I have an entity with two fk's. I've been trying to insert a record to the database without success. This are the approaches I've used:
valuePaymentBetToAdd.BetType = db.BetTypes.First(betType => betType.Id == valuePaymentBetToAdd.BetType.Id);
valuePaymentBetToAdd.Lottery = db.Lotteries.First(lotto => lotto.Id == valuePaymentBetToAdd.Lottery.Id);
In this case the second object gets assigned but when calling the SaveChanges method I get an error saying that the properties of the Lottery object were null.
valuePaymentBetToAdd.BetTypeReference.EntityKey = new EntityKey(db.DefaultContainerName + ".BetType", "Id", valuePaymentBetToAdd.BetType.Id);
valuePaymentBetToAdd.LotteryReference.EntityKey = new EntityKey(db.DefaultContainerName + ".Lottery", "Id", valuePaymentBetToAdd.Lottery.Id);
In this case I get another weird error. When the object is being added to the collection.
The object could not be added or attached because its EntityReference has an EntityKey property value that does not match the EntityKey for this object.
Am I missing something in this case?
Try setting the EntityReference like this:
valuePaymentBetToAdd.BetTypeReference.EntityKey = b.BetTypes.First(betType => betType.Id == valuePaymentBetToAdd.BetType.Id).EntityKey;
It works for me
How about creating a stub object for BetType and Lottery where you set only the Id property, and then attach those to their respective EntitySets, and then setting these objects on you Bet object, and save - something like:
Lottery lottery = new Lottery() { Id = valuePaymentBetToAdd.Lottery.Id };
BetType betType = new BetType() { Id = valuePaymentBetToAdd.BetType.Id };
MyContext.AttachTo("Lottery", lottery);
MyContext.AttachTo("BetType", betType);
valuePaymentBetToAdd.Lottery = lottery;
valuePaymentBetToAdd.BetType = betType;
MyContext.AddToBet(valuePaymentBetToAdd);
MyContext.SaveChanges();
Related
I am trying to add a note to my event object. I am getting an error using this code
Note noteToAdd = new Note { State = State.Added, NoteText = note };
Patient patient = context.Patients.Find(patientId);
patient.State = State.Modified;
patient.MobilePatient.State = State.Modified;
patient.MobilePatient.MCalmEvents.Find(e => e.Id == eventid).Note = noteToAdd;
context.ApplyStateChanges();
Is there a better way to do it using Linq To Entity?
The error that I am having is :
{"Invalid column name 'Note_Id'."}
and the SQl that is being generated is a SELECT instead of INSERT.
Thank you
but your map shows a one-to-many relation between Note and Event...
all of your code remain as they are, but instead of this line :
patient.MobilePatient.MCalmEvents.Find(e => e.Id == eventid).Note = noteToAdd;
replace these lines:
noteToAdd.EventID = oEvent.ID; // replace field names, to exactly what they are;
context.Note.Add(noteToAdd);
var oEvent = patient.MobilePatient.MCalmEvents.Find(e => e.Id == eventid);
oEvent.NoteID = noteToAdd.ID; // replace field names, to exactly what they are;
also i think if you don`t write these two:
var oEvent = patient.MobilePatient.MCalmEvents.Find(e => e.Id == eventid);
oEvent.NoteID = noteToAdd.ID; // replace field names, to exactly what they are;
there is not any problem, i`m not sure
According to your map, Event entity has a list of Note as navigation property, and i think you should add to this collection instead, what you write in this line:
patient.MobilePatient.MCalmEvents.Find(e => e.Id == eventid).Note = noteToAdd;
i think should be like this:
patient.MobilePatient.MCalmEvents.Find(e => e.Id == eventid).Add(noteToAdd);
in addition, what kind of error you get ? can you explain your error ?
are sure there is no add method on Event navigation property
why don`t you try to add note from context directly? like:
context.Note.Add(noteToAdd);
If I load entity object and then assign one of properties to the same value as it had before, does framework detect changes or it would set IsModified flag to true anyway ?
This is how generated code for field Name looks like:
OnNameChanging(value);
ReportPropertyChanging("Name");
_Name = StructuralObject.SetValidValue(value);
ReportPropertyChanged("Name");
OnNameChanged();
I don't know which of those events set IsModified flag for that field and for the whole entity.
It looks like things are different now (EF6). I was researching this to see if I needed to use an if statement when setting property values to see if the "new value" is different. I tested with the following and the entity is not marked as modified:
var things = dbContext.Things.AsQueryable();
var thing = things.First();
string name = thing.Name;
thing.Name = name;
var entry = dbContext.Entry(thing);
var state = entry.State;
int count = dbContext.ChangeTracker.Entries().Count(e => e.State == EntityState.Modified);
var modified = entry.Property(x => x.Name).IsModified;
Your context only keeps track if your data got modified, not if it's different.
