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createColumn-foreignKey.js
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createColumn-foreignKey.js
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"use strict";
/**
* This adds a column on the SOURCE model for TARGET id in a 1:M relationship
*
* An example is a 1:M relationship between "Task" and "User" where a "Task"
* belongs to a single "User"
*
* SOURCE (1) -> TARGET (M)
* |-> TARGET (M)
* |-> TARGET (M)
*/
// Step 1: `$ node_modules/.bin/sequelize migration:generate --name add-userid-to-task`
// Step 2: copy this file into the newly created file
// Step 3: `$ node_modules/.bin/sequelize db:migrate`
// === SET THESE ===
// This is the name of your "source" model that is the (1) in the relationship
const SOURCE_MODEL_NAME = 'Task';
const TARGET_MODEL_NAME = 'User';
// === DO NOT SET THESE ===
// Get the real table name by initializing a sequelize instance
// By default we will use the field name (TARGET model + "Id")
const models = require(__dirname + '/../models')
const SOURCE_TABLE_NAME = models[SOURCE_MODEL_NAME].getTableName()
const TARGET_TABLE_NAME = models[TARGET_MODEL_NAME].getTableName()
const TARGET_FIELD_NAME = TARGET_MODEL_NAME + 'Id'
module.exports = {
up: function(migration, DataTypes, done) {
migration.addColumn(
SOURCE_TABLE_NAME,
TARGET_FIELD_NAME,
{
type: DataTypes.INTEGER,
references: {
model: TARGET_TABLE_NAME,
key: "id"
},
onDelete: 'cascade'
}
);
done();
},
down: function(migration, DataTypes, done) {
migration.removeColumn(SOURCE_TABLE_NAME, TARGET_FIELD_NAME);
done();
}
};