daniel-c-harvey
66 lines
2.7 KiB
C#
66 lines
2.7 KiB
C#
using Microsoft.EntityFrameworkCore.Migrations;
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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 AddReleaseEntryKey : 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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// 11.H — front the int PK with an app-minted GUID-string EntryKey (Phase 11 §3e). The
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// scaffolded single non-null-with-"" add is hand-edited into the three-step backfill the
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// spec requires (§3e.5(2)): existing rows must each get a UNIQUE, non-null key, so a shared
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// "" default would collide on the unique index. Add nullable → backfill a GUID per row →
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// mark non-null. No DB default is set on the final column: new rows are app-populated by
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// FindOrCreateRelease (Guid.NewGuid().ToString()), exactly as tracks mint their EntryKey.
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// 1) Add the column nullable so the backfill can run before the NOT NULL constraint.
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migrationBuilder.AddColumn<string>(
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name: "entry_key",
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table: "release",
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type: "character varying(100)",
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maxLength: 100,
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nullable: true);
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// 2) Backfill a unique GUID string per existing row. gen_random_uuid()::text yields the
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// lowercase 36-char hyphenated shape Guid.NewGuid().ToString() produces, so migrated and
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// app-minted keys are indistinguishable. Per-row evaluation → each row gets a distinct key.
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migrationBuilder.Sql(
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"UPDATE \"release\" SET \"entry_key\" = gen_random_uuid()::text WHERE \"entry_key\" IS NULL;");
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// 3) Now every row is populated and unique — enforce NOT NULL.
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migrationBuilder.AlterColumn<string>(
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name: "entry_key",
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table: "release",
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type: "character varying(100)",
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maxLength: 100,
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nullable: false,
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oldClrType: typeof(string),
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oldType: "character varying(100)",
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oldMaxLength: 100,
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oldNullable: true);
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migrationBuilder.CreateIndex(
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name: "IX_release_entry_key",
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table: "release",
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column: "entry_key",
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unique: true);
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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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migrationBuilder.DropIndex(
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name: "IX_release_entry_key",
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table: "release");
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migrationBuilder.DropColumn(
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name: "entry_key",
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table: "release");
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}
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}
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}
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