feat: implement cascading deletion for related records in delete

adminforth/modules/configValidator.ts

@@ -618,7 +618,13 @@ export default class ConfigValidator implements IConfigValidator {
             errors.push(`Resource "${res.resourceId}" column "${col.name}" isArray is enabled but suggestOnCreate is not an array`);
           }
         }
-
+        if (col.foreignResource){
+          if (col.foreignResource.onDelete){
+            if (col.foreignResource.onDelete !== 'cascade' && col.foreignResource.onDelete !== 'setNull'){
+              errors.push (`Wrong delete strategy you can use 'onDelete' or 'cascade'`);
+            }
+          }
+        }
         if (col.foreignResource) {
           if (!col.foreignResource.resourceId) {
             // resourceId is absent or empty

adminforth/modules/restApi.ts

@@ -1464,8 +1464,26 @@ export default class AdminForthRestAPI implements IAdminForthRestAPI {
             if (!record){
                 return { error: `Record with ${body['primaryKey']} not found` };
             }
-            if (resource.options.allowedActions.delete === false) {
+            if (!resource.options.allowedActions.delete) {
                 return { error: `Resource '${resource.resourceId}' does not allow delete action` };
+            } 
+            const childResources = this.adminforth.config.resources.filter(r => r.columns.some(c => c.foreignResource?.resourceId === resource.resourceId)); 
+            if (childResources.length){
+              for (const childRes of childResources) {
+                const foreignResourceColumn = childRes.columns.find(c => c.foreignResource?.resourceId === resource.resourceId);
+                if (!foreignResourceColumn.foreignResource.onDelete) continue;
+                const onDeleteStrategy = foreignResourceColumn.foreignResource.onDelete;    
+                const childRecords = await this.adminforth.resource(childRes.resourceId).list(Filters.EQ(foreignResourceColumn.name, body['primaryKey']))
+                if (onDeleteStrategy === 'cascade') {
+                  for (const childRecord of childRecords) {
+                    await this.adminforth.resource(childRes.resourceId).delete(childRecord.id);
+                  }
+                } else if (onDeleteStrategy === 'setNull') {
+                  for (const childRecord of childRecords) {
+                    await this.adminforth.resource(childRes.resourceId).update(childRecord.id, {[foreignResourceColumn.name]: null});
+                  }
+                }
+              }
             }
 
             const { allowedActions } = await interpretResource(

adminforth/types/Back.ts

@@ -2037,6 +2037,7 @@ export interface AdminForthForeignResource extends AdminForthForeignResourceComm
       afterDatasourceResponse?: AfterDataSourceResponseFunction | Array<AfterDataSourceResponseFunction>,
     },
   },
+  onDelete: 'cascade' | 'setNull'
 }
 
 export type ShowInModernInput = {