How to connect a many to many relationship using Prisma - prisma

Question

I am trying to create and connect a record in a Prisma many to many relationship, but the connection part is not working for me.
Here are my Prisma models:
model Ingredient {
id Int #id #default(autoincrement())
name String
createdAt DateTime #default(now())
calories Int
protein Int
fat Int
carbs Int
netCarbs Int
metricQuantity Int
metricUnit String
imperialQuantity Int
imperialUnit String
recipes IngredientsOnRecipes[]
categories CategoriesOnIngredients[]
}
model IngredientCategory {
id Int #id #default(autoincrement())
name String
ingredients CategoriesOnIngredients[]
}
model CategoriesOnIngredients {
ingredient Ingredient #relation(fields: [ingredientId], references: [id])
ingredientId Int // relation scalar field (used in the `#relation` attribute above)
ingredientCategory IngredientCategory #relation(fields: [ingredientCategoryId], references: [id])
ingredientCategoryId Int // relation scalar field (used in the `#relation` attribute above)
assignedAt DateTime #default(now())
##id([ingredientId, ingredientCategoryId])
}
Here is the primsa query I am running:
const ingredient = await prisma.ingredient.create({
data: {
name: title,
metricQuantity: parseInt(quantityMetric),
metricUnit: unitMetric,
imperialQuantity: parseInt(quantityImperial),
imperialUnit: unitImperial,
calories: parseInt(calories),
netCarbs: parseInt(netCarbs),
carbs: parseInt(carbs),
protein: parseInt(protein),
fat: parseInt(fat),
categories: {
ingredientcategory: {
connect: { id: parseInt(categoryId) },
},
},
},
});
Creating a new ingredient works perfectly, but when I add this section:
categories: {
ingredientcategory: {
connect: { id: parseInt(categoryId) },
},
},
I get the following error:
Unknown arg ingredientcategory in data.categories.ingredientcategory for type CategoriesOnIngredientsCreateNestedManyWithoutIngredientInput. Did you mean createMany? Available args:
type CategoriesOnIngredientsCreateNestedManyWithoutIngredientInput {
create?: CategoriesOnIngredientsCreateWithoutIngredientInput | List | CategoriesOnIngredientsUncheckedCreateWithoutIngredientInput | List
connectOrCreate?: CategoriesOnIngredientsCreateOrConnectWithoutIngredientInput | List
createMany?: CategoriesOnIngredientsCreateManyIngredientInputEnvelope
connect?: CategoriesOnIngredientsWhereUniqueInput | List
}

Answer 1

You can try executing the following:
const { PrismaClient } = require('#prisma/client')
const prisma = new PrismaClient()
const saveData = async () => {
const ingredient = await prisma.ingredient.create({
data: {
name: 'ingredient1',
categories: {
create: {
ingredientCategory: {
create: {
name: 'category1',
},
}
}
},
},
select: {
id: true,
name: true,
categories: {
select: {
ingredientId: true,
ingredientCategory: true,
}
},
},
});
console.log(JSON.stringify(ingredient, null, 2));
}
saveData()
And you will have the following:

Answer 2

I managed to get it to work, I had missed create:{} from my Prisma query.
const ingredient = await prisma.ingredient.create({
data: {
name: title,
metricQuantity: parseInt(quantityMetric),
metricUnit: unitMetric,
imperialQuantity: parseInt(quantityImperial),
imperialUnit: unitImperial,
calories: parseInt(calories),
netCarbs: parseInt(netCarbs),
carbs: parseInt(carbs),
protein: parseInt(protein),
fat: parseInt(fat),
categories: {
create: {
ingredientCategory: {
connect: { id: parseInt(categoryId) },
},
},
},
},
});