ValidatesOverlap

This project rocks and uses MIT-LICENSE.

This gem is compatible with Rails 3 and 4.

When this gem should be helpful for you?

If you are developing Rails 3 app, let say some meeting planner and you can’t save records which have time overlap.

Using

Add to your gemfile

ruby gem 'validates_overlap'

In your model

without scope

ruby validates :starts_at, :ends_at, :overlap => true

with scope

ruby validates :starts_at, :ends_at, :overlap => {:scope => "user_id"}

exclude edges

ruby validates :starts_at, :ends_at, :overlap => {:exclude_edges => "starts_at"} validates :starts_at, :ends_at, :overlap => {:exclude_edges => ["starts_at", "ends_at"]}

define custom validation key and message

ruby validates :starts_at, :ends_at, :overlap => {:message_title => "Some validation title", :message_content => "Some validation message"}

with complicated relation relations

Example describes valildatation of user, positions and time slots. User can’t be assigned 2 times on position which is under time slot with time overlap.

ruby class Position < ActiveRecord::Base belongs_to :time_slot belongs_to :user validates "time_slots.starts_at", "time_slots.ends_at", :overlap => { :query_options => {:includes => :time_slot}, :scope => { "positions.user_id" => proc{|position| position.user_id} } } end