我不明白为什么我的 api 调用此列而不是 courseSection.courseId。来自 postman
我正在使用 AngularJs、PostgresSQL、NodeJs 和 Sequelize ORM 构建我的项目。
这是我的 course.contorller.js 的一部分:
const db = require("../models");
const Course = db.course;
//view course catalogue
exports.retrieveAll = (req, res) => {
Course.findAll({
include: [{
model: db.courseSection,
as: "courseSection"
}, {
model: db.category,
as: "category"
}]
})
.then(data => {
res.send(data);
})
.catch(err => {
res.status(500).send({
message: err.message
});
}); };
module.exports = (sequelize, Sequelize) => {
const Course = sequelize.define(
"course",
{
courseId: {
type: Sequelize.INTEGER,
autoIncrement: true,
primaryKey: true,
},
name: {
type: Sequelize.STRING,
allowNull: false,
validate: {
notEmpty: true,
},
},
description: {
type: Sequelize.STRING,
},
creditPrice: {
type: Sequelize.INTEGER,
},
isArchived: {
type: Sequelize.BOOLEAN,
defaultValue: false,
},
isDraft: {
type: Sequelize.BOOLEAN,
},
level: {
type: Sequelize.ENUM({
values: [
"PRIMARY 1",
"PRIMARY 2",
"PRIMARY 3",
"PRIMARY 4",
"PRIMARY 5",
"PRIMARY 6",
],
}),
},
createdAt: {
type: Sequelize.DATE,
},
updatedAt: {
type: Sequelize.DATE,
},
},
{
classMethods: {
associate: function (models) {
Course.hasMany(models.CourseSection, {
foreignKey: "courseId",
onDelete: "CASCADE",
});
Course.hasMany(models.Material, {
foreignKey: "courseId",
onDelete: "CASCADE",
});
Course.hasMany(models.Review, {
foreignKey: "courseId",
onDelete: "CASCADE",
});
Course.hasMany(models.Enrolment, {
foreignKey: "courseId",
onDelete: "CASCADE",
});
Course.belongsTo(models.Category, {
foreignKey: "categoryId",
onDelete: "CASCADE",
});
Course.belongsTo(models.User, {
foreignKey: "userId",
onDelete: "CASCADE",
});
},
},
}
);
return Course;
};
module.exports = (sequelize, Sequelize) => {
const CourseSection = sequelize.define(
"courseSection",
{
sectionId: {
type: Sequelize.INTEGER,
autoIncrement: true,
primaryKey: true,
},
name: {
type: Sequelize.STRING,
allowNull: false,
validate: {
notEmpty: true,
},
},
isArchived: {
type: Sequelize.BOOLEAN,
defaultValue: false,
},
createdAt: {
type: Sequelize.DATE,
},
updatedAt: {
type: Sequelize.DATE,
},
},
{
classMethods: {
associate: function (models) {
CourseSection.belongsTo(models.Course, {
foreignKey: "courseId",
onDelete: "CASCADE",
});
},
},
}
);
return CourseSection;
};
"use strict";
//npx sequelize migration:generate --name course
module.exports = {
up: async (queryInterface, Sequelize) => {
return queryInterface.createTable("course", {
courseId: {
allowNull: false,
type: Sequelize.INTEGER,
autoIncrement: true,
primaryKey: true,
},
categoryId: {
type: Sequelize.INTEGER,
onDelete: "CASCADE",
references: {
model: "category",
key: "categoryId",
},
},
userId: {
type: Sequelize.INTEGER,
onDelete: "CASCADE",
references: {
model: "user",
key: "userId",
},
},
name: {
type: Sequelize.STRING,
allowNull: false,
validate: {
notEmpty: true,
},
},
description: {
type: Sequelize.STRING,
},
creditPrice: {
type: Sequelize.INTEGER,
},
isArchived: {
type: Sequelize.BOOLEAN,
defaultValue: false,
},
isDraft: {
type: Sequelize.BOOLEAN,
},
level: {
type: Sequelize.ENUM({
values: [
"PRIMARY 1",
"PRIMARY 2",
"PRIMARY 3",
"PRIMARY 4",
"PRIMARY 5",
"PRIMARY 6",
],
}),
},
createdAt: {
type: Sequelize.DATE,
},
updatedAt: {
type: Sequelize.DATE,
},
});
},
down: async (queryInterface, Sequelize) => {
return queryInterface.dropTable("course");
},
};
"use strict";
module.exports = {
up: async (queryInterface, Sequelize) => {
return queryInterface.createTable("courseSection", {
sectionId: {
type: Sequelize.INTEGER,
autoIncrement: true,
primaryKey: true,
},
name: {
type: Sequelize.STRING,
allowNull: false,
validate: {
notEmpty: true,
},
},
courseId: {
type: Sequelize.INTEGER,
onDelete: "CASCADE",
references: {
model: "course",
key: "courseId",
},
},
isArchived: {
type: Sequelize.BOOLEAN,
defaultValue: false,
},
createdAt: {
type: Sequelize.DATE,
},
updatedAt: {
type: Sequelize.DATE,
},
});
},
down: async (queryInterface, Sequelize) => {
return queryInterface.dropTable("courseSection");
},
};
我的 postgres 表:
当我执行 localhost:3000/courses/course 时，我的 vscode 显示以下错误:
Executing (default): SELECT "course"."courseId", "course"."name", "course"."description", "course"."creditPrice", "course"."isArchived", "course"."isDraft", "course"."level", "course"."createdAt", "course"."updatedAt", "course"."categoryCategoryId", "course"."categoryId", "course"."userId", "course"."userUserId", "courseSection"."sectionId" AS "courseSection.sectionId", "courseSection"."name" AS "courseSection.name", "courseSection"."isArchived" AS "courseSection.isArchived", "courseSection"."createdAt" AS "courseSection.createdAt", "courseSection"."updatedAt" AS "courseSection.updatedAt", "courseSection"."courseCourseId" AS "courseSection.courseCourseId", "courseSection"."courseId" AS "courseSection.courseId", "category"."categoryId" AS "category.categoryId", "category"."isArchived" AS "category.isArchived", "category"."name" AS "category.name", "category"."createdAt" AS "category.createdAt", "category"."updatedAt" AS "category.updatedAt" FROM "course" AS "course" LEFT OUTER JOIN "courseSection" AS "courseSection" ON "course"."courseId" = "courseSection"."courseCourseId" LEFT OUTER JOIN "category" AS "category" ON "course"."categoryId" = "category"."categoryId";
过去 2 天我一直在解决这个问题，老实说我不知道我哪里出错了。我希望任何人都可以帮助我。
最佳答案
您定义了 courseSection 和 course 之间的关联两次:
associate 方法(正确的) index.js 选项 我想您只需要删除
foreignKey 中的关联，然后在 index.js 中调用模型的 associate 方法。就像是
db.category.associate(db.models);
// and so on
关于node.js - Sequelize PostgresQL - 列不存在时，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/66398467/