EntityFrameworkCore.Scaffolding.Handlebars 2.1.1

Allows customization of classes reverse engineered from an existing database using the Entity Framework Core toolchain with Handlebars templates.

There is a newer prerelease version of this package available.
See the version list below for details.
Install-Package EntityFrameworkCore.Scaffolding.Handlebars -Version 2.1.1
dotnet add package EntityFrameworkCore.Scaffolding.Handlebars --version 2.1.1
<PackageReference Include="EntityFrameworkCore.Scaffolding.Handlebars" Version="2.1.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add EntityFrameworkCore.Scaffolding.Handlebars --version 2.1.1
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Entity Framework Core Scaffolding with Handlebars

Scaffold EF Core models using Handlebars templates.

Prerequisites

Database Setup

  1. Use SQL Server Management Studio to connect to SQL Server
    • The easiest is to use LocalDb, which is installed with Visual Studio.
      Connect to: (localdb)\MsSqlLocalDb.
    • Create a new database named NorthwindSlim.
    • Download the data file from <http://bit.ly/northwindslim>.
    • Unzip NorthwindSlim.sql and run the script to create tables and populate them with data.

Usage

  1. Create a new .NET Core class library.

    • If necessary, edit the csproj file to update the TargetFramework to 2.2.

    > Note: Using the EF Core toolchain with a .NET Standard class library is currently not supported. Instead, you can add a .NET Standard class library to the same solution as the .NET Core library, then add existing items and select Add As Link to include entity classes.

  2. Add EF Core SQL Server and Tools NuGet packages.

    • Open the Package Manager Console, select the default project and enter:
      • Install-Package Microsoft.EntityFrameworkCore.SqlServer
      • Install-Package Microsoft.EntityFrameworkCore.Design
  3. Add the EntityFrameworkCore.Scaffolding.Handlebars NuGet package:

    • Install-Package EntityFrameworkCore.Scaffolding.Handlebars
  4. Remove Class1.cs and add a ScaffoldingDesignTimeServices class.

    • Implement IDesignTimeServices by adding a ConfigureDesignTimeServices method
      that calls services.AddHandlebarsScaffolding.
    • You can optionally pass a ReverseEngineerOptions enum to indicate if you wish
      to generate only entity types, only a DbContext class, or both (which is the default).
    public class ScaffoldingDesignTimeServices : IDesignTimeServices
    {
        public void ConfigureDesignTimeServices(IServiceCollection services)
        {
            var options = ReverseEngineerOptions.DbContextAndEntities;
            services.AddHandlebarsScaffolding(options);
        }
    }
    
  5. Open a command prompt at the project level and use the EF .NET Core CLI tools to reverse engineer a context and models from an existing database.

    • Get help on dotnet-ef-dbcontext-scaffold at the command line: dotnet ef dbcontext scaffold -h
    • Execute the following command to reverse engineer classes from the NorthwindSlim database:
    dotnet ef dbcontext scaffold "Data Source=(localdb)\MSSQLLocalDB; Initial Catalog=NorthwindSlim; Integrated Security=True" Microsoft.EntityFrameworkCore.SqlServer -o Models -c NorthwindSlimContext -f --context-dir Contexts
    
    • You should see context and/or entity classes appear in the Models folder of the project.
    • You will also see a CodeTemplates folder appear containing Handlebars templates for customizing generation of context and entity type classes.
    • Add -d to the command to use data annotations. You will need to add the System.ComponentModel.Annotations package to a .NET Standard library containing linked entity classes.
  6. You may edit any of the template files which appear under the CodeTemplates folder.

    • For now you can just add some comments, but you may wish to customize the templates in other ways, for example, by inheriting entities from a base class or implementing
      specific interfaces.
    • When you run the dotnet-ef-dbcontext-scaffold command again, you will see your updated reflected in the generated classes.

Handlebars Helpers and Transformers

You can register Handlebars helpers in the ScaffoldingDesignTimeServices where setup takes place.

  • Create a named tuple as shown with myHelper below.
  • The context parameter of the helper method provides model data injected by the Handlebars scaffolding extension.
  • Pass the tuple to the AddHandlebarsHelpers extension method.
  • To use Handlebars helper defined above, add the following to any of the .hbs files within the CodeTemplates folder: {{my-helper}}
  • You may register as many helpers as you wish.

