type providers by ignatandrei · Pull Request #469 · ignatandrei/RSCG_Examples

ignatandrei · 2026-04-07T17:13:16Z

Summary by CodeRabbit

Documentation
- Added a new example project demonstrating how to load Excel data and access it through strongly-typed C# classes using Maestria.TypeProviders, including custom methods for data transformation and output.

coderabbitai · 2026-04-07T17:13:48Z

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📝 Walkthrough

Walkthrough

A new complete example project for Maestria.TypeProviders is added, demonstrating source code generation for Excel-to-typed-code workflows. The example includes configuration metadata, solution/project files, partial class definitions with an ExcelProvider attribute, and a console application that loads and displays Excel data.

Changes

Cohort / File(s)	Summary
Configuration & Metadata `description.json`, `src/DemoExcel.slnx`	Added metadata describing the generator (name, NuGet package, GitHub links, author) and solution file declaring the DemoExcel project reference.
Project Setup `src/DemoExcel/DemoExcel.csproj`	New SDK project targeting `net10.0` with ClosedXML, Maestria.Extensions, and Maestria.TypeProviders dependencies; configures Excel file copy and compiler-generated output paths.
Source Code `src/DemoExcel/MyExcelPerson.cs`, `src/DemoExcel/Person.cs`, `src/DemoExcel/Program.cs`	Added partial `MyExcelPerson` class with `FullName()` method, decorated Person class with `[ExcelProvider]` attribute for RSCG, and console entry point demonstrating loading and iterating Excel data.

Sequence Diagram

sequenceDiagram
    participant Program as Program.Main()
    participant Factory as MyExcelPersonFactory
    participant ExcelFile as MyExcel.xlsx
    participant PersonList as Person[] (In-Memory)
    participant Console as Console Output

    Program->>Factory: Load("MyExcel.xlsx")
    Factory->>ExcelFile: Read Excel data
    ExcelFile-->>Factory: Row data (ID, FirstName, LastName)
    Factory->>PersonList: Materialize to array
    PersonList-->>Program: Person[] collection

    loop For each person
        Program->>Program: person.FullName()
        Program->>Console: Print ID + FullName
        Console-->>Program: Output displayed
    end

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 A spreadsheet tale, now typed with care,
Excel rows transformed through the air,
With Maestria's magic, names align,
Each person's fullness perfectly defined,
From XLSX to code, a bunny's delight! 📊✨

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Title check	❓ Inconclusive	The title 'type providers' is vague and generic, lacking specificity about what is being added or changed within this changeset.	Provide a more descriptive title that clarifies the main contribution, such as 'Add Maestria.TypeProviders example with Excel-to-code generation' or 'Add DemoExcel type provider example project'.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

Create stacked PR
Commit on current branch

🧪 Generate unit tests (beta)

Create PR with unit tests
Commit unit tests in branch Maestria.TypeProviders

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Copilot

Pull request overview

Adds a new Maestria.TypeProviders example demonstrating generating strongly-typed accessors from an Excel template and consuming the generated factory/type in a small console app.

Changes:

Added a DemoExcel console project that loads MyExcel.xlsx via the generated MyExcelPersonFactory and prints the results.
Added a partial MyExcelPerson type with an [ExcelProvider] template annotation and a FullName() helper.
Added the Excel template file and example metadata (description.json) for the generator showcase.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
v2/rscg_examples/Maestria.TypeProviders/src/DemoExcel/Program.cs	Demo entry point that loads data from the generated factory and prints it.
v2/rscg_examples/Maestria.TypeProviders/src/DemoExcel/Person.cs	Declares the annotated partial model for Excel-driven codegen.
v2/rscg_examples/Maestria.TypeProviders/src/DemoExcel/MyExcelPerson.cs	Adds a convenience `FullName()` method to the generated model.
v2/rscg_examples/Maestria.TypeProviders/src/DemoExcel/MyExcel.xlsx	Excel template used by the type provider and runtime loader.
v2/rscg_examples/Maestria.TypeProviders/src/DemoExcel/DemoExcel.csproj	Project configuration + package references + copies the template to output.
v2/rscg_examples/Maestria.TypeProviders/src/DemoExcel.slnx	Solution wrapper for the new demo project.
v2/rscg_examples/Maestria.TypeProviders/description.json	Example metadata describing this generator demo.

