feat: include relation in NestedParams

For certain middleware it is necessary to reference the relation for
that nested action. For example instead of deleting a toOne relation a
soft delete middleware may decide instead to unlink the relation and
update it to have a deleted mark which would require both the isList and
the foreign key information stored on the relation.

src/lib/createNestedMiddleware.ts

@@ -12,7 +12,7 @@ if (!Prisma.dmmf) {
   );
 }
 
-const relationsByModel: Record<string, Prisma.DMMF.Field[]> = {};
+export const relationsByModel: Record<string, Prisma.DMMF.Field[]> = {};
 Prisma.dmmf.datamodel.models.forEach((model: Prisma.DMMF.Model) => {
   relationsByModel[model.name] = model.fields.filter(
     (field) => field.kind === "object" && field.relationName

src/lib/types.ts

@@ -44,6 +44,7 @@ export type MiddlewareCall = {
 export type NestedParams = Omit<Prisma.MiddlewareParams, "action"> & {
   action: NestedAction;
   scope?: NestedParams;
+  relation?: Prisma.DMMF.Field;
 };
 
 export type NestedMiddleware<T = any> = (

src/lib/utils/actions.ts

@@ -8,7 +8,7 @@ import {
   Target,
 } from "../types";
 
-import { normaliseRootArgs } from './args';
+import { normaliseRootArgs } from "./args";
 
 export const readActions: NestedReadAction[] = ["include", "select"];
 export const writeActions: NestedWriteAction[] = [
@@ -89,6 +89,7 @@ export function extractNestedWriteActions(
                 runInTransaction,
                 dataPath: [],
                 scope: params,
+                relation,
               },
             }))
           );
@@ -108,6 +109,7 @@ export function extractNestedWriteActions(
             runInTransaction,
             dataPath: [],
             scope: params,
+            relation,
           },
         });
       });
@@ -138,6 +140,7 @@ export function extractNestedReadActions(
         runInTransaction,
         dataPath: [],
         scope: params,
+        relation,
       },
     });
 
@@ -152,6 +155,7 @@ export function extractNestedReadActions(
           runInTransaction,
           dataPath: [],
           scope: params,
+          relation,
         },
       });
     }