Sequelize: Using include for a joined table - mysql

Question

I have 4 models: User, Skill, SkillToLearn, and SkillToTeach. The SkillToLearn and SkillToTeach contain two columns userId and skillId to keep track of a skill (given by skillId) that a user (given by userId) wants to learn or teach.
My goal is to use Sequelize's include statement such that I can return all users' data, including a list of skills they are learning and a list of skills they are teaching. I want a response similar to the following:
[
{
"id": 1,
"username": "janedoe",
"skillsLearning": [
{
"skillId": 1,
"name": "arts"
}
],
"skillsTeaching": [
{
"skillId": 2,
"name": "cooking"
}
]
}
]
However, instead, I'm getting the following response:
[
{
"id": 1,
"username": "janedoe",
"skillsLearning": [
{
"skillId": 1,
"Skill": {
"name": "arts"
}
}
],
"skillsTeaching": [
{
"skillId": 2,
"Skill": {
"name": "cooking"
}
}
]
}
]
I have tried to include Skill instead of SkillToLearn and SkillToTeach but I got an error saying that Skill is not associated to User. I am uncertain if my schemas and associations are incorrect.
User.js
const User = sequelize.define("User", {
username: {
type: DataTypes.STRING,
allowNull: false,
unique: true
},
email: {
type: DataTypes.STRING,
allowNull: false,
unique: true,
validate: {
isEmail: true
}
},
password: {
type: DataTypes.STRING,
allowNull: false
},
description: {
type: DataTypes.TEXT
}
}, {
freezeTableName: true
});
User.associate = function (models) {
User.hasMany(models.SkillToLearn, {
as: "skillsLearning",
onDelete: "cascade",
foreignKey: "userId",
sourceKey: "id"
});
User.hasMany(models.SkillToTeach, {
as: "skillsTeaching",
onDelete: "cascade",
foreignKey: "userId",
sourceKey: "id"
});
};
Skill.js
const Skill = sequelize.define("Skill", {
name: {
type: DataTypes.STRING,
allowNull: false,
unique: true
}
}, {
freezeTableName: true
});
Skill.associate = function (models) {
Skill.hasMany(models.SkillToLearn, {
as: "usersLearning",
onDelete: "cascade",
foreignKey: "skillId",
sourceKey: "id"
});
Skill.hasMany(models.SkillToTeach, {
as: "usersTeaching",
onDelete: "cascade",
foreignKey: "skillId",
sourceKey: "id"
});
};
SkillToLearn.js
const SkillToLearn = sequelize.define("SkillToLearn", {
userId: {
type: DataTypes.INTEGER,
allowNull: false,
primaryKey: true
},
skillId: {
type: DataTypes.INTEGER,
allowNull: false,
primaryKey: true
}
}, {
freezeTableName: true
});
SkillToLearn.associate = function (models) {
SkillToLearn.belongsTo(models.User, {
foreignKey: "userId",
targetKey: "id"
});
SkillToLearn.belongsTo(models.Skill, {
foreignKey: "skillId",
targetKey: "id"
});
};
SkillToTeach.js
const SkillToTeach = sequelize.define("SkillToTeach", {
userId: {
type: DataTypes.INTEGER,
allowNull: false,
primaryKey: true
},
skillId: {
type: DataTypes.INTEGER,
allowNull: false,
primaryKey: true
}
}, {
freezeTableName: true
});
SkillToTeach.associate = function (models) {
SkillToTeach.belongsTo(models.User, {
foreignKey: "userId",
targetKey: "id"
});
SkillToTeach.belongsTo(models.Skill, {
foreignKey: "skillId",
targetKey: "id"
});
};
dataRoutes.js
db.User
.findAll({
attributes: ["id", "username"],
include: [
{
model: db.SkillToLearn,
as: "skillsLearning",
attributes: ["skillId"],
include: [
{
model: db.Skill,
attributes: ["name"]
}
]
},
{
model: db.SkillToTeach,
as: "skillsTeaching",
attributes: ["skillId"],
include: [
{
model: db.Skill,
attributes: ["name"]
}
]
}
]
})
.then(results => res.json(results));
});
Is there a way for me to get the skill's name without having it in an object? Should I just do multiple queries and construct the response using my own object literal? Thank you!