I chose to put a complete example of my code in order to demonstrate what I exactly need. Briefly, what I would like to do, is to get a generic code in public override int SaveChanges() that could work to all entities that implements a translation rather than write a one-by-one.
ENTITIES
public partial class EntityOne
{
public long EntityOneId { get; set; }
public string SomeProperty { get; set; }
public virtual ICollection<EntityOneTranslation> EntityOneTranslations { get; set; }
public EntityOne()
{
this.EntityOneTranslations = new HashSet<EntityOneTranslation>();
}
}
public class EntityOneTranslation : EntityTranslation<long, EntityOne>
{
public string LocalizedEntityOneProp1 { get; set; }
public string LocalizedEntityOneProp1 { get; set; }
}
public partial class EntityTwo
{
public long EntityTwoId { get; set; }
public string SomeProperty { get; set; }
public virtual ICollection<EntityTwoTranslation> EntityTwoTranslations { get; set; }
public EntityTwo()
{
this.EntityTwoTranslations = new HashSet<EntityTwoTranslation>();
}
}
public class EntityTwoTranslation : EntityTranslation<long, EntityTwo>
{
public string LocalizedEntityTwoProp1 { get; set; }
public string LocalizedEntityTwoProp2 { get; set; }
}
public class EntityTranslation<TEntityKey, TEntity> : ILanguage
{
[Key, Column(Order = 0), ForeignKey("Entity")]
public TEntityKey EntityKey { get; set; }
[Key, Column(Order = 1), ForeignKey("Language")]
public long LanguageId { get; set; }
public virtual TEntity Entity { get; set; }
public virtual Language Language { get; set; }
}
INTERFACE
public interface ILanguage
{
long LanguageId { get; set; }
}
Here is the target
How would I get the entity navigation property using reflection/or something in order to reuse my code that could work too all entities that has a translation property collection?
I already tried to ask the same thing from 2 other posts, but I didn't give all the info. I guess that's why nobody could give me the expected answer.
Adding new entries over entity navigation property collection
Cast PropertyInfo to Collection
SAVE CHANGES OVERRIDE
public override int SaveChanges()
{
foreach (var entityOneEntry in ChangeTracker.Entries<EntityOne>())
{
if (entityOneEntry.State == EntityState.Added)
{
//Get entity localized properties values of current language.
var currentLanguageEntry = entityOneEntry.Entity.EntityOneTranslations.FirstOrDefault();
var localizedEntityOneProp1 = currentLanguageEntry.LocalizedEntityOneProp1;
var localizedEntityOneProp2 = currentLanguageEntry.LocalizedEntityOneProp2;
//Get all languages but the current one.
var languages = Language.Where(l => l.LanguageId != currentCulture.Key);
//Add missing translations copying the same values.
foreach (var language in languages)
entityOneEntry.Entity.EntityOneTranslations.Add(new EntityOne()
{
LanguageId = language.LanguageId,
LocalizedEntityOneProp1 = localizedEntityOneProp1,
LocalizedEntityOneProp2 = localizedEntityOneProp2
});
}
}
foreach (var entityOneEntry in ChangeTracker.Entries<EntityTwo>())
{
if (entityOneEntry.State == EntityState.Added)
{
//Get entity localized properties values of current language.
var currentLanguageEntry = entityOneEntry.Entity.EntityTwoTranslations.FirstOrDefault();
var localizedEntityTwoProp1 = currentLanguageEntry.LocalizedEntityTwoProp1;
var localizedEntityTwoProp2 = currentLanguageEntry.LocalizedEntityTwoProp2;
//Get all languages but the current one.
var languages = Language.Where(l => l.LanguageId != currentCulture.Key);
//Add missing translations copying the same values.
foreach (var language in languages)
entityOneEntry.Entity.EntityTwoTranslations.Add(new EntityTwo()
{
LanguageId = language.LanguageId,
LocalizedEntityTwoProp1 = localizedEntityTwoProp1,
LocalizedEntityTwoProp2 = localizedEntityTwoProp2
});
}
}
}
Related
When trying to create a new database entry of type TestForm2 I include the related object Unit Type's ID as a foreign key, except when I perform context.SaveChanges() after adding the new model I get the following SQL exception:
SqlException: Violation of PRIMARY KEY constraint 'PK_dbo.UnitTypes'. Cannot insert duplicate key in object 'dbo.UnitTypes'. The duplicate key value is (2d911331-6083-4bba-a3ad-e50341a7b128). The statement has been terminated.
What this means to me is that it thinks that the foreign entry I'm trying to relate to the new model is instead a new object that it's attempting to insert into the UnitTypes table and failing because it sees an existing entry with the same primary key.
