According to mongoose.js doc, it is able to set setters to a field on schema.
However, the doc is not quite detailed and obselete.
Some example:

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var schema=new Schema({
  password:{
    type:String,
    required:true,
    set:hash
  }
})
function hash(plainPwd){
  return require("crypto").createHash("sha1").update(plainPwd).update(secret).digest("hex");
}

The hash will be called mainly on following scenarios:

• When a new doc being created.

  1	model.create({password:"12345"}) //password will be hashed

• When set a value to a doc.

  1	doc.password="22222" // 22222 will be hashed

However, this will not work for update query:

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model.update({_id:<id>},{$set:{password:"12345"}}) // password will not be hashed
model.findOneAndUpdate
model.findAndUpdate

For password, it is able to write beforeUpdateHook

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schema.methods.beforeUpdateHook=function(data){
  if (!data || this.password === data.password){
    return ;
  }
  if (data.password){
    data.password=hash(data.password);
  }
}

Mongodb needs extra collection for two phase lock.

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var transactionSchema=new Schema({
  lastModified:Date,
  status:{
    type:String,
    default:"new",
    index:true
  },
  data:{}
})

The transaction life cycle is new->pending->applied->done

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When put wordpress blog behind a reverse proxy (e.g. nginx), some headers have to be setup:

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proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header HTTP_X_FORWARDED_PROTO $scheme;

minimist is a lightweight cli argument (command line arguments) parser:

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require('minimist')("-x 3 -y 4 -n5 -abc --beep=boop foo bar baz");
//output:
{ _: [ 'foo', 'bar', 'baz' ],
  x: 3,
  y: 4,
  n: 5,
  a: true,
  b: true,
  c: true,
  beep: 'boop' }

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-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale

Makes text clearer

What is Docker and why?

See here

In short:

• Docker is a container tech based on LXC
• Much less resource than VM by sharing cores
• But provide full run-time isolation
• It makes system deployment much faster
• and easier system operation

Still don’t know why? Check out use cases here

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Resize

Switch on / off resize of a textarea on horizontal / vertical / both.

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<textarea style="resize:horizontal"></textarea>

The resize property can be either:

• vertical: only resize vertically
• horizontal: only resize horizontally
• none: disable resize (also remove the resize area on right bottom.)

Outline

Remove or change style of outline when textarea is focused on safari / chrome etc.

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<textarea class="customize"></textarea>

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.customize:focus{
  outline-color:red;
}

Today, I moved my blog from Wordpress to Hexo. I use github.io to host the blog.

The reason I choose Hexo not Jekyll mainly is I am more familiar with Node.js than Ruby so I can write plugins easily.

Hexo is a very powerful static content generator which converts MarkDown posts to Html.

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Demo: Click here

Document & API: See Github site for more information.