You can pass transform functions to AddHandlebarsTransformers in order to customize generation of entity type definitions, including class names, constructors and properties.

public class ScaffoldingDesignTimeServices : IDesignTimeServices
{
    public void ConfigureDesignTimeServices(IServiceCollection services)
    {
        // Generate both context and entities
        var options = ReverseEngineerOptions.DbContextAndEntities;

        // Register Handlebars helper
        var myHelper = (helperName: "my-helper", helperFunction: (Action<TextWriter, Dictionary<string, object>, object[]>) MyHbsHelper);

        // Add Handlebars scaffolding templates
        services.AddHandlebarsScaffolding(options);

        // Add optional Handlebars helpers
        services.AddHandlebarsHelpers(myHelper);

        // Add Handlebars transformer for Country property
        services.AddHandlebarsTransformers(
            propertyTransformer: e =>
                e.PropertyName == "Country"
                    ? new EntityPropertyInfo("Country", e.PropertyName)
                    : new EntityPropertyInfo(e.PropertyType, e.PropertyName));

        // Add optional Handlebars transformers
        //services.AddHandlebarsTransformers(
        //    entityNameTransformer: n => n + "Foo",
        //    entityFileNameTransformer: n => n + "Foo",
        //    constructorTransformer: e => new EntityPropertyInfo(e.PropertyType + "Foo", e.PropertyName + "Foo"),
        //    propertyTransformer: e => new EntityPropertyInfo(e.PropertyType, e.PropertyName + "Foo"),
        //    navPropertyTransformer: e => new EntityPropertyInfo(e.PropertyType + "Foo", e.PropertyName + "Foo"));
    }

    // Sample Handlebars helper
    void MyHbsHelper(TextWriter writer, Dictionary<string, object> context, object[] parameters)
    {
        writer.Write("// My Handlebars Helper");
    }
}

Generating TypeScript Entities

To generate TypeScript entities simply pass LanguageOptions.TypeScript to AddHandlebarsScaffolding. Since generating a DbContext class is strictly a server-side concern, you should also pass ReverseEngineerOptions.EntitiesOnly to AddHandlebarsScaffolding.

public class ScaffoldingDesignTimeServices : IDesignTimeServices
{
    public void ConfigureDesignTimeServices(IServiceCollection services)
    {
        // Generate both context and entities
        var options = ReverseEngineerOptions.EntitiesOnly;

        // Generate TypeScript files
        var language = LanguageOptions.TypeScript;

        // Add Handlebars scaffolding templates
        services.AddHandlebarsScaffolding(options, language);
    }
}
  • You can also omit c and --context-dir arguments from the EF Core scaffolding command.
dotnet ef dbcontext scaffold "Data Source=(localdb)\MSSQLLocalDB; Initial Catalog=NorthwindSlim; Integrated Security=True" Microsoft.EntityFrameworkCore.SqlServer -o Models -f

Entity Framework Core Scaffolding with Handlebars

Scaffold EF Core models using Handlebars templates.

Prerequisites

Database Setup

  1. Use SQL Server Management Studio to connect to SQL Server
    • The easiest is to use LocalDb, which is installed with Visual Studio.
      Connect to: (localdb)\MsSqlLocalDb.
    • Create a new database named NorthwindSlim.
    • Download the data file from <http://bit.ly/northwindslim>.
    • Unzip NorthwindSlim.sql and run the script to create tables and populate them with data.

Usage

  1. Create a new .NET Core class library.

    • If necessary, edit the csproj file to update the TargetFramework to 2.2.

    > Note: Using the EF Core toolchain with a .NET Standard class library is currently not supported. Instead, you can add a .NET Standard class library to the same solution as the .NET Core library, then add existing items and select Add As Link to include entity classes.

  2. Add EF Core SQL Server and Tools NuGet packages.

    • Open the Package Manager Console, select the default project and enter:
      • Install-Package Microsoft.EntityFrameworkCore.SqlServer
      • Install-Package Microsoft.EntityFrameworkCore.Design
  3. Add the EntityFrameworkCore.Scaffolding.Handlebars NuGet package:

    • Install-Package EntityFrameworkCore.Scaffolding.Handlebars
  4. Remove Class1.cs and add a ScaffoldingDesignTimeServices class.

    • Implement IDesignTimeServices by adding a ConfigureDesignTimeServices method
      that calls services.AddHandlebarsScaffolding.
    • You can optionally pass a ReverseEngineerOptions enum to indicate if you wish
      to generate only entity types, only a DbContext class, or both (which is the default).
    public class ScaffoldingDesignTimeServices : IDesignTimeServices
    {
        public void ConfigureDesignTimeServices(IServiceCollection services)
        {
            var options = ReverseEngineerOptions.DbContextAndEntities;
            services.AddHandlebarsScaffolding(options);
        }
    }
    
  5. Open a command prompt at the project level and use the EF .NET Core CLI tools to reverse engineer a context and models from an existing database.

    • Get help on dotnet-ef-dbcontext-scaffold at the command line: dotnet ef dbcontext scaffold -h
    • Execute the following command to reverse engineer classes from the NorthwindSlim database:
    dotnet ef dbcontext scaffold "Data Source=(localdb)\MSSQLLocalDB; Initial Catalog=NorthwindSlim; Integrated Security=True" Microsoft.EntityFrameworkCore.SqlServer -o Models -c NorthwindSlimContext -f --context-dir Contexts
    
    • You should see context and/or entity classes appear in the Models folder of the project.
    • You will also see a CodeTemplates folder appear containing Handlebars templates for customizing generation of context and entity type classes.
    • Add -d to the command to use data annotations. You will need to add the System.ComponentModel.Annotations package to a .NET Standard library containing linked entity classes.
  6. You may edit any of the template files which appear under the CodeTemplates folder.

