Ika

Ika implements the function that export/import ActiveModel data with json. Ika also supports carrierwave.

Installation

In Rails, add it to your Gemfile:

gem 'ika'

Usage

You can use export or import method on your model or relation.

Example

In case: Group has many tags and User belongs to multiple groups with GroupUsers such as below.

class User < ActiveRecord::Base
  has_many :group_users
  has_many :groups, through: :group_users
end

class GroupUsers < ActiveRecord::Base
  belongs_to :user
  belongs_to :group
end

class Group < ActiveRecord::Base
  has_many :group_users
  has_many :users, through: :group_users
  has_many :tags
end

class Tag < ActiveRecord::Base
  belongs_to :group
end

Now you can export with export method on your model or relation and import with import method on your model.

require 'json'
# with no options

JSON.parse User.export
# => [{"id":1,"name":"iruca3"},{"id":2,"name":"inkling"}]
JSON.parse User.where(id: 1).export
# => [{"id":1,"name":"iruca3"}]
JSON.parse User.find(id: 2).export
# => {"id":2,"name":"inkling"}

# with include option
JSON.parse User.export(include: :groups)
# => [{"id":1,"name":"iruca3","groups":[{"id":1,"name":"aqutras"},{"id":2,"name":"Splatoon"}]},{"id":2,"name":"inkling","groups":[{"id":2,"name":"Splatoon"}]}]
data = JSON.parse(User.find(id: 1).export(include: [{groups: [:tags]}]))
# => {"id":1,"name":"iruca3","groups":[{"id":1,"name":"aqutras","tags":[{"id":1,"name":"Company"}]},{"id":2,"name":"Splatoon","tags":[{"id":2,"name":"Game"},{"id":3,"name":"Inkling"}]}]}

# import (id, created_at and updated_at are completely imported with the same value)
User.destroy_all
Group.destroy_all
Tag.destroy_all
User.import(data)

# sync mode is available.
User.import(User.where(id: 1).export, sync: true)
User.exist?(id: 2)
# => false

Sync mode

Sync mode performs that ika deletes all data of importing models. For example, if exporting data includes that id is 1 and 2, and there are already exists data that id is 1, 2 and 3, sync importing deletes the data of id 3.

Others

• DO NOT USE sync mode if you are using include option.
• If the same id exists, Ika uses UPDATE.
• Uploaded files by carrierwave will be checked their md5 hash and do nothing if they exist and md5 is matched.
• If there already exists import or export methods, you can use ika_import or ika_export methods.

Contributing

Test

You need to run bundle exec rake db:create db:migrate on spec/dummy before testing.

License

Copyright (c) 2015-2016 Aqutras This project rocks and uses MIT-LICENSE.