handle if references already exists

prisma-fmt/src/code_actions/relations.rs

@@ -282,7 +282,11 @@ pub(super) fn add_referencing_side_relation(
                 .find(|arg| arg.value.is_string())
                 .map_or(Default::default(), |arg| format!("{arg}, "));
 
-            let relation_attr = format!("@relation({}fields: [], references: [])", name);
+            let references = initiating_field
+                .referenced_fields()
+                .map_or("references: []".to_owned(), |refs| format!("references: [{}]", refs.map(|r| r.name()).collect::<Vec<&str>>().join(", ")));
+
+            let relation_attr = format!("@relation({}fields: [], {})", name, references);
             let range = super::span_to_range(attr.span(), ctx.initiating_file_source());
 
             TextEdit {

prisma-fmt/tests/code_actions/scenarios/add_missing_relation_attribute_args_references/result.json

@@ -0,0 +1,41 @@
+[
+  {
+    "title": "Add relation attribute for relation field",
+    "kind": "quickfix",
+    "diagnostics": [
+      {
+        "range": {
+          "start": {
+            "line": 3,
+            "character": 4
+          },
+          "end": {
+            "line": 4,
+            "character": 0
+          }
+        },
+        "severity": 1,
+        "message": "Error parsing attribute \"@relation\": The relation field `organization` on Model `user` must specify the `fields` argument in the @relation attribute. You can run `prisma format` to fix this automatically."
+      }
+    ],
+    "edit": {
+      "changes": {
+        "file:///path/to/schema.prisma": [
+          {
+            "range": {
+              "start": {
+                "line": 3,
+                "character": 33
+              },
+              "end": {
+                "line": 3,
+                "character": 60
+              }
+            },
+            "newText": "@relation(fields: [], references: [id])"
+          }
+        ]
+      }
+    }
+  }
+]

prisma-fmt/tests/code_actions/scenarios/add_missing_relation_attribute_args_references/schema.prisma

@@ -0,0 +1,10 @@
+model user {
+    id             String        @id
+    email          String        @unique
+    organization   organization? @relation(references: [id])
+}
+
+model organization {
+    id        String   @id
+    users     user[]
+}

prisma-fmt/tests/code_actions/tests.rs

@@ -17,6 +17,7 @@ scenarios! {
     add_missing_relation_attribute_mongodb
     add_missing_relation_attribute_args
     add_missing_relation_attribute_args_self
+    add_missing_relation_attribute_args_references
     one_to_many_referenced_side_misses_unique_single_field
     one_to_many_referenced_side_misses_unique_single_field_multifile
     one_to_many_referenced_side_misses_unique_single_field_broken_relation