    • For now you can just add some comments, but you may wish to customize the templates in other ways, for example, by inheriting entities from a base class or implementing
      specific interfaces.
    • When you run the dotnet-ef-dbcontext-scaffold command again, you will see your updated reflected in the generated classes.

Handlebars Helpers and Transformers

You can register Handlebars helpers in the ScaffoldingDesignTimeServices where setup takes place.

  • Create a named tuple as shown with myHelper below.
  • The context parameter of the helper method provides model data injected by the Handlebars scaffolding extension.
  • Pass the tuple to the AddHandlebarsHelpers extension method.
  • To use Handlebars helper defined above, add the following to any of the .hbs files within the CodeTemplates folder: {{my-helper}}
  • You may register as many helpers as you wish.

You can pass transform functions to AddHandlebarsTransformers in order to customize generation of entity type definitions, including class names, constructors and properties.

public class ScaffoldingDesignTimeServices : IDesignTimeServices
{
    public void ConfigureDesignTimeServices(IServiceCollection services)
    {
        // Generate both context and entities
        var options = ReverseEngineerOptions.DbContextAndEntities;

        // Register Handlebars helper
        var myHelper = (helperName: "my-helper", helperFunction: (Action<TextWriter, Dictionary<string, object>, object[]>) MyHbsHelper);

        // Add Handlebars scaffolding templates
        services.AddHandlebarsScaffolding(options);

        // Add optional Handlebars helpers
        services.AddHandlebarsHelpers(myHelper);

        // Add Handlebars transformer for Country property
        services.AddHandlebarsTransformers(
            propertyTransformer: e =>
                e.PropertyName == "Country"
                    ? new EntityPropertyInfo("Country", e.PropertyName)
                    : new EntityPropertyInfo(e.PropertyType, e.PropertyName));

        // Add optional Handlebars transformers
        //services.AddHandlebarsTransformers(
        //    entityNameTransformer: n => n + "Foo",
        //    entityFileNameTransformer: n => n + "Foo",
        //    constructorTransformer: e => new EntityPropertyInfo(e.PropertyType + "Foo", e.PropertyName + "Foo"),
        //    propertyTransformer: e => new EntityPropertyInfo(e.PropertyType, e.PropertyName + "Foo"),
        //    navPropertyTransformer: e => new EntityPropertyInfo(e.PropertyType + "Foo", e.PropertyName + "Foo"));
    }

    // Sample Handlebars helper
    void MyHbsHelper(TextWriter writer, Dictionary<string, object> context, object[] parameters)
    {
        writer.Write("// My Handlebars Helper");
    }
}

Generating TypeScript Entities

To generate TypeScript entities simply pass LanguageOptions.TypeScript to AddHandlebarsScaffolding. Since generating a DbContext class is strictly a server-side concern, you should also pass ReverseEngineerOptions.EntitiesOnly to AddHandlebarsScaffolding.

public class ScaffoldingDesignTimeServices : IDesignTimeServices
{
    public void ConfigureDesignTimeServices(IServiceCollection services)
    {
        // Generate both context and entities
        var options = ReverseEngineerOptions.EntitiesOnly;

        // Generate TypeScript files
        var language = LanguageOptions.TypeScript;

        // Add Handlebars scaffolding templates
        services.AddHandlebarsScaffolding(options, language);
    }
}
  • You can also omit c and --context-dir arguments from the EF Core scaffolding command.
dotnet ef dbcontext scaffold "Data Source=(localdb)\MSSQLLocalDB; Initial Catalog=NorthwindSlim; Integrated Security=True" Microsoft.EntityFrameworkCore.SqlServer -o Models -f

Release Notes

See: https://github.com/TrackableEntities/EntityFrameworkCore.Scaffolding.Handlebars/releases/tag/v2.1.0

Showing the top 1 GitHub repositories that depend on EntityFrameworkCore.Scaffolding.Handlebars:

Repository Stars
ErikEJ/EFCorePowerTools
Entity Framework Core Power Tools - reverse engineering, migrations and model visualization for EF Core

Version History

Version Downloads Last updated
3.0.0-preview8 63 8/26/2019
2.1.1 1,642 8/5/2019
2.1.0 677 7/19/2019
2.0.0 942 6/25/2019
1.7.2 14,591 1/6/2019
1.7.1 190 1/5/2019
1.7.0 137 1/3/2019
1.6.0 243 12/17/2018
1.5.1 9,992 7/7/2018
1.5.0 378 6/22/2018
1.4.1 392 7/7/2018
1.4.0 241 6/23/2018
1.1.1 291 6/19/2018
1.1.0 348 6/3/2018
1.0.0 206 5/30/2018
1.0.0-rc3 402 5/26/2018
1.0.0-rc2 227 5/26/2018
1.0.0-rc 216 5/24/2018
1.0.0-beta 1,267 10/25/2017