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.
Related
I am using spring boot and hibernate. I have a named query where I select an item. Then I want to set some property and then to make entityManager.persist() or entityManager.merge(). Can I do this or the instance of my item will be unmanaged after the named query and persist/merge will fail ?
Here is my code where em.persist() actually do not work:
public String getSMSText(String sourceUrl) {
Rss rss;
List urls = em.createNamedQuery("Rss.getFeedByUrl").setParameter("url", sourceUrl).getResultList();
if (urls.size() != 0) {
rss = (Rss) urls.get(urls.size() - 1);
for (Rss.Item item : rss.getChannel().getItems()) {
try {
if (Utils.isToday(item.getPubDateAsDate()) && !item.isPushed()) {
item.setPushed(true);
em.refresh(item);
em.persist(item);
return item.getTitle() + "." + item.getSummary();
}
} catch (ParseException e) {
logger.info("Cannot parse pub date", e);
}
}
logger.info(sourceUrl + " No news for today!");
return null;
}
return null;
}
My guess is that your change on the item will not have any effect.
You should change your item only when the query transaction is completely closed.
I think you have two way:
1- Change your code to update your entity only when you are sure that the select query transaction was closed.
2- Use EntityManager.refresh() on your item, after the named query and before change and persist it.
I'm using Nhibernate to fetch a collection which has lazy loaded properties but am having trouble returning it as the Serializer tries to serialize the lazy property after the Nhibernate Session is closed. So is there a way to tell NHibernate to give me a true list in which if there were unloaded lazy collections that it would just leave them empty?
For example
IEnumerable<Store> stores = StoreService.GetList(1, 2);
Store has a one-to-many mapping with StockItems which is set to lazy load which then causes the serialization error. I tried
List<Store> stores_r = stores.ToList();
but I get the same thing. Is there something that will traverses through the list and fetches one-to-one relations and ignores one-to-many lazy loading and return a finished list?
Thanks
EDIT:Solution I've tried but still not working
public class NHibernateContractResolver: DefaultContractResolver
{
protected override JsonContract CreateContract(Type objectType)
{
if (typeof(NHibernate.Proxy.INHibernateProxy).IsAssignableFrom(objectType) || typeof(NHibernate.Proxy.ILazyInitializer).IsAssignableFrom(objectType))
{
var oType = objectType.GetInterfaces().FirstOrDefault(i => i.FullName.StartsWith("Navace.Models"));
return oType != null ? base.CreateContract(oType) : base.CreateContract(objectType.BaseType);
}
return base.CreateContract(objectType);
}
protected override List<MemberInfo> GetSerializableMembers(Type objectType)
{
if (typeof(NHibernate.Proxy.INHibernateProxy).IsAssignableFrom(objectType))
{
return base.GetSerializableMembers(objectType.BaseType);
}
else
{
return base.GetSerializableMembers(objectType);
}
}
}
Try to manually serialize so I can use what's happening
IEnumerable<Store> stores = StoreService.GetList(1, 2);
Store> storess = stores.ToList();
JsonSerializer sr = new JsonSerializer
{
ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
ContractResolver = new NHibernateContractResolver(),
NullValueHandling = NullValueHandling.Ignore,
};
StringWriter stringWriter = new StringWriter();
JsonWriter jsonWriter = new Newtonsoft.Json.JsonTextWriter(stringWriter);
sr.Serialize(jsonWriter, storess);
string res = stringWriter.ToString();
The error I get is
Outer exception : Error getting value from 'datedcost' on 'PartProxy'.
Inner exception: No row with the given identifier exists[Navace.Models.Part#0]
My recommendation is to return view models instead of domain models. It's confusing to return an empty collection property when it may have data. By converting the domain model to a view model (using LINQ Select or AutoMapper), the serializer will only touch (and attempt to lazy load) the properties in the view model.
