Created function to remove an index

lib/datastore.js

@@ -118,6 +118,23 @@ Datastore.prototype.ensureIndex = function (options, cb) {
 };
 
 
+/**
+ * Remove an index
+ * @param {String} fieldName
+ * @param {Function} cb Optional callback, signature: err 
+ */
+Datastore.prototype.removeIndex = function (fieldName, cb) {
+  var callback = cb || function () {};
+  
+  delete this.indexes[fieldName];
+  
+  this.persistence.persistNewState([{ $$indexRemoved: fieldName }], function (err) {
+    if (err) { return callback(err); }
+    return callback(null);
+  });  
+};
+
+
 /**
  * Add one or several document(s) to all indexes
  */

lib/model.js

@@ -26,7 +26,7 @@ var dateToJSON = function () { return { $$date: this.getTime() }; }
  * But you really need to want it to trigger such behaviour, even when warned not to use '$' at the beginning of the field names...
  */
 function checkKey (k, v) {
-  if (k[0] === '$' && !(k === '$$date' && typeof v === 'number') && !(k === '$$deleted' && v === true) && !(k === '$$indexCreated')) {
+  if (k[0] === '$' && !(k === '$$date' && typeof v === 'number') && !(k === '$$deleted' && v === true) && !(k === '$$indexCreated') && !(k === '$$indexRemoved')) {
     throw 'Field names cannot begin with the $ character';
   }
 

test/db.test.js

@@ -2131,9 +2131,9 @@ describe('Database', function () {
                       db.indexes.planet.getAll().length.should.equal(3);
                       db.indexes.bloup.getAll().length.should.equal(0);
                       db.indexes.planet.unique.should.equal(true);
-                      db.indexes.planet.sparse.should.equal(false);                  
+                      db.indexes.planet.sparse.should.equal(false);
                       db.indexes.bloup.unique.should.equal(false);
-                      db.indexes.bloup.sparse.should.equal(true);                    
+                      db.indexes.bloup.sparse.should.equal(true);
                   
                       done();                
                     });

test/model.test.js

@@ -112,12 +112,13 @@ describe('Model', function () {
       c.test[2].again.should.equal('yes');
     });
 
-    it('Reject field names beginning with a $ sign or containing a dot, except the three edge cases', function () {
+    it('Reject field names beginning with a $ sign or containing a dot, except the four edge cases', function () {
       var a1 = { $something: 'totest' }
         , a2 = { "with.dot": 'totest' }
         , e1 = { $$date: 4321 }
         , e2 = { $$deleted: true }
         , e3 = { $$indexCreated: "indexName" }
+        , e4 = { $$indexRemoved: "indexName" }
         , b;
 
       // Normal cases
@@ -127,6 +128,8 @@ describe('Model', function () {
       // Edge cases
       b = model.serialize(e1);
       b = model.serialize(e2);
+      b = model.serialize(e3);
+      b = model.serialize(e4);
     });
     
     it('Can serialize string fields with a new line without breaking the DB', function (done) {