You can do a check like this:
private void CheckIfDifferent(DbEntityEntry entry)
{
if (entry.State != EntityState.Modified)
return;
if (entry.OriginalValues.PropertyNames.Any(propertyName => !entry.OriginalValues[propertyName].Equals(entry.CurrentValues[propertyName])))
return;
(this.dbContext as IObjectContextAdapter).ObjectContext.ObjectStateManager.GetObjectStateEntry(entry.Entity).ChangeState(EntityState.Unchanged);
}
source:https://stackoverflow.com/a/13515869/1339087
currently I'm Inserting like:
MyNamedEntities db = new MyNamedEntities();
MyTableEntity field = new MyTableEntity();
field.Name = "me";
db.MyTableEntity.AddObject(field);
db.SaveChanges()
But now I want to insert child elements and I need that field.Id part
MyOtherTableEntity field = new MyOtherTableEntity();
field.TableId = new MyTableEntity.First(x => x.Id.Equals( ... ));
How can I get the field.Id ?
If your table has defined the Id as an INT IDENTITY column, then you don't really have to do anything at all! :-)
In that case, just insert your entity and after the call to .SaveChanges(), your object should contain the new Id value:
MyTableEntity field = new MyTableEntity();
field.Name = "me";
db.MyTableEntity.AddObject(field);
db.SaveChanges();
int newID = field.Id;
You can also just add them to the parent by the association before or after the save changes
Something like this.
address a = new address();
a.city = "Detroit";
field.address.add(a);
db.SaveChanges();
I am having a real issue with the EF v1. I have quite a big EDMX with maybe 50 entities mapped, but this one entity is causing me grief.
The entity has mappings to other entities which in effect are reference tables, but for some reason it is trying to do an insert and not just update itself.
Here is a fragment of my code:
using (var context = new someEntities()) {
var studentCourseJoin =
context.StudentCourseJoinSet.Where(o => o.Code == scjCode).First();
studentCourseJoin.EntryStatus = new EntryStatus { Code = viewModel.StudentDetails.EntryStatusCode };
studentCourseJoin.ParentalInHigherEducation = new ParentalInHigherEducation { Code = viewModel.StudentDetails.ParentalInHigherEducationCode };
studentCourseJoin.School = new School { Code = viewModel.StudentDetails.SchoolCode };
studentCourseJoin.Institution = new Institution { Code = viewModel.StudentDetails.InstitutionCode };
studentCourseJoin.LastSchoolEndYear = viewModel.StudentDetails.LastSchoolEndYear;
studentCourseJoin.LastInstitutionEndYear = viewModel.StudentDetails.LastInstitutionEndYear;
// Blows up here trying to do an insert on the studentCourseJoin.Institution.
// But if I removed this one, then it will blow up on another one.
context.SaveChanges(true);
}
If anyone has ANY ideas please, they would help a lot.
Try adding those lines before calling SaveChanges:
ObjectStateEntry entry = context.ObjectStateManager.GetObjectStateEntry(studentCourseJoin);
entry.ChangeState(EntityState.Modified);
Update:
Try this for Institution instead:
studentCourseJoin.Institution = context.Institutions.FirstOrDefault(i => i.Code == viewModel.StudentDetails.InstitutionCode);
I am attempting to add some entities that I have created. When I try and add the entity in question to the set (see code below) I get the following error:
"The object could not be added or attached because its EntityReference has an EntityKey property value that does not match the EntityKey for this object."
I can't tell what entitykey it's referring to though. Here is the code, there is probably a much better way to pull this off as well:
public Internship CreateInternship(Internship internshipToCreate)
{
try
{
Contact contactToCreate = new Contact();
contactToCreate.Fax = internshipToCreate.contacts.Fax;
contactToCreate.Extension = internshipToCreate.contacts.Extension;
contactToCreate.FirstName = internshipToCreate.contacts.FirstName;
contactToCreate.MiddleName = internshipToCreate.contacts.MiddleName;
contactToCreate.LastName = internshipToCreate.contacts.LastName;
contactToCreate.PhoneNumber = internshipToCreate.contacts.PhoneNumber;
contactToCreate.StreetAddress = internshipToCreate.contacts.StreetAddress;
contactToCreate.PostalCode = internshipToCreate.contacts.PostalCode;
contactToCreate.ContactEmail = internshipToCreate.contacts.ContactEmail;
contactToCreate.statesReference.EntityKey =
new EntityKey("InternshipEntities.StateSet", "ID", internshipToCreate.contacts.states.ID);
contactToCreate.countriesReference.EntityKey =
new EntityKey("InternshipEntities.CountrySet", "ID", internshipToCreate.contacts.countries.ID);
_internshipEntities.AddToContactSet(contactToCreate);
_internshipEntities.SaveChanges();
try
{
Availability availabilityToCreate = new Availability();
availabilityToCreate.StartDate = internshipToCreate.availability.StartDate;
availabilityToCreate.EndDate = internshipToCreate.availability.EndDate;
availabilityToCreate.Negotiable = internshipToCreate.availability.Negotiable;
_internshipEntities.AddToAvailabilitySet(availabilityToCreate);
_internshipEntities.SaveChanges();
try
{
internshipToCreate.contactsReference.EntityKey =
new EntityKey("InternshipEntities.ContactSet", "ID", contactToCreate.ID);
internshipToCreate.availabilityReference.EntityKey =
new EntityKey("InternshipEntities.AvailabilitySet", "ID", availabilityToCreate.ID);
internshipToCreate.classificationsReference.EntityKey =
new EntityKey("InternshipEntities.ClassificationSet", "ID", internshipToCreate.classifications.ID);
internshipToCreate.educationReference.EntityKey =
new EntityKey("InternshipEntities.EducationSet", "ID", internshipToCreate.education.ID);
_internshipEntities.AddToInternshipSet(internshipToCreate); //exception here
_internshipEntities.SaveChanges();
return internshipToCreate;
}
catch(Exception e)
{
throw e;
}
}
catch(Exception e)
{
throw e;
}
}
catch(Exception e)
{
throw e;
}
}
There is no other information given besides the error when I trace through so I'm not even sure which Key is the issue.
