datajson

Datajson

Datajson is a data handler type bson that offers ODM environment giving all a simple and solid structure for processing.

Its structure is inspired by the Mongoose ODM. Using similar resources to handle and manipulate files type json

Init

  var datajson = require('datajson')({
    'path' : '/path/app/data',
    'modelPath' : '/path/app/model'
  });

  var model = datajson.model; // all model load

The setting options are Datajson:

• path : Path where the files will be saved, default: dirname
• indenting : If not required indentation for the writing of files, null, otherwise set to decimal values or '\t'. These data will be passed as the third parameter of JSON.stringify()
• ext : json file extension, default: .json
• modelPath : the model file path

Create a model

You can deploy directly from the file templates that are working. But for better organization suggest that write in a separate folder, with this example.

File: /model/profile.js

module.exports = function(Model){
  return new Model({
      name: 'profile',
      schema: {
          name: {
              required: true,
              type: String
          },
          description: String,
          active: {
              default: false,
              type: Boolean
          },
          categorie: {
              default: 'dev',
              type: String
          },
          birth: {
              required: true,
              type: Date
        },
        age: Number
    }
  })
}

From the model you can manipulate your bank as an MDG

Methods

These are the methods of model

• add : Inserts a new line.
• update : Updates values of one or more lines
• delete : Delete a specific line
• find : Search and returns values
• findOne : Search and returns the first value found
• findOne : Search and returns the first value found
• findById : Search for a specific id
• query : Defines a query
• date : Sets past values for a line
• drop : Completely removes a file
• save : Concludes the methods add, update and remove returns a registered entity and ready for use
• exec : Executes methods find's, return entity or object list
• then : Used to set a callback to treatment result of the action.

Query

Logical operators

And, Or and Not

Comparison

• $eq : Matches values that are equal to a specified value.
• $gt : Matches values that are greater than a specified value.
• $gte : Matches values that are greater than or equal to a specified value.
• $lt : Matches values that are less than a specified value.
• $lte : Matches values that are less than or equal to a specified value.
• $in : Matches any of the values specified in an array.
• $nin : Matches none of the values specified in an array.

Using queries

The query can be applied in the search methods, or by adding query method.

model.profile.find({"age" : { "$gt" : 18 } })

In this example we get the data from all major profiles 18 years of age. If we want to get over 18 or disabled the profile would be like this:

model.profile.find({
  "$or" : { "age" : { "$gt" : 18 }, "active" : false }
})

A more complex search:

Let's find users with the name Philippe or Martin, age less than or equal to 20 years and above 15 years. For this we will use the names regex

model.profile.find({
  "$or" : [
    {"name" : /philippe/gi},
    {"name" : /martin/gi}
  ],
  "$and" : [
    {"age" : { "$eq": 15 }},
    {"age" : { "$lte": 20 }}
  ]
})

Known bugs

Bug 1

In line 32 of /src/datajson.js you will find this:

      var model = require(path.resolve(modelPath, file))(Model).init(merge(true, defaultConfig, config))
})

But it should be like this:

      var model = require(path.resolve(modelPath, file))(Model).init(config)
})

It happens that when passing the value to the variable 'config' for some reason for me unknown variable is populated by several values which are the Model properties. The only solution I found was to pass again the merge function, so the config is not changed. Surely this is happening for some stupid of me. So if you know a solution, be sure to contribute