Plugin development Error : The model backing the 'PluginObjectContext' context has changed since the database was created

I am trying to create a new plugin for Moneris Payment but I have problems with the database.
When trying to install my plugin I have this error : The model backing the 'PluginObjectContext' context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269).

If I add the code : Database.SetInitializer<PluginObjectContext>(null); before Database.ExecuteSqlCommand(CreateDatabaseInstallationScript()); it solves this error but the same error appears while trying to insert new data in the table.

Does someone have an idea of the solution ?

Thanks.

rfabre wrote:

If you are like many of us, the issue is caused by SQL CE. I usually just switch to SQL Server on my development installation, since nobody is going to use SQL CE on production anyway.

No I am already using SQL Server.

Thanks for the suggestion.

rfabre wrote:

If that's the case, have you make sure that there's no mismatch between your model and the database table? This error also happens when your code cannot map to your database. :)

I have checked again and can't see any difference between the table and my model

I solved the problem by adding a class EfStartUpTask in the Data folder.
This is the code :

using System.Data.Entity;
using Nop.Core.Infrastructure;

namespace Nop.Plugin.Payments.MyPlugin.Data
{
    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<MonerisTransactionObjectContext>(null);
        }

        public int Order
        {
            //ensure that this task is run first 
            get { return 0; }
        }
    }
}

@rfabre

Thanks for your solution !!! It works perfect !

It also can be caused by a missing property or key mapping in your plugin's EntityMap class or classes

@rfabre

Thank you very much.

The class  "EfStartUpTask : IStartupTask" worked for me, after trying a hundred things dealing with my model class and model mapping :( :(

I think this should be documented somewhere in https://www.nopcommerce.com/docs/75/plugin-with-data-access.aspx

Best regards

This works perfectly - I'm glad this fixes the issue as this is the second time it's happened to me, previously I reinstalled everything.