Mongoose-Attachments is an attachments plugin for Mongoose.js. Supports Amazon S3 out-of-the-box and ImageMagick transformations styles.
$ npm install mongoose-attachments
The following example extens the 'Post' model to use attachments with a property called 'image' and three different styles.
var mongoose = require('mongoose');
var attachments = require('mongoose-attachments');
var PostSchema = new mongoose.Schema({
title: String,
description: String
});
PostSchema.plugin(attachments, {
directory: 'achievements',
storage: {
providerName: 's3',
options: {
key: '<key>',
secret: '<secret>',
bucket: '<bucket>'
}
},
properties: {
image: {
styles: {
original: {
// keep the original file
},
small: {
resize: '150x150'
},
medium: {
resize: '120x120'
},
medium_jpg: {
'$format': 'jpg' // this one changes the format of the image to jpg
}
}
}
}
});
var Post = mongoose.model('Post', PostSchema);
Assuming that the HTML form sent a file in a field called 'image':
app.post('/upload', function(req, res, next) {
var post = new mongoose.model('Post')();
post.title = req.body.title;
post.description = req.body.description;
post.attach('image', req.files.image, function(err) {
if(err) return next(err);
post.save(function(err) {
if(err) return next(err);
res.send('Post has been saved with file!');
});
})
});
var post = new mongoose.model('Post')();
post.title = 'Title of the Post';
post.description = 'Description of the Post';
post.attach('image', {
path: '/path/to/the/file.png'
}, function(err) {
if(err) return next(err);
post.save(function(err) {
if(err) return next(err);
console.log('Post has been Saved with file');
});
})
When mongoose-attachments is used with images, it can provide basic information for each one of the specified styles:
Example:
{
"dims" : {
"w" : 120,
"h" : 103
},
"depth" : 8,
"format" : "PNG",
"oname" : "dragon.png",
"mtime" : ISODate("2012-05-22T06:21:53Z"),
"ctime" : ISODate("2012-05-22T06:21:53Z"),
"size" : 26887,
"path" : "/achievements/4fbaaa31db8cec0923000019-medium.png",
"defaultUrl" : "http://gamygame-dev.s3.amazonaws.com/achievements/4fbaaa31db8cec0923000019-medium.png"
}
Transformations are achieved by invoking the convert command from ImageMagick and passing all the properties of the style as arguments.
For more information about convert, take a look at http://www.imagemagick.org/script/command-line-options.php
Example in convert command:
convert source.png -resize '50%' output.png
Example in plugin options:
styles: {
small: {
resize: '50%'
}
}
styles: {
original: {
// no transformations
}
}
Use another properties under the style to provide more transformations
styles: {
small: {
crop: '120x120',
blur: '5x10' //radius x stigma
}
}
More information about 'blur' at the [ImageMagick website] http://www.imagemagick.org/script/command-line-options.php#blur
You can change the destination format by using the special transformation '$format' with a known file extension like png, jpg, gif, etc.
Example:
styles: {
as_jpeg: {
'$format': 'jpg'
}
}
Note: DO NOT include the dot in the extension.
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