EDIT: Here is the version that ended up working:
using (TransactionScope scope = new TransactionScope())
{
try
{
Contact contactToCreate = new Contact();
Availability availabilityToCreate = new Availability();
Internship i = new Internship();
// Set the contact entity values;
contactToCreate.Fax = internshipToCreate.contacts.Fax;
//...
//ommited for brevity
//...
contactToCreate.ContactEmail = internshipToCreate.contacts.ContactEmail;
// Set the contact entity references to existing tables
contactToCreate.statesReference.EntityKey =
new EntityKey("InternshipEntities.StateSet", "ID", internshipToCreate.contacts.states.ID);
contactToCreate.countriesReference.EntityKey =
new EntityKey("InternshipEntities.CountrySet", "ID", internshipToCreate.contacts.countries.ID);
// Add contact
_internshipEntities.AddToContactSet(contactToCreate);
// Set the availability entity values;
availabilityToCreate.StartDate = internshipToCreate.availability.StartDate;
availabilityToCreate.EndDate = internshipToCreate.availability.EndDate;
availabilityToCreate.Negotiable = internshipToCreate.availability.Negotiable;
// Add availability
_internshipEntities.AddToAvailabilitySet(availabilityToCreate);
//Add contact and availability entities to new internship entity
i.contacts = contactToCreate;
i.availability = availabilityToCreate;
// Set internship entity values;
i.UserID = internshipToCreate.UserID;
//...
//ommited for brevity
//...
i.Created = DateTime.Now;
// Set the internship entity references to existing tables
i.classificationsReference.EntityKey =
new EntityKey("InternshipEntities.ClassificationSet", "ID", internshipToCreate.classifications.ID);
i.educationReference.EntityKey =
new EntityKey("InternshipEntities.EducationSet", "ID", internshipToCreate.education.ID);
// Add internship and save
_internshipEntities.AddToInternshipSet(i);
_internshipEntities.SaveChanges();
//commit transaction
scope.Complete();
return internshipToCreate;
}
catch (Exception e)
{
throw e;
}
}
Hallo,
although I'm not sure what the problem is I have a suggestion. The Internship object that you are passing into method (internshipToCreate) is used to transfer values to other entities (Contact, Availability) that you instantiated inside of the method, and their creation works just fine.
Maybe you should try to do the same with Internship? Create new Internship object and set all values you have by taking them from internshipToCreate object, and than that newly created object pass to the _internshipEntities.AddToInternshipSet method.
It is possible that you've set some values on internshipToCreate object that you needed for other purposes, and that some of those is actually causing the exception.
And, I don't know what you business logic is, but it would be better if you put all under one transaction, because like this it may happen that first two entities are created, and third one not.
This code isn't making a lot of sense to me. In two cases, you're going through an EntityKey when you could just assign an object reference. I.e, change this:
internshipToCreate.contactsReference.EntityKey =
new EntityKey("InternshipEntities.ContactSet", "ID", contactToCreate.ID);
internshipToCreate.availabilityReference.EntityKey =
new EntityKey("InternshipEntities.AvailabilitySet", "ID", availabilityToCreate.ID);
...to:
internshipToCreate.contacts = contactToCreate;
internshipToCreate.availability = availabilityToCreate;
In the other two cases you seem to be attempting to assign the ID of the object which is already there. These two lines, even if successful, it seems to me, would do nothing:
internshipToCreate.classificationsReference.EntityKey =
new EntityKey("InternshipEntities.ClassificationSet", "ID", internshipToCreate.classifications.ID);
internshipToCreate.educationReference.EntityKey =
new EntityKey("InternshipEntities.EducationSet", "ID", internshipToCreate.education.ID);
So you can just get rid of them.
What happens when you make these two changes?