Error while creating plugin in Nop Commerce - asp.net-mvc

Question

This is my first demo project in Nopcommerce and i have tried to make my own plugin but during the time of Build some error is seen. Below are some codes.
namespace Nop.Plugin.Aowi.Testimonial.Data
{
public class TestimonialRecordObjectContext : DbContext , IDbContext
{
public TestimonialRecordObjectContext(string nameOrConnectionString) : base(nameOrConnectionString) { }
#region Implementation of IDbContext
#endregion
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Configurations.Add(new TestimonialRecordMap());
base.OnModelCreating(modelBuilder);
}
public string CreateDatabaseInstallationScript()
{
return ((IObjectContextAdapter)this).ObjectContext.CreateDatabaseScript();
}
public void Install()
{
//It's required to set initializer to null (for SQL Server Compact).
//otherwise, you'll get something like "The model backing the 'your context name' context has changed since the database was created. Consider using Code First Migrations to update the database"
Database.SetInitializer<TestimonialRecordObjectContext>(null);
Database.ExecuteSqlCommand(CreateDatabaseInstallationScript());
SaveChanges();
}
public void Uninstall()
{
var dbScript = "DROP TABLE Testimonial";
Database.ExecuteSqlCommand(dbScript);
SaveChanges();
}
public new IDbSet<TEntity> Set<TEntity>() where TEntity : BaseEntity
{
return base.Set<TEntity>();
}
public System.Collections.Generic.IList<TEntity> ExecuteStoredProcedureList<TEntity>(string commandText, params object[] parameters) where TEntity : BaseEntity, new()
{
throw new System.NotImplementedException();
}
public System.Collections.Generic.IEnumerable<TElement> SqlQuery<TElement>(string sql, params object[] parameters)
{
throw new System.NotImplementedException();
}
public int ExecuteSqlCommand(string sql, bool doNotEnsureTransaction = false, int? timeout = null, params object[] parameters)
{
throw new System.NotImplementedException();
}
}
}
This is the Dependency registrar part
namespace Nop.Plugin.Aowi.Testimonial.Infastructure
{
public class DependencyRegistrar: IDependencyRegistrar
{
private const string CONTEXT_NAME ="nop_object_context_product_view_tracker";
public virtual void Register(ContainerBuilder builder, ITypeFinder typeFinder, NopConfig config)
{
//data context
this.RegisterPluginDataContext<TestimonialRecordObjectContext>(builder, CONTEXT_NAME);
//override required repository with our custom context
builder.RegisterType<EfRepository<TestimonialRecord>>()
.As<IRepository<TestimonialRecord>>()
.WithParameter(ResolvedParameter.ForNamed<IDbContext>(CONTEXT_NAME))
.InstancePerLifetimeScope();
}
public int Order
{
get { return 1; }
}
}
}
Even after cleaning and Building i am getting this error.
Can anyone help me with this. I have done all of this by watching a tutorial so if anyone can help me correct my mistake i will be really greatful.

Answer 1

You just need to implement this method and properties of IDbContext interface, which are described in error log, in your custom context.
for example, how it is done in one of the existing plugin Tax.CountryStateZip:
public void Detach(object entity)
{
if (entity == null)
throw new ArgumentNullException("entity");
((IObjectContextAdapter)this).ObjectContext.Detach(entity);
}
public virtual bool ProxyCreationEnabled
{
get { return this.Configuration.ProxyCreationEnabled; }
set { this.Configuration.ProxyCreationEnabled = value; }
}
public virtual bool AutoDetectChangesEnabled
{
get { return this.Configuration.AutoDetectChangesEnabled; }
set { this.Configuration.AutoDetectChangesEnabled = value; }
}

Answer 2

I cannot get an idea from your code that where is actual issue. But i suggest by an example.
make your install method code like:
public void Install()
{
//create the table
var dbScript = CreateDatabaseScript();
Database.ExecuteSqlCommand(dbScript);
SaveChanges();
}
Add a new class called EfStartUpTask and paste following code:
public class EfStartUpTask : IStartupTask
{
public void Execute()
{
//It's required to set initializer to null (for SQL Server Compact).
//otherwise, you'll get something like "The model backing the 'your context name' context has changed since the database was created. Consider using Code First Migrations to update the database"
Database.SetInitializer<YourContext>(null);
}
public int Order
{
//ensure that this task is run first
get { return 0; }
}
}
And your DependencyRegistrar :
public class DependencyRegistrar : IDependencyRegistrar
{
public virtual void Register(ContainerBuilder builder, ITypeFinder typeFinder)
{
builder.RegisterType<YourService>().As<YourserviceInterface>().InstancePerLifetimeScope();
//data context
this.RegisterPluginDataContext<YourContext>(builder, "nop_object_context_product_view_tracker");
//override required repository with our custom context
builder.RegisterType<EfRepository<YourEntityClass>>()
.As<IRepository<YourEntityClass>>()
.WithParameter(ResolvedParameter.ForNamed<IDbContext>("nop_object_context_product_view_tracker"))
.InstancePerLifetimeScope();
}
public int Order
{
get { return 1; }
}
}
Note: you have to change YourContext to your context name and same as for entity class
Hope this helps!