asp.net mvc 3 - MVC 3 default edit won't work if I remove a field -


i've created default mvc 3 project , created default edit page model. if don't touch it, work fine.

now wanted remove 1 of edit fields on edit page (because don't want primary key editable). changed editfor displayfor. sown correctly then, if want save following error:

dbupdateconcurrencyexception unhandled user code

store update, insert, or delete statement affected unexpected number of rows (0). entities may have been modified or deleted since entities loaded. refresh objectstatemanager entries.

in edit action can see, model class doesn't primary key anymore (it's 0) , update doesn't work.

// post: /weiterleitung/edit/5         [httppost]         public actionresult edit(rufnummern_weiterleitungen rufnummern_weiterleitungen)         {             if (modelstate.isvalid)             {                 db.entry(rufnummern_weiterleitungen).state = entitystate.modified;                 db.savechanges();                 return redirecttoaction("index");             }             return view(rufnummern_weiterleitungen);         }          protected override void dispose(bool disposing)         {             db.dispose();             base.dispose(disposing);         }

how can avoid error without showing every single field of model edit field?

your post action misses id because displayfor<> doesn't render html control , value therefore not posted controller action. can either pass id action parameter (you need add parameter html.beginform()-call in view , modify edit action accordingly) or can add hiddenfor<>-field contains id. hidden field passed on controller upon postback , should recognized default binding handler creates rufnummern_weiterleitungen instance form values.


Comments

Post a Comment

Popular posts from this blog

java - Play! framework 2.0: How to display multiple image? -

i need display gallery of photos. here template: @(photos: list[photo]) @title = { <bold>gallery</bold> } @main(title,"photo"){ <ul class="thumbnails"> @for(photo <- photos) { <li class="span3"> <a href="#" class="thumbnail"> <img src="@photo.path" alt=""> </a> </li> } </ul> } and here controller method: public static result getphotos() { return ok(views.html.photo.gallery.render(photo.get())); } and here photo bean : @entity public class photo extends model { @id public long id; @required public string label; public string path; public photo(string path, string label) { this.path = path; this.label = label; } private static finder<long, photo> find = new finder<long, photo>( long.class, photo.class); public static list<phot...
Read more

gmail - Is there any documentation for read-only access to the Google Contacts API? -

i want read-only access user's google contacts. there stackoverflow member wanted this, , received following answer : yes, there is, use https://www.googleapis.com/auth/contacts.readonly scope , "view contacts". this exchange reference read-only access google contacts can find using google. simply using access token obtained attempt read usual google contacts api (i.e. https://www.google.com/m8/feeds ) fails insufficient permissions. similarly, using google contacts api on new target fails 404 errors (for example https://www.googleapis.com/auth/contacts.readonly/default/full ). is there documentation anywhere on how use api, or permissible way access google contacts api full read-write access?
Read more

php - Controller/JToolBar not working in Joomla 2.5 -

relevant code: jtoolbarhelper::custom('savecategories', 'save', '', 'save', false, false); ... <input type="hidden" name="controller" value="easyblogcontroller"> according can dig docs , own previous questions, should call savecategories() function in easyblogcontroller . i've tried setting value easyblog , easyblog.php (file name) current easyblogcontroller (class name). clicking on save button refreshes page. not redirect, echo or var_dump test code put in savecategories() function. var_dump ing jrequest::getvar('controller') , 'task' return correct values. creating controller object , using $controller->execute('task'); works. the values going depend on location of controller trying call, , have couple options here. typically there controller in base folder of component (likely components/com_easyblog) in file called controller.php , class name inside ...
Read more