How can I combine 2 models in sequelize?-CodePudding

I have 2 models, each model has 2 primary keys(langId, topicCode). How can I combine them to select the value?

const field_A = {langId: {type:DataTypes.STRING, primaryKey: true}, topicCode: {type:DataTypes.STRING, primaryKey: true}, data:{type:DataTypes.STRING}}
const field_B = {langId: {type:DataTypes.STRING, primaryKey: true}, topicCode: {type:DataTypes.STRING, primaryKey: true}, storage:{type:DataTypes.STRING}}
Model_A.init(field_A, { timestamps:false, sequelize });
Model_B.init(field_B, { timestamps:false, sequelize });

How can I perform the action as followings by using sequelize associations between models?

SELECT * from Model_A, Model_B where Model_A.langId = Model_B.langId and Model_A.topicCode = Model_B.topicCode
[
{
  langId: 'xx',
  topicCode: 'yy',
  data: 'zz',
  storage: 'pp',
},
{
  langId: 'gg',
  ...
}
]

Thank you.
Best regards.

CodePudding user response：

Sequelize does not support composite keys in associations so you need to define associations with only one of keys and always indicate the on option in include option with conditions for both fields:

association

modelA.belongsTo(modelB, { foreignKey: 'langId' });

query

const modelAList = await ModelA.findAll({
  include: [{
    model: ModelB,
    on: {
      '$ModelA.langId$': Sequelize.col('ModelB.langId'),
      '$ModelA.topicCode$': Sequelize.col('ModelB.topicCode')
    }
  }]
})