如何使用 Prisma 连接多对多关系答案

【问题标题】：How to connect a many to many relationship using Prisma如何使用 Prisma 连接多对多关系
【发布时间】：2022-01-27 11:47:54
【问题描述】：

我正在尝试在 Prisma 多对多关系中创建和连接记录，但连接部分不适用于我。

这是我的 Prisma 模型：

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])
}

这是我正在运行的 primsa 查询：

   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) },
          },
        },
      },
    });

创建一种新成分非常有效，但是当我添加此部分时：

  categories: {
          ingredientcategory: {
            connect: { id: parseInt(categoryId) },
          },
        },

我收到以下错误：

未知参数 ingredientcategory 在 data.categories.ingredientcategory 中，用于 CategoriesOnIngredientsCreateNestedManyWithoutIngredientInput 类型。你的意思是createMany？可用参数：类型 CategoriesOnIngredientsCreateNestedManyWithoutIngredientInput { create?: CategoriesOnIngredientsCreateWithoutIngredientInput |列表 | CategoriesOnIngredientsUncheckedCreateWithoutIngredientInput |列表 connectOrCreate?: CategoriesOnIngredientsCreateOrConnectWithoutIngredientInput |列表 createMany?: CategoriesOnIngredientsCreateManyIngredientInputEnvelope connect?: CategoriesOnIngredientsWhereUniqueInput |列表 }

【问题讨论】：

标签： prisma

【解决方案1】：

您可以尝试执行以下操作：

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()

您将拥有以下内容：

【讨论】：

【解决方案2】：

我设法让它工作，我错过了我的 Prisma 查询中的 create:{}。

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) },
            },
          },
        },
      },
    });

【讨论】：