- Update to use PostgreSQL in `XXXMigrationsDbContextFactory`
- Replace the `new DbContextOptionsBuilder<XXXMigrationsDbContext>().UseSqlServer()` with the `new DbContextOptionsBuilder<XXXMigrationsDbContext>().UseNpgsql()`
### Delete Existing Migrations
Delete all existing migration files (including `DbContextModelSnapshot`)
Set the correct startup project (usually a web project),
Open the **Package Manager Console** (Tools -> Nuget Package Manager -> Package Manager Console), select the `Acme.BookStore.EntityFrameworkCore.DbMigrations` as the **Default project** and execute the following command:
Open the **Package Manager Console** (Tools -> Nuget Package Manager -> Package Manager Console), select the `.EntityFrameworkCore.DbMigrations` as the **Default project** and execute the following command:
Run `Add-Migration` command.
````
PM> Add-Migration Initial
````
Then execute the `Update-Database` command to update the database schema:
### Update the Database
You have two options to create the database.
#### Using the DbMigrator Application
The solution contains a console application (named `Acme.BookStore.DbMigrator` in this sample) that can create database, apply migrations and seed initial data. It is useful on development as well as on production environment.
> `.DbMigrator` project has its own `appsettings.json`. So, if you have changed the connection string above, you should also change this one.
Right click to the `.DbMigrator` project and select **Set as StartUp Project**:
Open the **Package Manager Console** (Tools -> Nuget Package Manager -> Package Manager Console), select the `.EntityFrameworkCore.DbMigrations` as the **Default project** and execute the following command:
````
PM> Update-Database
````
This will create a new database based on the configured connection string.