Add Reaction model with associations on Status & Review

server/sequelize/associations/Review.js

@@ -4,6 +4,7 @@ module.exports = models => {
     User,
     PermissionLevel,
     BookReference,
+    Reactions,
   } = models;
 
   Review.belongsTo(User, {
@@ -21,5 +22,11 @@ module.exports = models => {
     onDelete: 'SET NULL',
   });
 
+  Review.hasMany(Reactions.scope('Review'), {
+    foreignKey: 'targetId',
+    constraints: false,
+    as: 'Reactions',
+  });
+
   return Review;
 }

server/sequelize/associations/Status.js

@@ -3,6 +3,7 @@ module.exports = models => {
     Status,
     User,
     ShelfItem,
+    Reactions,
   } = models;
 
   Status.belongsTo(User, {
@@ -20,5 +21,11 @@ module.exports = models => {
     onDelete: 'SET NULL',
   });
 
+  Status.hasMany(Reactions.scope('Status'), {
+    foreignKey: 'targetId',
+    constraints: false,
+    as: 'Reactions',
+  });
+
   return Status;
 }

server/sequelize/models/Reaction.js

@@ -0,0 +1,72 @@
+const Sequelize = require('sequelize');
+
+module.exports = sequelize => sequelize.define('Reaction', {
+  id: {
+    type: Sequelize.INTEGER,
+    primaryKey: true,
+    autoIncrement: true,
+  },
+  userId: {
+    type: Sequelize.INTEGER,
+    allowNull: false,
+    references: {
+      model: sequelize.models.User,
+      key: 'id',
+      deferrable: Sequelize.Deferrable.INITIALLY_IMMEDIATE,
+    },
+  },
+  targetType: {
+    type: Sequelize.ENUM,
+    values: ['Status', 'Review'],
+    allowNull: false,
+    comment: 'The model/table that `targetId` lives in.',
+  },
+  targetId: {
+    type: Sequelize.INTEGER,
+    allowNull: false,
+    comment: 'The id of the `targetType` record this Reaction relates to.',
+  },
+  reactionType: {
+    type: Sequelize.ENUM,
+    values: ['comment', 'like', 'emoji'],
+    allowNull: false,
+    comment: 'Stores what type of reaction this record is: Comment, Like, Emoji',
+  },
+  reaction: {
+    type: Sequelize.TEXT,
+    allowNull: true,
+    comment: 'Stores the Comment or Emoji value of the reaction if not a Like.',
+  },
+
+  // Timestamps
+  createdAt: {
+    type: Sequelize.DATE,
+    allowNull: false,
+    defaultValue: Sequelize.NOW,
+  },
+  updatedAt: {
+    type: Sequelize.DATE,
+    allowNull: false,
+    defaultValue: Sequelize.NOW,
+  },
+}, {
+  indexes: [
+    {
+      fields: ['userId'],
+    },
+    {
+      fields: ['targetType', 'targetId'],
+    },
+    {
+      fields: ['reactionType'],
+    },
+  ],
+  scopes: {
+    Status: {
+      where: { targetType: 'Status' },
+    },
+    Review: {
+      where: { targetType: 'Review' },
+    },
+  }
+});

server/sequelize/models/index.js

@@ -10,6 +10,7 @@ module.exports = sequelize => {
     'Status',
     'Review',
     'Recommendation',
+    'Reaction',
   ];
 
   const models = {};