Unable to make my Template with Custom Model work ... Please Help!

[vnetonline]

I have made a class following your examples as follows.

using CodegenCS;
using CodegenCS.Models;
using System;
using System.Linq;

namespace Amazing.Module.CodeGen.Templates
{
    public class MyModel : IJsonInputModel
    {
        public string[] Tables { get; set; }
    }

    public class OqtaneModelTemplate : ICodegenStringTemplate<MyModel>
    {
        public FormattableString Render(MyModel schema) => $$"""
        namespace MyNamespace
        {
            {{schema.Tables.Select(t => RenderTable(t))}}
        }
        """;

        FormattableString RenderTable(string table) => $$"""
        /// <summary>
        /// POCO for Users
        /// </summary>
        public class {{table}}
        {

        }
        """;
    }
}

• I am calling the above using the following code

        public async Task<FormattableString> GenerateOqtaneModel()
        {

            MyModel model = new MyModel();
            model.Tables = new string[] { "Patient", "Doctor" };
            var entities = (await _entityRepository.GetEntitiesAsync()).ToList();
            //foreach (var entity in entities)
            //{
            //    model.Tables.Append(entity.Name);
            //}

            OqtaneModelTemplate oqtaneModelTemplate = new OqtaneModelTemplate();
            return oqtaneModelTemplate.Render(model);

        }

• This is the result I get

  namespace MyNamespace
  {{
      {0}
  }}

Why doesn't this work?

[Drizin]

With that code you're just calling your own Render() which just returns a Formattable string.

All the magic happens inside CodegenTextWriter, so you have to create an instance of that and use it to write whatever you want (FormattableString/Func/Action, etc.) CodegenTextWriter goes recursively through your objects and will "dissect" the FormattableString parts (or many other types).

There are different ways of passing the model - check the Unit Tests that get delegates: https://github.com/CodegenCS/CodegenCS/blob/master/src/Core/CodegenCS.Tests/CoreTests/02-DelegateTests.cs

PS: There is no support yet for async (Tasks) callbacks, the main method where you're calling async tasks can't be evaluated by the writer - it can only understand Actions or Funcs

[vnetonline]

Can you please tell me when I create an instance of ICodegenTextWriter

[vnetonline]

I think I got it my code now looks like this

`` public async Task GenerateOqtaneModel() {

        DatabaseSchema databaseSchema = new DatabaseSchema();
        databaseSchema.Tables = new List<Table>();

        var entities = (await _entityRepository.GetEntitiesAsync()).ToList();
        foreach (var entity in entities)
        {
            Table table = new Table();
            table.TableName = entity.Name;
            databaseSchema.Tables.Add(table);
        }

        ICodegenTextWriter writer = new CodegenTextWriter();
        writer.RemoveWhitespaceFromEmptyLines = false;
        writer.LoadTemplate<OqtaneModelTemplate>().Render(databaseSchema);
        return writer.GetContents();

    }

``

• However, I can't do writer.SaveToFile("MyOqtaneModel.cs"); because it is deprecated

[Drizin]

Since you have a single writer: writer.GetContents() returns the string, just save it to file - System.IO.File.WriteAllText(path, contents). If you had a ICodegenContext (holds multiple writers where each one has a filename) then you would use context.SaveToFolder(targetFolder)

[vnetonline]

Is my approach above right ??

Also how can I iterate the files in context and put them in different folders ?

[Drizin]

There are dozens of different ways. Using the LoadTemplate() extension is a nice way because Render will expect the same type that your model requires. If you are invoking other subtemplates from "inside" the interpolated string then you would have to use interpolation (there are also a few different ways of doing that, but in general you just embed the delegate).

But I don't think you have to map from your model to the DatabaseSchema model. DatabaseSchema is there as a generic model to extract and hold the schema of a MSSQL, but if you already have your own model you can probably just use it.

[Drizin]

Also how can I iterate the files in context and put them in different folders ?

https://github.com/CodegenCS/CodegenCS/blob/master/src/Core/CodegenCS.Tests/CoreTests/10-ContextTests.cs#L68-L70

var w1 = _ctx["Subfolder/File1.cs"];
var w2 = _ctx["Subfolder/File2.cs"];
//w1.Write(...)
...
_ctx.SaveToFolder(parentFolder);

[vnetonline]

Thank you for your help ... this toolkit is exactly what I have been looking for brilliant!!!