Adding data-model example that enforces referential integrity

examples/enforce-referential-integrity/app.js

+/*jslint node:true */
+"use strict";
+
+var Sequelize = require('sequelize');
+
+// initialize database connection
+var sequelize = new Sequelize('testsequelize', 'testsequelize', 'testsequelize', {
+    dialect: 'postgres',
+    port: 5432,
+    define: {
+        freezeTableName: true
+    }
+});
+
+// load models
+var models = [
+    'Trainer',
+    'Series',
+    'Video'
+];
+
+models.forEach(function(model) {
+    module.exports[model] = sequelize.import(__dirname + '/' + model);
+});
+
+// describe relationships
+(function(m) {
+    m.Series.hasOne(m.Video);
+    m.Trainer.hasMany(m.Series);
+})(module.exports);
+
+// export connection
+module.exports.sequelize = sequelize;
\ No newline at end of file

examples/enforce-referential-integrity/models/Series.js

+/*jslint node:true */
+"use strict";
+
+module.exports = function(sequelize, DataTypes) {
+    return sequelize.define('Series', {
+        title: {
+            type: DataTypes.STRING
+        },
+        sub_title: {
+            type: DataTypes.STRING
+        },
+        description: {
+            type: DataTypes.TEXT
+        },
+        // Set FK relationship (hasMany) with `Trainer`
+        trainer_id: {
+            type: DataTypes.INTEGER,
+            references: "Trainer",
+            referencesKey: 'id'
+        }
+    }, {
+        // don't need timestamp attributes for this model
+        timestamps: false,
+        underscored: true
+    });
+};

examples/enforce-referential-integrity/models/Trainer.js

+/*jslint node:true */
+"use strict";
+
+module.exports = function(sequelize, DataTypes) {
+    return sequelize.define('Trainer', {
+        first_name: {
+            type: DataTypes.STRING
+        },
+        last_name: {
+            type: DataTypes.STRING
+        }
+    }, {
+        // don't need timestamp attributes for this model
+        timestamps: false,
+        underscored: true
+    });
+};

examples/enforce-referential-integrity/models/Video.js

+/*jslint node:true */
+"use strict";
+
+module.exports = function(sequelize, DataTypes) {
+    return sequelize.define('Video', {
+        title: {
+            type: DataTypes.STRING
+        },
+        sequence: {
+            type: DataTypes.INTEGER
+        },
+        description: {
+            type: DataTypes.TEXT
+        },
+        // set relationship (hasOne) with `Series`
+        series_id: {
+            type: DataTypes.INTEGER,
+            references: "Series",
+            referencesKey: 'id'
+        }
+    }, {
+        // don't need timestamp attributes for this model
+        timestamps: false,
+        underscored: true
+    });
+};