simple Rails gem to create custom autoincrement values to a database column
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README.md

Protokoll Travis Gem Version

Description

Protokoll is a simple Rails 4 pluggin to simplify the management of a custom autoincrement value for a model.

If you want to create an autoincrement information on the database, just like those callcenter registration number (2011000001, 2011000002, 20110000003 and on) this gem is for you! If you want to create just an custom autoincrement value, this gem is for you too! =)

All those tricky things to control like every month you have to reset the counter are gone! All you have to do is define a String column and let Protokoll handle the rest:

 # creating an autoincrement column based on Time
class Call < ActiveRecord::Base
    protokoll :registry_number  # by default it uses "%Y%m#####"
end

Time.local(2011)
call01 = Call.create
call01.registry_number
=> "201100001"

call02 = Call.create
call02.registry_number
=> "201100002"

Time.local(2012)

call03 = Call.create
call03.registry_number
=> "201200001"  # restarts counter because it is the first item of the year

If you want to use your own pattern, just do this:

class Call < ActiveRecord::Base
    protokoll :registry_number, :pattern => "some#####thing"
end

# this will produce
call01 = Call.create
call01.registry_number
=> "some00001thing"

call02 = Call.create
call02.registry_number
=> "some00002thing"

Or use any time based format. You can use in the pattern any combination of:

# assume it's 2011/01/01 12:00
"%Y" for year   	# => appends 2011
"%y" for year   	# => appends 11
"%m" for month  	# => appends 01
"%d" for day	 	# => appends 01
"%H" for hour	 	# => appends 12
"%M" for minute 	# => appends 00
"#"  for the autoincrement number (use as long as you want)

Using the Time formating string ("%y", "%m", ...) is totally optional. It's fine to use "CALL####", "BUY###N" or any combination you like.

Ex:

# :number must be a String
class Car < ActiveRecord::Base
    protokoll :number, :pattern => "CAR%y#####"
end

# will produce => "CAR1100001", "CAR1100002"...

# :sell_number must be a String
class House < ActiveRecord::Base
    protokoll :sell_number, :pattern => "%YHOUSE#####"
end

# will produce => "2011HOUSE00001", "2011HOUSE00002"...

It's possible to pass :scope_by option as a simple method, Proc.new or lambda

Ex:

# :manufacturer should be a Car's instance method(like an ActiveRecord column)
class Car < ActiveRecord::Base
    protokoll :code, :scope_by => :manufacturer
end
# will scope Cars by manufacturers, for example "Ford", "Chevrolet"

# :manufacturer and :year should be Car's instance methods(like ActiveRecord columns)
class Car < ActiveRecord::Base
    protokoll :code, :scope_by => lambda { |o| "#{o.manufacturer}-#{o.year}" }
end
# will scope Cars by for example "Ford-2016"

# :manufacturer and :year should be Car's instance methods(like ActiveRecord columns)
class Car < ActiveRecord::Base
    protokoll :code, :scope_by => Proc.new{ "#{manufacturer}-#{model}" }
end
# will scope Cars by for example "Ford-Mustang", "Chevrolet-Camaro"

reserve_number!

object.reserve_number!

Add a new intance method colled: "your_instance#reserve_#{column_name}!". With it you can reserve a number without the need to save it to the database. Ex:

 car = Car.new
 car.number
 # => nil
 car.reserve_number!
 car.number
 # => "CAR1100001"
 # if you save it, the object will preserve the number: "CAR1100001"

It just increases the counter so any other object that gets saved or uses the #reserve_#{column_name} will get the next available number.

Installation

Just add to the Gemfile:

gem 'protokoll'

And run bundle install on the Rails application folder

bundle install

Run the generator

rails g protokoll:migration

Optional: If scope_by will be used run next generator as well

rails g protokoll:migration:scope_by

and migrate your database

rake db:migrate

Questions & Sugestions

This is my first public gem, so if you have any questions os sugestions, feel free to contact me (use github msg system for that). It will be awesome to hear feedback to improve the code.

The gem is still on early alpha so you may find bugs on it. And if you do, please use the Issues here in Github and I'd love to fix it.

This piece of software is free to use.

Check the wiki if you are having any issues while upgrading from version 0.x

Running tests in Development

You need to clone the project

git clone git@github.com:celsodantas/protokoll.git
cd protokoll

Then prepare the test database:

bundle
cd test/dummy && rake db:migrate && rake db:test:prepare && cd ../..

Now run the rake test to run the tests:

rake test