In the process of generating a fresh element, my foreign key is consistently left as null. This behavior is observed when working with

I have a User model and Team model that I am looking to connect.

User.js Model

"use strict";
module.exports = sequelize => {
  const User = sequelize.define(
     "User",
    {
      id: {
        type: Sequelize.UUID,
        defaultValue: Sequelize.UUIDV1,
        primaryKey: true,
        allowNull: false
      },
        ...more fields
    }
    { tableName: "Users", timestamps: true }
  );

User.associate = function(models) {
   
    User.hasMany(models.Skill, {
      foreignKey: "userId"
    });
    
    User.hasMany(models.Team, {
      foreignKey: "userId"
    });
  };

  return User;
};

Team.js Model

"use strict";
module.exports = (sequelize, DataTypes) => {
  const Team = sequelize.define(
    "Team",
    {
      id: {
        allowNull: false,
        autoIncrement: true,
        primaryKey: true,
        type: DataTypes.INTEGER
      },
       ...more fields
    },
    { tableName: "Teams", timestamps: true }
  );

  Team.associate = function(models) {

    Team.belongsTo(models.User, {
      foreignKey: "userId"
    });
  };
  return Team;
};

The column userId in the team's table shows null despite setting the correct type (uuid).

When defining associations with no options, the userId column remains null.

User.associate = function(models) {
    User.hasMany(models.Team);
}

Interestingly, the same code works for another table called "Skills".

"use strict";
module.exports = (sequelize, DataTypes) => {
  const Skill = sequelize.define(
    "Skill",
    {
      id: {
        type: DataTypes.INTEGER,
        allowNull: false,
        autoIncrement: true,
        primaryKey: true
      },
    },
    { tableName: "Skills", timestamps: true }
  );

  Skill.associate = models => {
    Skill.belongsTo(models.User, {
      foreignKey: "userId"
    });
  };

  return Skill;
};

Methods used to create a team are showing an issue with the userId column.

// Create a new team
exports.createTeam = async (req, res) => {
 
  const userId = req.session.passport.user.id;

  const { title } = req.body;

  
  const existingTeam = await models.Team.findOne({
    where: { title: title, userId: userId }
  });

  if (existingTeam !== null) {
   
    ...
    return;
  }

  const defaultTeamValues = {
    title: title,
    ...
  };

 
  const team = await models.Team.create(defaultTeamValues);

 
  res.status(200).json(team);
};

An image of the newly created team record displaying a null value in the userId column. https://i.stack.imgur.com/n9NYU.png

Although tables and constraints seem correct in pgAdmin 4, the userId issue persists.

Despite referencing documentation and searching for solutions, the userId problem remains unresolved. What steps am I missing?

Answer №1

After some investigation, I managed to identify the issue. Instead of using

// Look for existing team
const existingTeam = await models.Team.findOne({
  where: { title: title, userId: userId }
});

if (existingTeam !== null) {
  ...
  return;
}

// No existing team was found with that title and created by that user.

// Create it.
const team = await models.Team.create(defaultTeamValues);

I made a switch to this approach.

const team = await models.Team.findOrCreate({
    where: {
      title: title,
      userId: userId
    },
    // title and userId will be appended to defaults on create.
    defaults: defaultTeamValues
  });

The key difference is that findOrCreate will combine the values in the where query with the default values provided.

This method was previously used when adding new skills, which explains why my Skills records had the userId while Teams did not.

At this stage, I am uncertain if my associations are functioning correctly because I am essentially just inserting the userId value into the new record.

I will now focus on going through the documentation again and conducting further testing.

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