I am working ASP.NET MVC using Entity frame work code first approach. I am facing an issue ,the issue is as i have dropped two tables by using Package Manager Console.
Now i am trying to add the tables, the tables are not getting added using Package Manager Console.
Getting Error Cannot find the object "dbo.Movies" because it does not exist or you do not have permissions.
Even in Indentity.cs Model [Movies] is mentioned.
public DbSet Movies { get; set; }
Below are the Model.
public class Movie
{
public int Id { get; set; }
public string Name { get; set; }
public DateTime ReleaseDate { get; set; }
public Genre Genres { get; set; }
public byte GenreId { get; set; }
public DateTime DateAdded { get; set; }
public int NumberOfStocks { get; set; }
}
public class Genre
{
public byte Id { get; set; }
public string Type { get; set; }
}
How to the add the new table in existing Entity frame work using Code first approach.
Related
I have a simple ASPNET core Razor WEB App.
In this I have a the following Model classes
public class Student
{
public int ID { get; set; }
public string RegID { get; set; }
public string Name { get; set; }
public int? SectionID { get; set; }
public Section Section { get; set; }
}
public class Section
{
public int ID { get; set; }
public string Name { get; set; }
}
What I want to Create is a razor page where I can select a Section, and Select multiple students and Submit to Update All the selected students with the new selected sections.
Any kind of Help will be appreciated, Even ones with MVC solution.
Regards
I’m coming from an intermediate C++ background (and to a lesser extent, C#) and wanted to try to build a project in Asp.net MVC 6 with EF 7 – not realizing how completely different it is from simple C# forms. I’ve stumbled through and researched a lot but since I’m a total noob I’m stumped at this point.
I have the following models:
public class Shift
{
public int ShiftId { get; set; }
//other properties
public virtual ICollection<ShiftActivity> ShiftActivity { get; set;}
}
public class ShiftActivity
{
public int ShiftActivityID { get; set; }
public DateTime StartTime { get; set; }
public int ShiftID { get; set; }
public int ActivityID { get; set; }
public int LocationID { get; set; }
public virtual Shift Shift { get; set; }
public virtual Activity Activity { get; set; }
public virtual Location Location { get; set; }
}
public class Activity
{
public int ActivityID { get; set; }
public string ActivityName { get; set; }
public virtual ICollection<ShiftActivity> ShiftActivity { get; set; }
}
public class Location
{
public int LocationID { get; set; }
public string LocationName { get; set; }
public string LocationAddress { get; set; }
public int locationZip { get; set; }
public virtual ICollection<ShiftActivity> ShiftActivity { get; set; }
}
I would like to create a shift and be able to input all the required fields all from one view. For instance, when I create the shift, I need to pick the type of location and activity to add to the ShiftActivity table which is then updated. Eventually I would like to be able to dynamically add additional activities (I’m assuming I’ll need javascript for that), but that’s another issue. I know I need a viewmodel to access all the tables, but I’m unclear as to how the viewmodel should be structured correctly.
Also, can the ShiftController update the ShiftActivity table directly or do I need to transfer the data somehow to the ShiftAcitivityController when the form is submitted? Either way, can someone point me to an example? Thank you… Any help is greatly appreciated.
I have a class Ticket which has some properties. Three of these (View, Task and Key) properties are navigation properties. Those properties already exist in database even before a ticket has been stored. In my application I load those properties from the database first and then create a Ticket object. I need to save only the ticket (not the underlying objects ) to the database with the id to Key, View and Task (these are primery keys in the Ticket table)
[Table("Tickets")]
public class Ticket
{
[Key]
public int Id { get; set; }
public DateTime? Created { get; set; }
[Required]
public View View{ get; set; }
[Required]
public Key Key { get; set; }
public Task Task { get; set; }
}
I try to save the Ticket object like this:
db.Tickets.Add(ticket);
db.Entry(ticket.Key).State = System.Data.Entity.EntityState.Unchanged;
db.Entry(ticket.View).State = System.Data.Entity.EntityState.Unchanged;
db.Entry(ticket.Task).State = System.Data.Entity.EntityState.Unchanged;
db.SaveChanges();
When I try this approach I get the error:
{"Message":"An error has occurred.","ExceptionMessage":"Saving or accepting changes failed because more than one entity of type 'Key' have the same primary key value. Ensure that explicitly set primary key values are unique. Ensure that database-generated primary keys are configured correctly in the database and in the Entity Framework model. Use the Entity Designer for Database First/Model First configuration. Use the 'HasDatabaseGeneratedOption\" fluent API or 'DatabaseGeneratedAttribute' for Code First configuration.","
Is it even possible to work with Entity Framework this way? Having pre defined data which is loaded to it's objects (Key, View, Task) first and later assign these objects to an object having these properties but then in the entity framework context only adding the parent object, in this case the ticket?
I have also tried to set the underlying objects to null but then I will loose the data for those underlying objects, data I need later on in the application.
This is how the underlying objects look like:
[Table("Views")]
public class View
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
[Required]
public string Name { get; set; }
[Required]
public string Version { get; set; }
[Required]
public DateTime? Created { get; set; }
}
[Table("Keys")]
public class Key
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
[Required]
public string Name { get; set; }
[Required]
public string Version { get; set; }
[Required]
public DateTime? Created { get; set; }
}
[Table("Tasks")]
public class Task
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
[Required]
public string Name { get; set; }
[Required]
public string Version { get; set; }
[Required]
public DateTime? Created { get; set; }
}
Try adding Foreign Keys to your object and making those required instead of making the navigation property required. Like so:
[Table("Tickets")]
public class Ticket
{
[Key]
public int Id { get; set; }
public DateTime? Created { get; set; }
[Required]
public int ViewId {get; set; }
[ForeignKey("ViewId")]
public View View{ get; set; }
[Required]
public int KeyId {get; set; }
[ForeignKey("KeyId")]
public Key Key { get; set; }
public Task Task { get; set; }
}
A collegue of mine accidentally deleted the UserProfiles table from my database, which was generated from a model class.
Here's what the model class looks like:
namespace OneMillion.Models
{
[Table("UserProfile")]
public class User
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int UserId { get; set; }
public string UserName { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public int Age { get; set; }
public string Sex { get; set; }
public string SecretQuestion { get; set; }
public string SecretQuestionAnswer { get; set; }
public int MoneyIn { get; set; }
public int MoneyOut { get; set; }
public int TimesWon { get; set; }
}
}
When I try to Update-Database via the package manager console I get this error:
Cannot find the object "dbo.UserProfile" because it does not exist or you do not have permissions.
Data migrations are enabled.
How can I solve this? Shall I delete the whole database?
Can you connect to the DB as a user with sufficient permissions to create databases? You could log in as that user in SSMS and create the table with the appropriate columns etc. Then the table exists, and migrations can find it.
First of all ASP.NET and MVC 4 are very new to me (+- one month) and sorry if its a bad question.
I've got two classes "Turma" and "Curso"
public class Turma
{
[Key]
public int idCurso { get; set; }
public string RefTurma { get; set; }
public Curso Curso { get; set; }
public string NomeCurso { get; set; }
}
and
public class Curso
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
public int idArtigoAT { get; set; }
public string ConteudoPrograma { get; set; }
public virtual ICollection<Turma> Turmas { get; set; }
}
After this I started a migration and updated the database. So far so good, but then problems.
Due to new information the primary key type should be varchar(18). I've tried to change but so far without success.
Any ideia or solution???
No, what you want is an 'Id' property and an 'MyCustomUniqueName' property. this custom property, should be and unique index in database. this is the best design for this situation IMHO.