I am using EF4/LINQ for the first time and have run into an issue. I am looping thru the results of a LINQ query using a foreach loop as follows:
private static void OnTimedEvent(object source, ElapsedEventArgs e)
{
CallOutcomeSubmission los = new CallOutcomeSubmission();
client = connectToService();
try
{
using (var context = new CallOutcomeContext())
{
// List of available actions
private static string ACTION_CALL_ATTEMPT = "Call Attempt";
DateTime oneDayAgo = DateTime.Now.AddHours(-24);
var query = from co in context.T_MMCallOutcome
join ca in context.T_Call on co.CallID equals ca.CallID
join lv in context.T_LeadVendorEmailHeader on co.LeadVendorEmailID equals lv.LeadVendorEmailID
where co.EnteredOn > oneDayAgo && co.MMLeadActionID == null
select new
{
co.CallOutcomeID,
co.CallID,
co.LeadVendorEmailID,
MMLeadID = lv.email_text,
ca.OutcomeID,
lv.FranchiseNumber,
co.MMLeadActionID,
co.LeadAction
};
// if any results found for query
if (query.Any())
{
foreach (var call in query.ToList())
{
// if the franchise exists
if (client.FranchiseExists(int.Parse(call.FranchiseNumber)))
{
switch (call.OutcomeID)
{
case 39: // Not Answered
call.LeadAction = ACTION_CALL_ATTEMPT;
break;
case 43: // Remove from Call List
break;
default: // If the OutcomeID is not identified in the case statement
break;
} // switch
}
else
{
los.eventLog.WriteEntry("CallOutcomeSubmission.OnTimedEvent: No franchise found with franchise ID " + call.FranchiseNumber);
}
// Save any changes currently on context
context.SaveChanges();
} // foreach
}
// if no results found from query write system log stating such
else
{
los.eventLog.WriteEntry("CallOutcomeSubmission.OnTimedEvent: No new entries found");
}
} // using
client.Close();
}
catch (System.TimeoutException exception)
{
los.eventLog.WriteEntry("CallOutcomeSubmission.OnTimedEvent:" + exception.ToString());
client.Abort();
}
catch (System.ServiceModel.CommunicationException exception)
{
los.eventLog.WriteEntry("CallOutcomeSubmission.OnTimedEvent:" + exception.ToString());
client.Abort();
}
}
When I try to do the assignment:
call.LeadAction = ACTION_CALL_ATTEMPT;
I get a build error of
Property or indexer 'AnonymousType#2.LeadAction' cannot be assigned to -- it is read only
I can't seem to find anything on this specific error doing a Google search and am not sure what I am doing wrong. Is it because the original query contains a join?
How can I do the assignment of call.LeadAction within the foreach loop?
I would also like to know if there are design issue withe way I have written the query or performed any of the operations since this is my first foray into EF/LINQ.
You're creating a new anonymous type - with the Linq joins and then trying to set that value. What you're really wanting to do, is update the call's LeadAction correct?
How would EF know to translate your new query back to an entity so it can go back to the database? It would have to go through alot of hoops, and it's not capable of that.
What you could do, is retrieve the Call from your database and set the LeadAction that way - I'm using Find, assuming that CallID is your PK:
case 39: // Not Answered
var thisCall = context.T_Call.Find(call.CallID)
thisCall.LeadAction = ACTION_CALL_ATTEMPT;
break;
I have IQueryable object and I need to take the data inside the IQueryable to put it into Textboxs controls. Is this possible?
I try something like:
public void setdata (IQueryable mydata)
{
textbox1.text = mydata.????
}
Update:
I'm doing this:
public IQueryable getData(String tableName, Hashtable myparams)
{
decimal id = 0;
if (myparams.ContainsKey("id") == true)
id = (decimal)myparams["id"];
Type myType= Type.GetType("ORM_Linq." + tableName + ", ORM_Linq");
return this.GetTable(tableName , "select * from Articu where id_tipo_p = '" + id + "'");
}
public IQueryable<T> GetTable<T>(System.Linq.Expressions.Expression<Func<T, bool>> predicate) where T : class
{
return _datacontext.GetTable<T>().Where(predicate);
}
This returns a {System.Data.Linq.SqlClient.SqlProvider+OneTimeEnumerable1[ORM_Linq.Articu]}`
I don't see any method like you tell me. I see Cast<>, Expression, ToString...
EDIT: Updated based on additional info from your other posts...
Your getData method is returning IQueryable instead of a strongly typed result, which is why you end up casting it. Try changing it to:
public IQueryable<ORM_Linq.Articu> getData(...)
Are you trying to query for "Articu" from different tables?
