Update:Only load collections when needed

server/models/Collection.js

@@ -92,6 +92,73 @@ module.exports = (sequelize) => {
         }
       })
     }
+
+    /**
+     * Get collection by id
+     * @param {string} collectionId 
+     * @returns {Promise<oldCollection|null>} returns null if not found
+     */
+    static async getById(collectionId) {
+      if (!collectionId) return null
+      const collection = await this.findByPk(collectionId, {
+        include: {
+          model: sequelize.models.book,
+          include: sequelize.models.libraryItem
+        },
+        order: [[sequelize.models.book, sequelize.models.collectionBook, 'order', 'ASC']]
+      })
+      if (!collection) return null
+      return this.getOldCollection(collection)
+    }
+
+    /**
+     * Remove all collections belonging to library
+     * @param {string} libraryId 
+     * @returns {Promise<number>} number of collections destroyed
+     */
+    static async removeAllForLibrary(libraryId) {
+      if (!libraryId) return 0
+      return this.destroy({
+        where: {
+          libraryId
+        }
+      })
+    }
+
+    /**
+     * Get all collections for a library
+     * @param {string} libraryId 
+     * @returns {Promise<oldCollection[]>}
+     */
+    static async getAllForLibrary(libraryId) {
+      if (!libraryId) return []
+      const collections = await this.findAll({
+        where: {
+          libraryId
+        },
+        include: {
+          model: sequelize.models.book,
+          include: sequelize.models.libraryItem
+        },
+        order: [[sequelize.models.book, sequelize.models.collectionBook, 'order', 'ASC']]
+      })
+      return collections.map(c => this.getOldCollection(c))
+    }
+
+    static async getAllForBook(bookId) {
+      const collections = await this.findAll({
+        include: {
+          model: sequelize.models.book,
+          where: {
+            id: bookId
+          },
+          required: true,
+          include: sequelize.models.libraryItem
+        },
+        order: [[sequelize.models.book, sequelize.models.collectionBook, 'order', 'ASC']]
+      })
+      return collections.map(c => this.getOldCollection(c))
+    }
   }
 
   Collection.init({