需要提供外键使用的列.这些线路上的东西

You need to provide the columns which are used in the foreign key. Something on these lines

  questions.associate = function(models) {
    // associations can be defined here
    models.questions.hasOne(models.question_categories, { foreignKey: 'question_id' });
    models.questions.hasMany(models.question_answers, { foreignKey: 'question_id' });
  };

这将在表 question_categories 中创建一个外键，指向表 questions

This will create a foreign key in table question_categories, pointing to the table questions

question_categories.question_id -> questions.id