Code 1st approach succeeded

Thx to Wes Doyle's Youtube video: https://youtu.be/md20lQut9EE

References:

1. https://docs.microsoft.com/fr-fr/aspnet/core/tutorials/first-mvc-app/adding-model
2. http://www.npgsql.org/efcore/index.html
3. https://stackoverflow.com/q/59790994/3184351
4. https://docs.microsoft.com/fr-fr/ef/core/get-started/overview/first-app?tabs=netcore-cli#create-the-database

Data/MvcMovieContext.cs

+using Microsoft.EntityFrameworkCore;
+using SampleMVCApps.Models;
+
+namespace SampleMVCApps.Data
+{
+    public class MvcMovieContext : DbContext
+    {
+        public MvcMovieContext(DbContextOptions<MvcMovieContext> options)
+            : base(options)
+        {
+        }
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+            => optionsBuilder
+                .UseNpgsql("Host=localhost;Port=5432;Database=MvcMovie;Username=mydev;Password=my0eV;Integrated Security=true;Pooling=true")
+                .UseSnakeCaseNamingConvention();
+        public DbSet<Movie> Movies { get; set; }
+    }
+}
\ No newline at end of file

Migrations/20210301154951_InitialMigration.Designer.cs

+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using SampleMVCApps.Data;
+
+namespace SampleMVCApps.Migrations
+{
+    [DbContext(typeof(MvcMovieContext))]
+    [Migration("20210301154951_InitialMigration")]
+    partial class InitialMigration
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("Relational:MaxIdentifierLength", 63)
+                .HasAnnotation("ProductVersion", "5.0.3")
+                .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+            modelBuilder.Entity("SampleMVCApps.Models.Movie", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasColumnName("id")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("Genre")
+                        .HasColumnType("text")
+                        .HasColumnName("genre");
+
+                    b.Property<decimal>("Price")
+                        .HasColumnType("numeric")
+                        .HasColumnName("price");
+
+                    b.Property<DateTime>("ReleaseDate")
+                        .HasColumnType("timestamp without time zone")
+                        .HasColumnName("release_date");
+
+                    b.Property<string>("Title")
+                        .HasColumnType("text")
+                        .HasColumnName("title");
+
+                    b.HasKey("Id")
+                        .HasName("pk_movies");
+
+                    b.ToTable("movies");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Migrations/20210301154951_InitialMigration.cs

+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+namespace SampleMVCApps.Migrations
+{
+    public partial class InitialMigration : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "movies",
+                columns: table => new
+                {
+                    id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    title = table.Column<string>(type: "text", nullable: true),
+                    release_date = table.Column<DateTime>(type: "timestamp without time zone", nullable: false),
+                    genre = table.Column<string>(type: "text", nullable: true),
+                    price = table.Column<decimal>(type: "numeric", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_movies", x => x.id);
+                });
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "movies");
+        }
+    }
+}

Migrations/MvcMovieContextModelSnapshot.cs

+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using SampleMVCApps.Data;
+
+namespace SampleMVCApps.Migrations
+{
+    [DbContext(typeof(MvcMovieContext))]
+    partial class MvcMovieContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("Relational:MaxIdentifierLength", 63)
+                .HasAnnotation("ProductVersion", "5.0.3")
+                .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+            modelBuilder.Entity("SampleMVCApps.Models.Movie", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasColumnName("id")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("Genre")
+                        .HasColumnType("text")
+                        .HasColumnName("genre");
+
+                    b.Property<decimal>("Price")
+                        .HasColumnType("numeric")
+                        .HasColumnName("price");
+
+                    b.Property<DateTime>("ReleaseDate")
+                        .HasColumnType("timestamp without time zone")
+                        .HasColumnName("release_date");
+
+                    b.Property<string>("Title")
+                        .HasColumnType("text")
+                        .HasColumnName("title");
+
+                    b.HasKey("Id")
+                        .HasName("pk_movies");
+
+                    b.ToTable("movies");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Models/Movie.cs

+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace SampleMVCApps.Models
+{
+    public class Movie
+    {
+        public int Id { get; set; }
+        public string Title { get; set; }
+
+        [DataType(DataType.Date)]
+        public DateTime ReleaseDate { get; set; }
+        public string Genre { get; set; }
+        public decimal Price { get; set; }
+    }
+}
\ No newline at end of file

SampleMVCApps.csproj

@@ -6,6 +6,16 @@
 
   <ItemGroup>
     <PackageReference Include="Dapper" Version="2.0.78" />
+    <PackageReference Include="EFCore.NamingConventions" Version="5.0.2" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="5.0.3">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="5.0.3">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.3" />
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="5.0.2" />
   </ItemGroup>
 

Startup.cs

@@ -8,6 +8,8 @@ using Microsoft.AspNetCore.HttpsPolicy;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
+using Microsoft.EntityFrameworkCore;
+using SampleMVCApps.Data;
 
 namespace SampleMVCApps
 {
@@ -24,6 +26,9 @@ namespace SampleMVCApps
         public void ConfigureServices(IServiceCollection services)
         {
             services.AddControllersWithViews();
+
+            services.AddDbContext<MvcMovieContext>(options =>
+                options.UseNpgsql(Configuration.GetConnectionString("MvcMovieContext")));
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.

appsettings.json

@@ -6,5 +6,8 @@
       "Microsoft.Hosting.Lifetime": "Information"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "ConnectionStrings": {
+    "MvcMovieContext": "Host=localhost;Port=5432;Database=MvcMovie;Username=mydev;Password=my0eV;Integrated Security=true;Pooling=true"
+  }
 }