For context (pun not intended), this is my data context, the database model, and the erroring "Create" function.
public class DataContext : IdentityDbContext<ApplicationUser>
{
public DataContext() : base("DefaultConnection")
{
}
public static DataContext Create()
{
return new DataContext();
}
public DbSet<SafetyIncident> SafetyIncidents { get; set; }
public DbSet<ProductionLine> ProductionLines { get; set; }
public DbSet<ProductionOrder> ProductionOrders { get; set; }
public DbSet<SerialOrder> SerialOrder { get; set; }
public DbSet<QualityError> QualityErrors { get; set; }
public DbSet<PSA> PSAs { get; set; }
public DbSet<TestStation> TestStations { get; set; }
public DbSet<ProductionGoal> ProductionGoals { get; set; }
public DbSet<DailyWorkStationCheck> DailyWorkStationChecks { get; set; }
public DbSet<TestForm> TestForms { get; set; }
public DbSet<User> AppUsers { get; set; }
public DbSet<Options> Options { get; set; }
public DbSet<DriveList> DriveSerials { get; set; }
public DbSet<MRPController> MRPControllers { get; set; }
public DbSet<TestOption> TestOptions { get; set; }
public DbSet<UnitType> UnitTypes { get; set; }
public DbSet<UnitTypeMap> UnitTypeMaps { get; set; }
public DbSet<TestForm2> TestForm2s { get; set; }
public DbSet<TestFormSection> TestFormSections { get; set; }
public DbSet<TestFormSectionStep> TestFormSectionSteps { get; set; }
}
public class TestForm2 : BaseEntity
{
public string SerialNumber { get; set; }
public string MaterialNumber { get; set; }
public string UnitTypeId { get; set; }
public UnitType UnitType { get; set; }
public bool UsesStandardOptions { get; set; }
public bool OptionsVerified { get; set; } // This will only be used when UsesStandardOptions is true, otherwise its value doesn't matter
public ICollection<TestOption> AllOptions { get; set; } // List of all options (at time of form creation)
public ICollection<TestOption> Options { get; set; } // The options on a unit
public ICollection<TestFormSection> Sections { get; set; }
}
public FormViewModel Create(FormViewModel vm)
{
using (var context = new DataContext())
{
List<string> optionListStrings = GetOptionListForModelNumber(vm.MaterialNumber); // returns list of option codes
List<TestOption> matchingOptions = context.TestOptions
.Where(optionInDb =>
optionListStrings.Any(trimOption => trimOption == optionInDb.OptionCode)).ToList();
var unitType = context.UnitTypes.FirstOrDefault(x => x.Name == vm.UnitType);
string unitTypeId = unitType.Id;
TestForm2 newForm = new TestForm2
{
// ID & CreatedAt instantiated by Base Entity constructor
SerialNumber = vm.SerialNumber,
MaterialNumber = vm.MaterialNumber,
UnitTypeId = unitType.Id,
UsesStandardOptions = vm.UsesStandardOptions,
OptionsVerified = vm.OptionsVerified,
//AllOptions = context.TestOptions.ToList(),
//Options = matchingOptions,
Sections = vm.Sections,
};
context.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);
context.TestForm2s.Add(newForm);
context.SaveChanges(); // THIS IS WHERE THE SQL EXCEPTION IS HAPPENING
return vm;
}
return null;
}
Lastly, I'm not sure if it's relevant, but a full copy of the related UnitType is viewable as part of newForm only after context.TestForm2s.add(newForm) resolves. This is weird to me since I don't think it should be automatically relating the data object like that.
I haven't been able to try much since everything looks properly configured to me. Please let me know if this is not the case or if I should include any other info.
Found the issue. The vm.Sections was not using viewmodels to contain the section data, so the vm.Sections contained UnitType database models. Since this was instantiated in the controller (before opening the data context in the TestForm2 Create method) EF assumed that these data were new and needed to be added to the UnitType table.
Hope this thread helps someone else running into similar issues.
I am struggling a bit to wrap my head around Entity Framework and It's driving me crazy. I have an target object that I'd like to populate:
public class ApiInvitationModel
{
public int Id { get; set; }
public EventModel Event { get; set; }
public UserModel InvitationSentTo { get; set; }
public UserModel AttendingUser { get; set; }
}
The schemas of the above models are:
public class EventModel {
public int Id? { get; set; }
public string Name { get; set; }
public DateTime? StartDate { get; set; }
public DateTime? EndDate { get; set }
public OrganizationModel HostingOrganization { get; set; }
public Venue Venue { get; set; }
public string Price { get; set; }
}
public class UserModel {
public int Id? { get; set; }
public string Name { get; set; }
public string PhoneNumber { get; set; }
public string MobileNumber { get; set; }
public List<OrganizationModel> Organizations { get; set; }
}
public class OrganizationModel {
public int Id? { get; set; }
public stirng Name { get; set; }
public string Address { get; set; }
public UserModel PrimaryContact { get; set; }
}
The above schemas are simplified for the purpose of the question and are the models we intend to return via API.
