Acts as interval provides useful functions for models that have intervals in nature, models that have a start and end time, these methods are used to be able to query or test for other intervals that happened before, after, or overlap the instance you are testing

Add this line to your Gemfile

gem 'acts_as_interval', '~> 0.0'

To enable acts_as_interval, add it to your model and specify the start and end fields, for example a model that has start_at and end_at would look like this

acts_as_interval, start: :start_at, end: :end_at

Assuming we have a model that is called IntervalModel

To find intervals that happened in the past aka started and ended before the target instance started

# interval_model is a pre-selected instance of IntervalModel
interval_model.previous_interval_models

To find intervals that happened after the end of the target instance

# interval_model is a pre-selected instance of IntervalModel
interval_model.future_interval_models

To find other intervals that itersected or overlapped the target instance

# interval_model is a pre-selected instance of IntervalModel
interval_model.overlapping_inverval_models