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Copilot · 2026-04-07T17:17:27Z

v2/rscg_examples/Maestria.TypeProviders/src/DemoExcel/Program.cs

+
+foreach (var person in persons)
+{
+    Console.WriteLine(person.ID + person.FullName());


The output concatenates person.ID and person.FullName() without any delimiter, which makes the demo output hard to read (e.g., 1John Doe). Consider using string interpolation / formatting to include a separator (space, :, etc.) between the fields.

Suggested change

Console.WriteLine(person.ID + person.FullName());

Console.WriteLine($"{person.ID}: {person.FullName()}");

Copilot · 2026-04-07T17:17:27Z

v2/rscg_examples/Maestria.TypeProviders/src/DemoExcel/Program.cs

+
+Console.WriteLine("Hello, World!");
+var persons = MyExcelPersonFactory.Load("MyExcel.xlsx").ToArray();


MyExcel.xlsx is loaded via a relative path. If the app is executed with a working directory different from the output folder, this will fail to find the file even though it is copied to the output. Consider building the path from AppContext.BaseDirectory (or similar) so the demo runs reliably regardless of the current directory.

Suggested change

Console.WriteLine("Hello, World!");

var persons = MyExcelPersonFactory.Load("MyExcel.xlsx").ToArray();

using System.IO;

Console.WriteLine("Hello, World!");

var excelPath = Path.Combine(AppContext.BaseDirectory, "MyExcel.xlsx");

var persons = MyExcelPersonFactory.Load(excelPath).ToArray();

Copilot · 2026-04-07T17:17:28Z

v2/rscg_examples/Maestria.TypeProviders/src/DemoExcel/Person.cs

+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace DemoExcel;
+


The System, System.Collections.Generic, and System.Text usings are currently unused in this file. Removing them avoids unnecessary clutter and prevents unused-using warnings in stricter build configurations.

Suggested change

using System;

using System.Collections.Generic;

using System.Text;

namespace DemoExcel;

namespace DemoExcel;

Copilot · 2026-04-07T17:17:28Z

v2/rscg_examples/Maestria.TypeProviders/src/DemoExcel/Person.cs

+namespace DemoExcel;
+
+[ExcelProvider(TemplatePath = @"MyExcel.xlsx")]
+public partial class MyExcelPerson


The file name Person.cs defines MyExcelPerson. Renaming the file to match the type (or vice versa) would make the demo easier to navigate and avoid confusion when multiple models are added later.

Suggested change

public partial class MyExcelPerson

public partial class Person

ignatandrei added 3 commits April 4, 2026 09:26

type providers

322bb81

update to latest version

02dd1d2

Update description.json

5b5a35e

Copilot AI review requested due to automatic review settings April 7, 2026 17:13

Copilot started reviewing on behalf of ignatandrei April 7, 2026 17:14 View session

ignatandrei merged commit 35351f0 into main Apr 7, 2026
4 of 5 checks passed

ignatandrei deleted the Maestria.TypeProviders branch April 7, 2026 17:16

Copilot AI reviewed Apr 7, 2026

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type providers#469

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ignatandrei merged 3 commits intomainfrom
Maestria.TypeProviders

ignatandrei commented Apr 7, 2026 •

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Walkthrough

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Sequence Diagram

Estimated code review effort

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❌ Failed checks (1 warning, 1 inconclusive)

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	Console.WriteLine(person.ID + person.FullName());
	Console.WriteLine($"{person.ID}: {person.FullName()}");


		Console.WriteLine("Hello, World!");
		var persons = MyExcelPersonFactory.Load("MyExcel.xlsx").ToArray();

	public partial class MyExcelPerson
	public partial class Person

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Summary by CodeRabbit

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❌ Failed checks (1 warning, 1 inconclusive)

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ignatandrei commented Apr 7, 2026 •

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