The problem is the origin schemas in the database is very different and I'm trying to map the database objects to these objects via Entity Framework 6.
My attempted solution was to try and nest the models via a query but that didn't work and I'm not sure where to go from here besides making numerous calls to the database.
public List<ApiInvitationModel> GetInvitations(int userId) {
using (var entities = new Entities()) {
return entities.EventInvitations
.Join(entities.Users, invitation => invitiation.userId, user => user.id, (invitation, user) => new {invitation, user})
.Join(entities.Events, model => model.invitation.eventId, ev => ev.id, (model, ev) => new {model.invitation, model.user, ev})
.Join(entities.organization, model => model.user.organizationId, organization => organization.id, (model, organization) => new ApiInvitationModel
{
Id = model.invitation.id,
Event = new EventModel {
Id = model.event.id,
Name = model.event.name,
StartDate = model.event.startDate,
EndDate = model.event.endDate,
HostingOrganization = new OrganizationModel {
Id = model.invitation.hostingId,
Name = model.event.venueName,
Address = model.event.address,
PrimaryContact = new UserModel {
Name = model.event.contactName,
PhoneNumber = model.event.contactNumber,
}
}
...
},
InvitedUser = {
}
}
).ToList();
}
}
As you can see above, there's quite a bit of nesting going on but this doesn't work in Entity Framework 6 as far as I am aware. I keep getting the following errors:
"The type 'Entities.Models.API.UserModel' appears in two structurally incompatible initializations within a single LINQ to Entities query. A type can be initialized in two places in the same query, but only if the same properties are set in both places and those properties are set in the same order.",
Based on the above error, I assumed that each of the model initiatilizations would need to be the same (i.e. initializing the values as the same ApiInvitationModel in each join in the same order) but that produces the same error.
What would be the best approach to handling this, keepign in mind the source database doesn't have foreign keys implemented?
I have the following BaseballDbContext class:
public class BaseballDbContext : DbContext
{
public DbSet<BaseballTeam> teams { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Hitter>();
modelBuilder.Entity<Pitcher>();
}
}
And my model classes are:
public class BaseballTeam
{
public int Id { get; set; }
public string teamName { get; set; }
public List<BaseballPlayer> players { get; set; }
}
public abstract class BaseballPlayer
{
public int Id { get; set; }
public int age { get; set; }
public string name { get; set; }
}
public class Hitter : BaseballPlayer
{
public int homeruns { get; set; }
}
public class Pitcher : BaseballPlayer
{
public int strikeouts { get; set; }
}
Initially seeded data in the players table:
Now I want to update name and homeruns property of one of the hitters:
BaseballTeam team = _ctx.teams.Include(q => q.players).FirstOrDefault();
Hitter hitter = team.players.OfType<Hitter>().FirstOrDefault();
hitter.name = "Tulowitzki"; //that property will be updated
hitter.homeruns = 399; //but that will not :(
int i = team.players.FindIndex(q => q.Id == hitter.Id);
team.players[i] = hitter;
_ctx.Update(team);
_ctx.SaveChanges();
After I run the code only player's name got update, but not the homeruns property:
How to update property of both child and parent class ?
From this answer but this is a workaround: Save changes to child class properties using base class query with Entity Framework TPH patten :
Do Not track changes using AsNoTracking()
using (var context = new BaseballDbContext())
{
var team = context.teams.Include(q => q.players).AsNoTracking().FirstOrDefault();
var hitter = team.players.OfType<Hitter>().FirstOrDefault();
hitter.name = "Donaldson";
hitter.homeruns = 999;
context.Update(team);
context.SaveChanges();
}
I think you should have a look at the opened issues related to inheritance and may be open a new issue
I am having troubles trying to figure out how to use the EF6 interceptors to set a value on Insert/Update.
What I wanted to do is to have an interceptor to automatically create a new instance of Audit like so:
public class FooContext : DbContext
{
public DbSet<Invoice> Invoices { get; set; }
public DbSet<Audit> Audits { get; set; }
}
public class Invoice
{
public int Id { get; set; }
public string Name { get; set; }
public Audit AuditAndConcurrencyKey { get; set; }
}
public class InvoiceItem
{
public int Id { get; set; }
public Invoice Header { get; set; }
public string Name { get; set; }
public decimal Price { get; set; }
//For legacy reasons. I know this design is wrong :(
public Audit AuditAndConcurrencyKey { get; set; }
}
public class Audit
{
public int Id { get; set; }
public int InstanceId { get; set; }
public string Message { get; set; }
}
[Test]
public void WillCreateAudit()
{
using (var db = new FooContext())
{
var inv = new Invoice {Name = "Foo Invoice"};
var invLine = new InvoiceItem {Header = inv, Price = 1, Name = "Apple"};
db.Invoices.Add(inv);
db.SaveChanges();
//Inceptors should figure out that we are working with "Invoice" and "InvoiceLine"
//And automatically create an "Audit" instance
Assert.That(inv.AuditAndConcurrencyKey != null);
Assert.That(invLine.AuditAndConcurrencyKey != null);
Assert.That(inv.AuditAndConcurrencyKey == invLine.AuditAndConcurrencyKey)
}
}
The first thing I checked is this example for SoftDeleteInterceptor. I don't think this is what I want because it looks like at the point where we are already generating the expression tree, we are no longer aware of the type of object you are working with.
