing authorization request.");
}
IDirectedProtocolMessage response;
if (isApproved)
{
var client = MvcApplication.DataContext.Clients.First(c => c.ClientIdentifier == pendingRequest.ClientIdentifier);
client.ClientAuthorizations.Add(
new ClientAuthorization
{
Scope = OAuthUtilities.JoinScopes(pendingRequest.Scope),
User = MvcApplication.LoggedInUser,
CreatedOn = DateTime.UtcNow,
});
MvcApplication.DataContext.SaveChanges();
response = this.authorizationServer.PrepareApproveAuthorizationRequest(pendingRequest, User.Identity.Name);
}
else
{
response = this.authorizationServer.PrepareRejectAuthorizationRequest(pendingRequest);
}
return this.authorizationServer.Channel.PrepareResponse(response).AsActionResult();
}
Everytime the program reaches this line:
this.authorizationServer.Channel.PrepareResponse(response).AsActionResult();
The system throws an exception which I have researched with no success. The exception is the following:
Only parameterless constructors and initializers are supported in LINQ to Entities.
The stack trace: http://pastebin.com/TibCax2t
The only thing I've done differently from the sample is that I used entity framework's code first approach, an I think the sample was done using a designer which autogenerated the entities.
Thank you in advance.
If you started from the example, the problem Andrew is talking about stays in DatabaseKeyNonceStore.cs. The exception is raised by one on these two methods:
public CryptoKey GetKey(string bucket, string handle) {
// It is critical that this lookup be case-sensitive, which can only be configured at the database.
var matches = from key in MvcApplication.DataContext.SymmetricCryptoKeys
where key.Bucket == bucket && key.Handle == handle
select new CryptoKey(key.Secret, key.ExpiresUtc.AsUtc());
return matches.FirstOrDefault();
}
public IEnumerable<KeyValuePair<string, CryptoKey>> GetKeys(string bucket) {
return from key in MvcApplication.DataContext.SymmetricCryptoKeys
where key.Bucket == bucket
orderby key.ExpiresUtc descending
select new KeyValuePair<string, CryptoKey>(key.Handle, new CryptoKey(key.Secret, key.ExpiresUtc.AsUtc()));
}
I've resolved moving initializations outside of the query:
public CryptoKey GetKey(string bucket, string handle) {
// It is critical that this lookup be case-sensitive, which can only be configured at the database.
var matches = from key in db.SymmetricCryptoKeys
where key.Bucket == bucket && key.Handle == handle
select key;
var match = matches.FirstOrDefault();
CryptoKey ck = new CryptoKey(match.Secret, match.ExpiresUtc.AsUtc());
return ck;
}
public IEnumerable<KeyValuePair<string, CryptoKey>> GetKeys(string bucket) {
var matches = from key in db.SymmetricCryptoKeys
where key.Bucket == bucket
orderby key.ExpiresUtc descending
select key;
List<KeyValuePair<string, CryptoKey>> en = new List<KeyValuePair<string, CryptoKey>>();
foreach (var key in matches)
en.Add(new KeyValuePair<string, CryptoKey>(key.Handle, new CryptoKey(key.Secret, key.ExpiresUtc.AsUtc())));
return en.AsEnumerable<KeyValuePair<string,CryptoKey>>();
}
I'm not sure that this is the best way, but it works!
It looks like your ICryptoKeyStore implementation may be attempting to store CryptoKey directly, but it's not a class that is compatible with the Entity framework (due to not have a public default constructor). Instead, define your own entity class for storing the data in CryptoKey and your ICryptoKeyStore is responsible to transition between the two data types for persistence and retrieval.