Made category optional on Snippet table

prisma/migrations/20230201191654_cate_on_snipp_optional/migration.sql

@@ -0,0 +1,8 @@
+-- DropForeignKey
+ALTER TABLE `Snippet` DROP FOREIGN KEY `Snippet_category_id_fkey`;
+
+-- AlterTable
+ALTER TABLE `Snippet` MODIFY `category_id` INTEGER NULL;
+
+-- AddForeignKey
+ALTER TABLE `Snippet` ADD CONSTRAINT `Snippet_category_id_fkey` FOREIGN KEY (`category_id`) REFERENCES `Category`(`id`) ON DELETE SET NULL ON UPDATE CASCADE;

prisma/schema.prisma

@@ -29,8 +29,8 @@ model Snippet {
 
   user_id     Int
   user        User          @relation(fields: [user_id], references: [id], onDelete: Cascade, onUpdate: Cascade)
-  category_id Int
+  category_id Int?
-  category    Category      @relation(fields: [category_id], references: [id])
+  category    Category?     @relation(fields: [category_id], references: [id])
   language_id Int
   language    Language      @relation(fields: [language_id], references: [id])
   Snippet_tag Snippet_tag[]