simple example getting error: Object #<Grex> has no method 'gremlin'

[leabdalla]

I'm trying the example in readme file:

var Grex = require('grex');

var settings = {
  'database': 'graph',
  'host': '127.0.0.1',
  'port': 8182
};

// 1. connect() takes two optional parameters: a settings Object and a Node style callback
Grex.connect(settings, function(err, client) {
  if (err) {
    console.error(err);
  }

  // 2. Initialize a Gremlin object to work with
  var gremlin = client.gremlin();

  // Start appending some code
  gremlin.g.v(1); // gremlin.script === 'g.v(1)'

  // 3. Send script for execution, and return a response with the results (if any)
  gremlin.exec(function(err, response) {
    // ...
  })
});

So, when I run app, I get this:

TypeError: Object #<Grex> has no method 'gremlin'

Am I doing something wrong?

[jbmusso]

Woops, this is indeed annoying.

Are you running the app in Node.js or in the browser? Also, which version of gRex are you using?

[leabdalla]

I'm running version 0.4.0 in NodeJS on Mavericks.

Outputting the client object, it shows:

{ options: { database: 'graph', host: '127.0.0.1', port: 8182 },
  typeMap: {},
  resultFormatter: {} }

[celrenheit]

The example you're trying is an example meant for the latest gRex version i.e., 0.5.x. I hugely recommend that you get the latest version. Run:

npm install grex

To get the latest version.

Otherwise, try the old example: https://github.com/gulthor/grex/blob/0.3.1/examples/createVertex.js

I just tried it with gRex 0.4.0 and there is a small bug in src/grex.js file installed inside your nodemodules directory: Change merge to .merge like so.

Grex.prototype.begin = function (typeMap) {
        typeMap = typeMap ? _.merge(typeMap, this.typeMap) : this.typeMap;

        return new Transaction(this.options, typeMap);
    };

Note: You also have to install the batch kibble extension... (https://github.com/gulthor/grex/tree/nodeify#dependancies).

The easiest thing you can do to get you started is installing the latest version of gRex.

[leabdalla]

Running

npm install grex

The version 0.4.0 is downloaded. Check: https://www.npmjs.org/package/grex

How can I manually install the version 0.5.0?

[jbmusso]

This is weird. It could be npm related, I don't know. I'll investigate.

Could you please try the following?

npm install grex@0.5.x

Or if you wish to automatically update package.json:

npm install grex@0.5.x --save

Let met know how it goes.

[leabdalla]

Now it worked and that errors has gone. Thanks!

npm install output:

 [~/Desktop/test]$ npm install grex@0.5.x --save                                                                                                                                                                                                             [ruby-1.9.3-p448]
 npm WARN package.json test@0.0.0 No description
 npm WARN package.json test@0.0.0 No repository field.
 npm WARN package.json test@0.0.0 No README data
 npm http GET https://registry.npmjs.org/grex
 npm http 304 https://registry.npmjs.org/grex
 npm http GET https://registry.npmjs.org/inherits
 npm http GET https://registry.npmjs.org/q
 npm http GET https://registry.npmjs.org/lodash
 npm http 304 https://registry.npmjs.org/inherits
 npm http 304 https://registry.npmjs.org/q
 npm http 304 https://registry.npmjs.org/lodash
 grex@0.5.6 node_modules/grex
 ├── inherits@2.0.1
 ├── q@0.9.7
 └── lodash@2.4.1
 [~/Desktop/test]$

[jbmusso]

Good to hear :). Let me know if you have trouble using gRex. You can also find me on irc Freenode #tinkerpop or #mogwai as Gulthor. Feel free to drop by, I'll happily provide support.

[jbmusso]

This issue is most likely related with issue https://github.com/gulthor/grex/issues/27.

[jbmusso]

This was indeed related to #27. My local npm config was misconfigured, and that caused issues when publishing packages. It was fixed for v0.5.6 and the problem should not occur with next versions anymore.