CODEWITHSUNDEEP
self-joinbatman.js
Raymundus
Raymundus

Reputation: 2462

Self joins in Batmanjs

How can I implement the self-joins in Batmanjs?

In rails, as found here, it goes like this:

class Employee < ActiveRecord::Base
  has_many :subordinates, class_name: "Employee", foreign_key: "manager_id"
  belongs_to :manager, class_name: "Employee"
end

My current Batmanjs equivalent model looks like this:

class Employee extends Batman.Model
  @resourceName: 'employees'
  @storageKey: 'employees'

  @persist Batman.LocalStorage

  @has_many 'subordinates', name: "Employees", foreignKey: "manager_id"
  @belongs_to 'manager', name: "Employee"

Upvotes: 0

Views: 76

Answers (1)

rmosolgo
rmosolgo

Reputation: 1874

I think that should work, if you just switch:

  • has_many/belongs_to => hasMany/belongsTo
  • name: "Employees" => name: "Employee".

Also, you may have to add an encoder for id with the LocalStorage adapter. LocalStorage converts the value to a string, but batman.js expects an integer, so you have to coerce it back to integer in the encoder.

Here's an example of self-joins (you can copy-paste the encoder from there, too):

http://jsbin.com/cukapedo/18/edit

Pasted here for posterity:

class App.Color extends Batman.Model 
  @resourceName: 'color'
  @persist Batman.LocalStorage
  @encode 'name', 'source_color_id'
  # required for numbers in localStorage:
  @encode 'id', 
    encode: (val) -> +val
    decode: (val) -> +val

  @hasMany 'child_colors', name: 'Color', foreignKey: 'source_color_id'
  @belongsTo 'source_color', name: 'Color'

Upvotes: 1

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