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Data Migrations (OrchardCore.Data.Migration.DataMigration)

Configuring Data Migration

Data Migration classes can be used to alter the content type definitions (like by adding new types, or configuring their parts and fields), initializing recipes or creating indices.

To implement a migration, your class should inherit from the DataMigration class. The initial migration method must be named public int Create() or public Task<int> CreateAsync(), and it should return a number (e.g., 1). Subsequent migrations should adhere to the convention public int UpdateFromX() or public Task<int> UpdateFromXAsync(), where X represents the number returned by the last migration method. The migration process strictly follows this chain: for instance, UpdateFrom4() will only execute if the last migration returned the number 4. It is crucial not to modify these numbers afterward, as doing so may disrupt migrations for other tenants.

Migrations are executed automatically on application start.

The following example showcases three different data migrations (recipe migration, creating a map index, creating content type and updating content type).

using System.Threading.Tasks;
using Members.Indexes;
using OrchardCore.ContentManagement.Metadata;
using OrchardCore.ContentManagement.Metadata.Settings;
using OrchardCore.Data.Migration;
using OrchardCore.Recipes.Services;
using YesSql.Sql;

namespace Members
    public class Migrations : DataMigration
        private readonly IRecipeMigrator _recipeMigrator;
        private readonly IContentDefinitionManager _contentDefinitionManager;

        public Migrations(IRecipeMigrator recipeMigrator, IContentDefinitionManager contentDefinitionManager)
            _recipeMigrator = recipeMigrator;
            _contentDefinitionManager = contentDefinitionManager;

        public async Task<int> CreateAsync()
            await _recipeMigrator.ExecuteAsync("init.recipe.json", this);

            return 1;

        public async Task<int> UpdateFrom1Async()
            await SchemaBuilder.CreateMapIndexTableAsync<MemberIndex>(table =>
                // Make sure to set column length, otherwise migration will not work for all databases
                table.Column<string>(nameof(MemberIndex.SocialSecurityNumber), column => column.WithLength(11))
                .Column<string>(nameof(MemberIndex.Name), column => column.WithLength(26))
                .Column<string>(nameof(MemberIndex.Surname), column => column.WithLength(26))

            // This will create index on the sql table itself, 
            // which will make fetches by 'SocialSecurityNumber' column faster
            await SchemaBuilder.AlterIndexTableAsync<MemberIndex>(table => table
            return 2;

        public int UpdateFrom2()
            _contentDefinitionManager.AlterTypeDefinition("Product", type => type
                // Content items of this type can have drafts
                // Content items versions of this type are versionable
                // This content type appears in the New menu section
                // Permissions can be applied specifically to instances of this type
            return 3;

        public int UpdateFrom3()
            _contentDefinitionManager.AlterTypeDefinition("Product", type => type
            return 4;


Additional information

Please refer to separate sections for more details on data migrations: