fix: Repeated Prisma calls in extended Prisma clients

src/hooks/prisma.ts

@@ -99,6 +99,13 @@ function getFunctionInfo(model: string, action: string, moduleId: string) {
   return functionInfos.get(key)!;
 }
 
+interface PrismaCallDetails {
+  model: string;
+  action: string;
+  argsValue: string;
+}
+let lastPrismaCallDetails: PrismaCallDetails | undefined;
+
 function createPrismaClientMethodProxy<T extends (...args: unknown[]) => unknown>(
   prismaClientMethod: T,
   moduleId: string,
@@ -110,11 +117,32 @@ function createPrismaClientMethodProxy<T extends (...args: unknown[]) => unknown
       if (argArray?.length > 0) {
         const requestParams = argArray[0] as PrismaRequestParams;
         if (requestParams.action && requestParams.model) {
-          prismaCall = recording.functionCall(
-            getFunctionInfo(requestParams.model, requestParams.action, moduleId),
-            requestParams.model,
-            [requestParams.args?.data, requestParams.args?.include, requestParams?.args?.where],
-          );
+          // In extended prisma clients, we receive repeated calls
+          // with the same action, module and args. It can be seen
+          // with the example project cal.com. Looks like it's related
+          // to the Prisma client extension mechanism. To prevent filling
+          // appmaps with repeated calls we don't record them if they are
+          // exactly the same with the previous one.
+
+          const funInfo = getFunctionInfo(requestParams.model, requestParams.action, moduleId);
+          // We use JSON.stringify to stringify details deeper in a compact string than
+          // event.ts:resolveParameters() will do.
+          const argsValue = JSON.stringify(requestParams.args);
+
+          const prismaCallDetails = {
+            model: requestParams.model,
+            action: requestParams.action,
+            argsValue,
+          };
+          // Don't record if it's repeated.
+          if (
+            prismaCallDetails.action != lastPrismaCallDetails?.action ||
+            prismaCallDetails.model != lastPrismaCallDetails?.model ||
+            prismaCallDetails.argsValue != lastPrismaCallDetails?.argsValue
+          ) {
+            lastPrismaCallDetails = prismaCallDetails;
+            prismaCall = recording.functionCall(funInfo, requestParams.model, [argsValue]);
+          }
         }
       }