fix(lib): Handle enums as query parameters #133

Author: PerfectlyNormal

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Better support for generic types (#123)
 
+### Fixed
+
+- Allow enums to be used as query parameters in API clients (#133)
+
 ## [0.16.0] - 2024-12-17
 
 ### Added

TypeContractor.Tests/TypeScript/ApiClientWriterTests.cs

@@ -185,6 +185,59 @@ public void Writes_Get_With_Route()
 			.And.NotContain("url.searchParams.append(");
 	}
 
+	[Fact]
+	public void Handles_Get_With_Route_And_Query_Parameters()
+	{
+		// Arrange
+		var apiClient = new ApiClient("TestClient", "TestController", "test", null);
+		apiClient.AddEndpoint(new ApiClientEndpoint("getLatestId", "latest/{year}", EndpointMethod.GET, null, typeof(Guid), false,
+				[new EndpointParameter("year", typeof(int), null, false, false, true, false, false, false, false, false),
+				 new EndpointParameter("reverse", typeof(bool?), null, false, false, false, true, false, false, false, true)], null));
+
+		// Act
+		var result = Sut.Write(apiClient, [], _converter, true, _templateFn, Casing.Pascal);
+
+		// Assert
+		var file = File.ReadAllText(result).Trim();
+		file.Should()
+			.NotBeEmpty()
+			.And.Contain("import { z } from 'zod';")
+			.And.Contain("export class TestClient {")
+			.And.Contain("public async getLatestId(year: number, reverse: boolean | undefined, cancellationToken: AbortSignal = null): Promise<string> {")
+			.And.Contain("const url = new URL(`test/latest/${year}`, window.location.origin);")
+			.And.Contain("if (!!reverse)")
+			.And.Contain("url.searchParams.append('reverse', reverse.toString());");
+	}
+
+	[Fact]
+	public void Handles_Enum_As_Query_Parameter()
+	{
+		// Arrange
+		var outputTypes = new List<OutputType>
+		{
+			_converter.Convert(typeof(ReportType))
+		};
+
+		var apiClient = new ApiClient("TestClient", "TestController", "test", null);
+		apiClient.AddEndpoint(new ApiClientEndpoint("getLatestId", "latest/{year}", EndpointMethod.GET, null, typeof(Guid), false,
+				[new EndpointParameter("year", typeof(int), null, false, false, true, false, false, false, false, false),
+				 new EndpointParameter("reportType", typeof(ReportType), null, false, false, false, true, false, false, false, false)], null));
+
+		// Act
+		var result = Sut.Write(apiClient, outputTypes, _converter, true, _templateFn, Casing.Pascal);
+
+		// Assert
+		var file = File.ReadAllText(result).Trim();
+		file.Should()
+			.NotBeEmpty()
+			.And.Contain("import { z } from 'zod';")
+			.And.Contain("export class TestClient {")
+			.And.Contain("public async getLatestId(year: number, reportType: ReportType, cancellationToken: AbortSignal = null): Promise<string> {")
+			.And.Contain("const url = new URL(`test/latest/${year}`, window.location.origin);")
+			.And.NotContain("if (!!reportType)")
+			.And.Contain("url.searchParams.append('reportType', reportType.toString());");
+	}
+
 	[Fact]
 	public void Unpacks_Complex_Object_To_Query()
 	{
@@ -290,6 +343,12 @@ private class PaginatedRequest
 		public int PageSize { get; set; }
 	}
 
+	private enum ReportType
+	{
+		Summary = 0,
+		Detailed = 1,
+	}
+
 	private MetadataLoadContext BuildMetadataLoadContext()
 	{
 		// Get the array of runtime assemblies.

TypeContractor/Helpers/CasingHelpers.cs

@@ -1,4 +1,4 @@
-using System.Globalization;
+using System.Globalization;
 using System.Text;
 using System.Text.RegularExpressions;
 

TypeContractor/TypeScript/ApiClientWriter.cs

@@ -91,6 +91,12 @@ public string Write(ApiClient apiClient, IEnumerable<OutputType> allTypes, TypeS
 						continue;
 					}
 
+					if (outputType.IsEnum)
+					{
+						queryParamsDto.Add(new QueryParameterTemplateDto(queryParam.Name, true, false, false, queryParam.IsOptional, null));
+						continue;
+					}
+
 					foreach (var property in outputType.Properties ?? [])
 					{
 						queryParamsDto.Add(new QueryParameterTemplateDto(queryParam.Name, false, property.IsNullable, false, queryParam.IsOptional, property.DestinationName));