Moved code to /src folder

src/models/spell-model.js

@@ -0,0 +1,24 @@
+const bookshelf = require('../database/bookshelf').bookshelf;
+
+require('./school-model');
+require('./variable-model');
+require('./ingredient-model');
+
+let Spell = bookshelf.Model.extend({
+    tableName: 'spell',
+    hidden: [ 'author_id' ],
+    author() {
+        return this.belongsTo( 'User', 'author_id' );
+    },
+    schools() {
+        return this.belongsToMany( 'School', 'spell_school' );
+    },
+    variables() {
+        return this.belongsToMany( 'Variable', 'spell_variable' );
+    },
+    ingredients() {
+        return this.belongsToMany( 'Ingredient', 'spell_ingredient' );
+    }
+});
+
+module.exports = bookshelf.model('Spell', Spell);