Access foreign key not updating

12-Aug-2015 19:21 by 7 Comments

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To facilitate this, the scaffolded code includes controller methods and Create and Edit views that include a drop-down list for selecting the department. Save Changes(); return Redirect To Action("Index"); } catch (Retry Limit Exceeded Exception /* dex */) { //Log the error (uncomment dex variable name and add a line here to write a log. The drop-down list sets the } catch (Retry Limit Exceeded Exception /* dex */) { //Log the error (uncomment dex variable name and add a line here to write a log.) Model State. Try again, and if the problem persists, see your system administrator."); } Populate Departments Drop Down List(course. Find(id); if (Try Update Model(course To Update, "", new string[] { "Title", "Credits", "Department ID" })) { try { db. Try again, and if the problem persists, see your system administrator."); } } Populate Departments Drop Down List(course To Update. Department ID = new Select List(departments Query, "Department ID", "Name", selected Department); } public Action Result Edit(int? Find(id); if (course == null) { return Http Not Found(); } Populate Departments Drop Down List( catch (Retry Limit Exceeded Exception /* dex */) { //Log the error (uncomment dex variable name and add a line here to write a log.) Model State. Try again, and if the problem persists, see your system administrator."); } This code ensures that when the page is redisplayed to show the error message, whatever department was selected stays selected.

id) { if (id == null) { return new Http Status Code Result(Http Status Code. Normally the scaffolder doesn't scaffold a primary key because the key value is generated by the database and can't be changed and isn't a meaningful value to be displayed to users. Now you'll enhance the Instructor Edit page by adding the ability to change course assignments using a group of check boxes, as shown in the following screen shot: The relationship between the navigation property. Single(); if (Try Update Model(instructor To Update, "", new string[] { "Last Name", "First Mid Name", "Hire Date", "Office Assignment" })) { try { if (String. The Contoso University sample web application demonstrates how to create ASP. The check boxes all have the same name ("selected Courses"), which informs the model binder that they are to be treated as a group. NET MVC 5 applications using the Entity Framework 6 Code First and Visual Studio 2013. For information about the tutorial series, see the first tutorial in the series. In the previous tutorial you displayed related data; in this tutorial you'll update related data. For Course entities the scaffolder does include an text box for the attribute means the user should be able enter the primary key value. Try again, and if the problem persists, see your system administrator."); } } return View(instructor To Update); } Run the page (select the Instructors tab and then click Edit on an instructor). The UI that enables you to change which courses an instructor is assigned to is a group of check boxes.

But it doesn't understand that because the number is meaningful you want to see it in the other views, so you need to add it manually. Save Changes(); return Redirect To Action("Index"); } catch (Retry Limit Exceeded Exception /* dex */) { //Log the error (uncomment dex variable name and add a line here to write a log. A check box for every course in the database is displayed, and the ones that the instructor is currently assigned to are selected. In Run the Create page (display the Course Index page and click Create New) and enter data for a new course: Click Create. The user can select or clear check boxes to change course assignments. For most relationships, this can be done by updating either foreign key fields or navigation properties. For many-to-many relationships, the Entity Framework doesn't expose the join table directly, so you add and remove entities to and from the appropriate navigation properties. The following illustrations show some of the pages that you'll work with. When a new course entity is created, it must have a relationship to an existing department. Try again, and if the problem persists, see your system administrator."); } } c.