With the above change in place, your code can be rewritten as follows:
ORM_Linq.Articu result = mydata.SingleOrDefault();
if (result != null)
{
TextBoxCode.Text = result.id.ToString();
TextBoxName.Text = result.descrip;
}
If you have a single result use SingleOrDefault which will return a default value if no results are returned:
var result = mydata.SingleOrDefault();
if (result != null)
{
textbox1.text = result.ProductName; // use the column name
}
else
{
// do something
}
If you have multiple results then loop over them:
foreach (var item in mydata)
{
string name = item.ProductName;
int id = item.ProductId;
// etc..
}
First, you should be using a strongly-typed version of IQueryable. Say that your objects are of type MyObject and that MyObject has a property called Name of type string. Then, first change the parameter mydata to be of type IQueryable<MyObject>:
public void setdata (IQueryable<MyObject> mydata)
Then we can write a body like so to actually get some data out of. Let's say that we just want the first result from the query:
public void setdata (IQueryable<MyObject> mydata) {
MyObject first = mydata.FirstOrDefault();
if(first != null) {
textbox1.Text = first.Name;
}
}
Or, if you want to concatenate all the names:
public void setdata(IQueryable<MyObject> mydata) {
string text = String.Join(", ", mydata.Select(x => x.Name).ToArray());
textbo1.Text = text;
}
Well, as the name suggests, an object implementing IQueryable is... Queryable! You'll need to write a linq query to get at the internal details of your IQueryable object. In your linq query you'll be able to pull out its data and assign bits of it where ever you'd like - like your text box.
Here's a great starting place for learning Linq.
I think you find the same mental struggle when coming from FoxPro and from DataSet. Really nice, powerful string-based capabilities(sql for query, access to tables and columns name) in these worlds are not available, but replaced with a compiled, strongly-typed set of capabilities.
This is very nice if you are statically defining the UI for search and results display against a data source known at compile time. Not so nice if you are trying to build a system which attaches to existing data sources known only at runtime and defined by configuration data.
If you expect only one value just call FirstOrDefault() method.
public void setdata (IQueryable mydata)
{
textbox1.text = mydata.FirstOrDefault().PropertyName;
}
I have a couple of tables with similar relationship structure to the standard Order, OrderLine tables.
When creating a data context, it gives the Order class an OrderLines property that should be populated with OrderLine objects for that particular Order object.
Sure, by default it will delay load the stuff in the OrderLine property but that should be fairly transparent right?
Ok, here is the problem I have: I'm getting an empty list when I go MyOrder.OrderLines but when I go myDataContext.OrderLines.Where(line => line.OrderId == 1) I get the right list.
public void B()
{
var dbContext = new Adis.CA.Repository.Database.CaDataContext(
"<connectionString>");
dbContext.Connection.Open();
dbContext.Transaction = dbContext.Connection.BeginTransaction();
try
{
//!!!Edit: Imortant to note that the order with orderID=1 already exists
//!!!in the database
//just add some new order lines to make sure there are some
var NewOrderLines = new List<OrderLines>()
{
new OrderLine() { OrderID=1, LineID=300 },
new OrderLine() { OrderID=1, LineID=301 },
new OrderLine() { OrderID=1, LineID=302 },
new OrderLine() { OrderID=1, LineID=303 }
};
dbContext.OrderLines.InsertAllOnSubmit(NewOrderLines);
dbContext.SubmitChanges();
//this will give me the 4 rows I just inserted
var orderLinesDirect = dbContext.OrderLines
.Where(orderLine => orderLine.OrderID == 1);
var order = dbContext.Orders.Where(order => order.OrderID == 1);
//this will be an empty list
var orderLinesThroughOrder = order.OrderLines;
}
catch (System.Data.SqlClient.SqlException e)
{
dbContext.Transaction.Rollback();
throw;
}
finally
{
dbContext.Transaction.Rollback();
dbContext.Dispose();
dbContext = null;
}
}
So as far as I can see, I'm not doing anything particularly strange but I would think that orderLinesDirect and orderLinesThroughOrder would give me the same result set.
Can anyone tell me why it doesn't?
You're just adding OrderLines; not any actual Orders. So the Where on dbContext.Orders returns an empty list.
How you can still find the property OrderLines on order I don't understand, so I may be goofing up here.
[Edit]
Could you update the example to show actual types, especially of the order variable? Imo, it shoud be an IQueryable<Order>, but it's strange that you can .OrderLines into that. Try adding a First() or FirstOrDefault() after the Where.