#506 fix: Deleting a file does not delete from fs.files (#1758)

* #506 fix: Deleting a file does not delete from fs.files

* test added to check that GridStoreAdapter deleteFile removes from fs.files and fs.chunks

spec/GridStoreAdapter.js

@@ -0,0 +1,87 @@
+var MongoClient = require("mongodb").MongoClient;
+var GridStore = require("mongodb").GridStore;
+
+var GridStoreAdapter = require("../src/Adapters/Files/GridStoreAdapter").GridStoreAdapter;
+var Config = require("../src/Config");
+var FilesController = require('../src/Controllers/FilesController').default;
+
+
+// Small additional tests to improve overall coverage
+describe("GridStoreAdapter",() =>{
+  it("should properly instanciate the GridStore when deleting a file", (done) => {
+
+    var databaseURI = 'mongodb://localhost:27017/parse';
+    var config = new Config(Parse.applicationId);
+    var gridStoreAdapter = new GridStoreAdapter(databaseURI);
+    var filesController = new FilesController(gridStoreAdapter);
+
+    // save original unlink before redefinition
+    var originalUnlink = GridStore.prototype.unlink;
+
+    var gridStoreMode;
+
+    // new unlink method that will capture the mode in which GridStore was opened
+    GridStore.prototype.unlink = function() {
+
+      // restore original unlink during first call
+      GridStore.prototype.unlink = originalUnlink;
+
+      gridStoreMode = this.mode;
+
+      return originalUnlink.call(this);
+    };
+
+
+    filesController.createFile(config, 'myFilename.txt', 'my file content', 'text/plain')
+      .then(myFile => {
+
+        return MongoClient.connect(databaseURI)
+          .then(database => {
+
+            // Verify the existance of the fs.files document
+            return database.collection('fs.files').count().then(count => {
+              expect(count).toEqual(1);
+              return database;
+            });
+          })
+          .then(database => {
+
+            // Verify the existance of the fs.files document
+            return database.collection('fs.chunks').count().then(count => {
+              expect(count).toEqual(1);
+              return database.close();
+            });
+          })
+          .then(() => {
+            return filesController.deleteFile(config, myFile.name);
+          });
+      })
+      .then(() => {
+        return         MongoClient.connect(databaseURI)
+          .then(database => {
+
+            // Verify the existance of the fs.files document
+            return database.collection('fs.files').count().then(count => {
+              expect(count).toEqual(0);
+              return database;
+            });
+          })
+          .then(database => {
+
+            // Verify the existance of the fs.files document
+            return database.collection('fs.chunks').count().then(count => {
+              expect(count).toEqual(0);
+              return database.close();
+            });
+          });
+      })
+      .then(() => {
+        // Verify that gridStore was opened in read only mode
+        expect(gridStoreMode).toEqual('r');
+
+        done();
+      })
+      .catch(fail);
+
+  })
+});

src/Adapters/Files/GridStoreAdapter.js

@@ -43,7 +43,7 @@ export class GridStoreAdapter extends FilesAdapter {
 
   deleteFile(filename: string) {
     return this._connect().then(database => {
-      let gridStore = new GridStore(database, filename, 'w');
+      let gridStore = new GridStore(database, filename, 'r');
       return gridStore.open();
     }).then((gridStore) => {
       return gridStore.unlink();