[tcgc] add description for created discriminator property (#873)

fix: #872
Azure · May 21, 2024 · ce15072 · ce15072
1 parent daa3b15
commit ce15072
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diff --git a/.chronus/changes/discriminator_doc-2024-4-21-11-13-50.md b/.chronus/changes/discriminator_doc-2024-4-21-11-13-50.md
@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@azure-tools/typespec-client-generator-core"
+---
+
+add description for created discriminator property
diff --git a/packages/typespec-client-generator-core/src/types.ts b/packages/typespec-client-generator-core/src/types.ts
@@ -503,6 +503,7 @@ function addDiscriminatorToModelType(
     const name = discriminatorProperty ? discriminatorProperty.name : discriminator.propertyName;
     model.properties.splice(0, 0, {
       kind: "property",
+      description: `Discriminator property for ${model.name}.`,
       optional: false,
       discriminator: true,
       serializedName: discriminatorProperty

diff --git a/packages/typespec-client-generator-core/test/types.test.ts b/packages/typespec-client-generator-core/test/types.test.ts
@@ -2241,6 +2241,7 @@ describe("typespec-client-generator-core: types", () => {
       const kindProperty = fish.properties[0];
       ok(kindProperty);
       strictEqual(kindProperty.name, "kind");
+      strictEqual(kindProperty.description, "Discriminator property for Fish.");
       strictEqual(kindProperty.kind, "property");
       strictEqual(kindProperty.discriminator, true);
       strictEqual(kindProperty.type.kind, "string");
@@ -2252,6 +2253,7 @@ describe("typespec-client-generator-core: types", () => {
       const sharktypeProperty = shark.properties[0];
       ok(sharktypeProperty);
       strictEqual(sharktypeProperty.name, "sharktype");
+      strictEqual(sharktypeProperty.description, "Discriminator property for Shark.");
       strictEqual(sharktypeProperty.kind, "property");
       strictEqual(sharktypeProperty.discriminator, true);
       strictEqual(sharktypeProperty.type.kind, "string");
@@ -2282,6 +2284,7 @@ describe("typespec-client-generator-core: types", () => {
       const kindProperty = fish.properties[0];
       ok(kindProperty);
       strictEqual(kindProperty.name, "kind");
+      strictEqual(kindProperty.description, "Discriminator property for Fish.");
       strictEqual(kindProperty.kind, "property");
       strictEqual(kindProperty.discriminator, true);
       strictEqual(kindProperty.type.kind, "string");
@@ -2313,6 +2316,7 @@ describe("typespec-client-generator-core: types", () => {
       const kindProperty = fish.properties[0];
       ok(kindProperty);
       strictEqual(kindProperty.name, "kind");
+      strictEqual(kindProperty.description, "Discriminator property for Fish.");
       strictEqual(kindProperty.kind, "property");
       strictEqual(kindProperty.discriminator, true);
       strictEqual(kindProperty.type.kind, "string");
@@ -2498,6 +2502,7 @@ describe("typespec-client-generator-core: types", () => {
       const dogKindProperty = dog.properties[0];
       ok(dogKindProperty);
       strictEqual(dogKindProperty.type, dogKind);
+      strictEqual(dogKindProperty.description, "Discriminator property for Dog.");
     });
 
     it("discriminator", async () => {