feat: normalize release-cardinal fields out of track into a Release entity (Phase 8 §8.0)
This commit is contained in:
daniel-c-harvey
@@ -0,0 +1,184 @@
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using System;
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using Microsoft.EntityFrameworkCore.Migrations;
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using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
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#nullable disable
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namespace DeepDrftData.Migrations
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{
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/// <inheritdoc />
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public partial class NormalizeReleaseTrack : Migration
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{
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/// <inheritdoc />
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protected override void Up(MigrationBuilder migrationBuilder)
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{
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// 1. Create the release table.
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migrationBuilder.CreateTable(
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name: "release",
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columns: table => new
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{
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id = table.Column<long>(type: "bigint", nullable: false)
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.Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
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title = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
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artist = table.Column<string>(type: "character varying(200)", maxLength: 200, nullable: false),
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genre = table.Column<string>(type: "character varying(100)", maxLength: 100, nullable: true),
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release_date = table.Column<DateOnly>(type: "date", nullable: true),
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image_path = table.Column<string>(type: "character varying(500)", maxLength: 500, nullable: true),
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release_type = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false, defaultValue: "Single"),
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created_by_user_id = table.Column<long>(type: "bigint", nullable: true),
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created_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
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updated_at = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
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is_deleted = table.Column<bool>(type: "boolean", nullable: false, defaultValue: false)
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},
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constraints: table =>
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{
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table.PrimaryKey("PK_release", x => x.id);
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});
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migrationBuilder.CreateIndex(
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name: "IX_release_is_deleted",
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table: "release",
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column: "is_deleted");
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// 2. Add the nullable FK column to track. A fresh column (not a rename of
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// created_by_user_id) so existing rows start with a null release until back-filled.
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migrationBuilder.AddColumn<long>(
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name: "release_id",
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table: "track",
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type: "bigint",
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nullable: true);
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// 3. Data migration — must run after the release table exists and release_id is added,
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// and before the release-cardinal columns are dropped from track (the SELECT reads them).
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// Create one release row per distinct (album, artist) from existing tracks, carrying
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// the release-cardinal fields. Tracks with a null album remain release_id = null.
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migrationBuilder.Sql(@"
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INSERT INTO release (title, artist, genre, release_date, image_path, release_type,
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created_by_user_id, created_at, updated_at, is_deleted)
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SELECT DISTINCT ON (album, artist)
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album, artist, genre, release_date, image_path, release_type,
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created_by_user_id, NOW(), NOW(), false
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FROM track
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WHERE album IS NOT NULL
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ORDER BY album, artist, id;
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");
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// Back-fill the FK: match each track to the release created from its (album, artist).
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migrationBuilder.Sql(@"
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UPDATE track
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SET release_id = r.id
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FROM release r
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WHERE track.album = r.title
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AND track.artist = r.artist;
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");
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// 4. Index + FK now that the column carries its back-filled values.
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migrationBuilder.CreateIndex(
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name: "IX_track_release_id",
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table: "track",
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column: "release_id");
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migrationBuilder.AddForeignKey(
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name: "FK_track_release_release_id",
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table: "track",
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column: "release_id",
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principalTable: "release",
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principalColumn: "id",
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onDelete: ReferentialAction.SetNull);
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// 5. Drop the now-migrated release-cardinal columns from track.
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migrationBuilder.DropColumn(name: "album", table: "track");
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migrationBuilder.DropColumn(name: "artist", table: "track");
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migrationBuilder.DropColumn(name: "genre", table: "track");
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migrationBuilder.DropColumn(name: "image_path", table: "track");
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migrationBuilder.DropColumn(name: "release_date", table: "track");
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migrationBuilder.DropColumn(name: "release_type", table: "track");
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migrationBuilder.DropColumn(name: "created_by_user_id", table: "track");
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}
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/// <inheritdoc />
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protected override void Down(MigrationBuilder migrationBuilder)
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{
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// 1. Re-add the track release-cardinal columns. artist is non-nullable with a default so
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// the add succeeds against existing rows before the back-fill repopulates it.
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migrationBuilder.AddColumn<string>(
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name: "album",
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table: "track",
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type: "character varying(200)",
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maxLength: 200,
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nullable: true);
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migrationBuilder.AddColumn<string>(
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name: "artist",
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table: "track",
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type: "character varying(200)",
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maxLength: 200,
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nullable: false,
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defaultValue: "");
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migrationBuilder.AddColumn<string>(
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name: "genre",
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table: "track",
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type: "character varying(100)",
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maxLength: 100,
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nullable: true);
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migrationBuilder.AddColumn<string>(
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name: "image_path",
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table: "track",
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type: "character varying(500)",
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maxLength: 500,
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nullable: true);
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migrationBuilder.AddColumn<DateOnly>(
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name: "release_date",
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table: "track",
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type: "date",
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nullable: true);
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migrationBuilder.AddColumn<string>(
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name: "release_type",
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table: "track",
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type: "character varying(20)",
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maxLength: 20,
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nullable: false,
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defaultValue: "Single");
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migrationBuilder.AddColumn<long>(
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name: "created_by_user_id",
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table: "track",
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type: "bigint",
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nullable: true);
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// 2. Re-populate the track columns from the release join before the release table and FK go.
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migrationBuilder.Sql(@"
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UPDATE track
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SET artist = r.artist,
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album = r.title,
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genre = r.genre,
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release_date = r.release_date,
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image_path = r.image_path,
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release_type = r.release_type,
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created_by_user_id = r.created_by_user_id
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FROM release r
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WHERE track.release_id = r.id;
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");
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// 3. Drop the FK, index, the release_id column, and the release table.
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migrationBuilder.DropForeignKey(
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name: "FK_track_release_release_id",
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table: "track");
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migrationBuilder.DropIndex(
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name: "IX_track_release_id",
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table: "track");
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migrationBuilder.DropColumn(
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name: "release_id",
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table: "track");
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migrationBuilder.DropTable(
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name: "release");
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}
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}
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}
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