I checked this example as well, but again, it looks like we are injecting strings instead of setting object references.
Ideally I want something like this:
public class AuditInterceptor
{
public void Intercept(object obj)
{
if (!(obj is Invoice) && !(obj is InvoiceItem))
return; //not type we are looking for, by-pass
//Set the audit here
}
}
Below is what I am trying to do. I am using Entity Framework 6 and I have a DataLayer Object that I am passing up the layers to a BusinessData Object. Basically get the object from the database and pass its values to a new object that mirrors it in the BusinessData layer.
See below for code.
Entity Framework Generated Object
public partial class SolutionArea
{
public SolutionArea()
{
this.Awards = new HashSet<Award>();
this.Competencies = new HashSet<Competency>();
this.KeyWins = new HashSet<KeyWin>();
this.Offerings = new HashSet<Offering>();
this.Products = new HashSet<Product>();
this.Programs = new HashSet<Program>();
}
public int ID { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public string Manager { get; set; }
public string PreSalesCount { get; set; }
public virtual ICollection<Award> Awards { get; set; }
public virtual ICollection<Competency> Competencies { get; set; }
public virtual ICollection<KeyWin> KeyWins { get; set; }
public virtual ICollection<Offering> Offerings { get; set; }
public virtual ICollection<Product> Products { get; set; }
public virtual ICollection<Program> Programs { get; set; }
}
Data Layer Object
namespace SolutionsEntities.DataAccessObjects
{
public class SolutionAreaDAO
{
public SolutionAreaBDO GetSolutionArea(int Id)
{
SolutionAreaBDO solutionAreaBDO = null;
using(var context = new SolutionsEntities())
{
SolutionArea solutionAreaDAO = (from s in context.SolutionAreas
where s.ID == Id
select s).FirstOrDefault();
if (solutionAreaDAO != null)
{
solutionAreaBDO = new SolutionAreaBDO();
{
solutionAreaBDO.Title = solutionAreaDAO.Title;
solutionAreaBDO.Programs = solutionAreaDAO.Programs;
}
}
}
}
}
Business Data Object
namespace SolutionsBDO
{
public class SolutionAreaBDO
{
public int ID { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public string Manager { get; set; }
public string PreSalesCount { get; set; }
public virtual ICollection<AwardBDO> Awards { get; set; }
public virtual ICollection<CompetencyBDO> Competencies { get; set; }
public virtual ICollection<KeyWinBDO> KeyWins { get; set; }
public virtual ICollection<OfferingBDO> Offerings { get; set; }
public virtual ICollection<ProductBDO> Products { get; set; }
public virtual ICollection<ProgramBDO> Programs { get; set; }
}
}
The problem I have is in the SolutionAreaDAO class above I get an Error saying I cannot convert an ICollection to an ICollection. This is the line of code that causes the issue:
solutionAreaBDO = new SolutionAreaBDO();
{
solutionAreaBDO.Title = solutionAreaDAO.Title;
solutionAreaBDO.Programs = solutionAreaDAO.Programs;
}
Both objects have a property that is a separate entity. SolutionArea object contains a Collection of Program objects. When I try to set the collection from the Data Object to the Business Object I get an explicit cast error.
Error 1 Cannot implicitly convert type 'System.Collections.Generic.ICollection<SolutionsEntities.Program>' to 'System.Collections.Generic.ICollection<SolutionsBDO.ProgramBDO>'. An explicit conversion exists (are you missing a cast?) C:\Projects\SolutionsBackgrounder\SolutionsEntities\DataAccessObjects\SolutionAreaDAO.cs 26 52 SolutionsEntities
I'm sure I'm just not doing tis right but if someone can point me in the right direction it would be much appreciated!
Thanks,
Joe
You're trying to convert a ICollection<SolutionsEntities.Program>> to an ICollection<SolutionsBDO.ProgramBDO>
Those are two collections with a different type parameter (that are unrelated as far as the compiler is concerned). You need to either convert these objects manually, change the collection type on either you BDO or your DAO or use something like AutoMapper to convert them automatically