Changes

node_modules/mongoose/lib/helpers/indexes/isIndexEqual.js

@@ -3,8 +3,52 @@
 const get = require('../get');
 const utils = require('../../utils');
 
+/**
+ * Given a Mongoose index definition (key + options objects) and a MongoDB server
+ * index definition, determine if the two indexes are equal.
+ *
+ * @param {Object} key the Mongoose index spec
+ * @param {Object} options the Mongoose index definition's options
+ * @param {Object} dbIndex the index in MongoDB as returned by `listIndexes()`
+ * @api private
+ */
+
 module.exports = function isIndexEqual(key, options, dbIndex) {
-  // If these options are different, need to rebuild the index
+  // Special case: text indexes have a special format in the db. For example,
+  // `{ name: 'text' }` becomes:
+  // {
+  //   v: 2,
+  //   key: { _fts: 'text', _ftsx: 1 },
+  //   name: 'name_text',
+  //   ns: 'test.tests',
+  //   background: true,
+  //   weights: { name: 1 },
+  //   default_language: 'english',
+  //   language_override: 'language',
+  //   textIndexVersion: 3
+  // }
+  if (dbIndex.textIndexVersion != null) {
+    const weights = dbIndex.weights;
+    if (Object.keys(weights).length !== Object.keys(key).length) {
+      return false;
+    }
+    for (const prop of Object.keys(weights)) {
+      if (!(prop in key)) {
+        return false;
+      }
+      const weight = weights[prop];
+      if (weight !== get(options, 'weights.' + prop) && !(weight === 1 && get(options, 'weights.' + prop) == null)) {
+        return false;
+      }
+    }
+
+    if (options['default_language'] !== dbIndex['default_language']) {
+      return dbIndex['default_language'] === 'english' && options['default_language'] == null;
+    }
+
+    return true;
+  }
+
   const optionKeys = [
     'unique',
     'partialFilterExpression',
@@ -17,6 +61,9 @@ module.exports = function isIndexEqual(key, options, dbIndex) {
       continue;
     }
     if (key === 'collation') {
+      if (options[key] == null || dbIndex[key] == null) {
+        return options[key] == null && dbIndex[key] == null;
+      }
       const definedKeys = Object.keys(options.collation);
       const schemaCollation = options.collation;
       const dbCollation = dbIndex.collation;
@@ -45,4 +92,4 @@ module.exports = function isIndexEqual(key, options, dbIndex) {
   }
 
   return true;
-};
+};