collagen-couchdb

CouchDB back-end storage for Collagen.js models.

npm install collagen-couchdb
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Collagen CouchDB

This module provides a CouchDB-based persistent storage for models in the Collagen.js framework.

Installation & Configuration

Install by running npm install collagen-couchdb in your Collagen.js app and add require('collagen-couchdb'); in your app's index.js file, anywhere before the model that needs it is loaded. For example:

var collagen = require('collagen');

require('collagen-couchdb'); // This module...
require('collagen-blog'); // Module that will use CouchDB

collagen.load(__dirname);
collagen.start();

You will need to add the CouchDB configuration details. In your collagen.json file, add the following property, replacing values as appropriate.

{
    "couchdb": {
        "host": "localhost",
        "port": 5984,
        "name": "collagen",
        "options": {
            "auth": {
                "username": "couchdb-username",
                "password": "couchdb-password"
            }
        }
    }
}

If you want to use the supplied CouchDB view for collections, you can install it by running the following command in your terminal: node index.js couchdb install. We also include the node index.js couchdb index command for convienence; it triggers indexing for the supplied view.

Usage

Once your module is installed and configured, you will need to add the storage: 'couchdb' property to the model or collection that will use it. For example:

model = models.Model.extend({
    storage: 'couchdb',
    /* My other model properties */
});

If you want to add it to a third-party model (i.e. from an installed module), it is good practice to not modify it and instead augment it in your own app. For the example above, you would create a new BlogPost.bones.js file in your app/model folder and add the following:

model = models.BlogPost.augment({
    storage: 'couchdb'
});

This way the BlogPost model from the collagen-blog module will be augmented to use CouchDB as the persistence storage, without having to modify the collagen-blog module. In addition to models, you would also want to add storage: 'couchdb' to any collections that need it.

The collagen-couchdb module overrides the model's sync() method and provides a model.couchDb() function that points to a CouchDB connection instance. You can use this to override the module's sync() method with your own logic.

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