How I built a rails interface on top of the amazing IceCube ruby gem. Video of final product: http://youtu.be/F6t-USuWPag

_form.html.haml

= bootstrap_form_for @event, html: {class: 'form-horizontal', novalidate: 'novalidate'} do |f|
  .row
    .span6
      = f.text_field :name, class: 'span4'
      = f.text_area :description, class: 'span4', rows: 5
      = f.select :location_id, options_from_collection_for_select(Place.all, 'id', 'name', f.object.location_id), include_blank: true
      = f.select :host_id, options_from_collection_for_select(Place.all, 'id', 'name', f.object.host_id), include_blank: true
    .span6
      = f.check_box :is_all_day
      = f.date_select :from_date, {}, {style: 'width:auto;'}
      .event_time
        = f.time_select :from_time, {:minute_step => 15}, {style: 'width:auto;'}
      = f.date_select :to_date, {}, {style: 'width:auto;'}
      .event_time
        = f.time_select :to_time, {:minute_step => 15}, {style: 'width:auto;'}
      .event_time
        = f.time_zone_select :time_zone, ActiveSupport::TimeZone.us_zones, :default => "Central Time (US & Canada)"
      = f.select :repeats, Event::RepeatsOptions
      = render partial: 'repeats_daily_options', locals: {f: f}
      = render partial: 'repeats_weekly_options', locals: {f: f}
      = render partial: 'repeats_monthly_options', locals: {f: f}
      = render partial: 'repeats_yearly_options', locals: {f: f}
      #repeats_options.event_option
        = f.select :repeat_ends, Event::RepeatEndsOptions
        #event_repeat_ends_on
          = f.date_select :repeat_ends_on, {}, {style: 'width:auto;'}

  .form-actions
    = f.submit 'Save'

- content_for :last_javascripts do
  :javascript
    $(function() {
      var toggle_repeats_yearly_on = function(){
        if($('#event_repeats_yearly_on').is(':checked')){
          $('#event_repeats_yearly_on_options').show();
        } else {
          $('#event_repeats_yearly_on_options').hide();
        }
      }
      toggle_repeats_yearly_on();
      $('#event_repeats_yearly_on').on('change',function(){
        toggle_repeats_yearly_on();
      });
      var toggle_event_times = function(){
        if($('#event_is_all_day').is(':checked')){
          $('.event_time').hide();
        } else {
          $('.event_time').show();
        }
      }
      toggle_event_times();
      $('#event_is_all_day').on('change',function(){
        toggle_event_times();
      });
      var toggle_event_options = function(){
        $('.event_option').hide();
        switch ($('#event_repeats').val())
        {
        case 'never':
          // Nothing
          break;
        case 'daily':
          $('#repeats_options').show();
          $('#repeats_daily_options').show();
          break;
        case 'weekly':
          $('#repeats_options').show();
          $('#repeats_weekly_options').show();
          break;
        case 'monthly':
          $('#repeats_options').show();
          $('#repeats_monthly_options').show();
          break;
        case 'yearly':
          $('#repeats_options').show();
          $('#repeats_yearly_options').show();
          break;
        }
      }
      toggle_event_options();
      $('#event_repeats').on('change',function(){
        toggle_event_options();
      });
      var toggle_repeat_ends_on = function(){
        switch ($('#event_repeat_ends').val())
        {
        case 'never':
          $('#event_repeat_ends_on').hide();
          break;
        case 'on':
          $('#event_repeat_ends_on').show();
          break;
        }
      }
      toggle_repeat_ends_on();
      $('#event_repeat_ends').on('change',function(){
        toggle_repeat_ends_on();
      });
      var toggle_repeats_monthly = function(){
        switch ($('#event_repeats_monthly').val())
        {
        case 'each':
          $('#event_repeats_monthly_each').show();
          $('#event_repeats_monthly_on').hide();
          break;
        case 'on':
          $('#event_repeats_monthly_each').hide();
          $('#event_repeats_monthly_on').show();
          break;
        }
      }
      toggle_repeats_monthly();
      $('#event_repeats_monthly').on('change',function(){
        toggle_repeats_monthly();
      });
    });

- content_for :first_styles do
  :css
    #repeats_options {display:none;}
    #repeats_daily_options {display:none;}
    #repeats_weekly_options {display:none;}
    #repeats_monthly_options {display:none;}
    #repeats_yearly_options {display:none;}

_repeats_daily_options.html.haml

%fieldset{id: 'repeats_daily_options', class: 'event_option'}
  = f.number_field :repeats_every_n_days

_repeats_monthly_options.html.haml

%fieldset{ id: 'repeats_monthly_options', class: 'event_option'}
  = f.number_field :repeats_every_n_months
  = f.select :repeats_monthly, Event::RepeatMonthlyOptions
  #event_repeats_monthly_each.control-group
    %label.control-label Each
    .controls
      - Event::DaysOfTheMonth.each do |day_of_the_month|
        = label_tag "event_repeats_monthly_each_days_of_the_month_#{day_of_the_month}", day_of_the_month, :class => 'checkbox inline' do
          = check_box_tag "event[repeats_monthly_each_days_of_the_month][#{day_of_the_month}]", day_of_the_month, f.object.repeats_monthly_each_days_of_the_month.include?(day_of_the_month), {:name => "event[repeats_monthly_each_days_of_the_month][]"}
          = day_of_the_month
      = hidden_field_tag "event[repeats_monthly_each_days_of_the_month][]", ""
  #event_repeats_monthly_on.control-group
    %label.control-label On the
    .controls
      - Event::Ordinals.each_with_index do |ordinal,index|
        = label_tag "event_repeats_monthly_on_ordinals_#{ordinal}", ordinal, :class => 'checkbox inline' do
          = check_box_tag "event[repeats_monthly_on_ordinals][#{ordinal}]", ordinal, f.object.repeats_monthly_on_ordinals.include?(ordinal), {:name => "event[repeats_monthly_on_ordinals][]"}
          = Event::HumanOrdinals[index]
      = hidden_field_tag "event[repeats_monthly_on_ordinals][]", ""
      %hr
      - Event::DaysOfTheWeek.each do |day_of_the_week|
        = label_tag "event_repeats_monthly_on_days_of_the_week_#{day_of_the_week}", day_of_the_week.humanize, :class => 'checkbox inline' do
          = check_box_tag "event[repeats_monthly_on_days_of_the_week][#{day_of_the_week}]", day_of_the_week, f.object.repeats_monthly_on_days_of_the_week.include?(day_of_the_week), {:name => "event[repeats_monthly_on_days_of_the_week][]"}
          = day_of_the_week.humanize
      = hidden_field_tag "event[repeats_monthly_on_days_of_the_week][]", ""

_repeats_weekly_options.html.haml

%fieldset{ id: 'repeats_weekly_options', class: 'event_option'}
  = f.number_field :repeats_every_n_weeks
  .control-group
    %label.control-label Each
    .controls
      - Event::DaysOfTheWeek.each do |day_of_the_week|
        = label_tag "event_repeats_weekly_each_days_of_the_week_#{day_of_the_week}", day_of_the_week.humanize, :class => 'checkbox inline' do
          = check_box_tag "event[repeats_weekly_each_days_of_the_week][#{day_of_the_week}]", day_of_the_week, f.object.repeats_weekly_each_days_of_the_week.include?(day_of_the_week), {:name => "event[repeats_weekly_each_days_of_the_week][]"}
          = day_of_the_week.humanize
      = hidden_field_tag "event[repeats_weekly_each_days_of_the_week][]", ""

_repeats_yearly_options.html.haml

%fieldset{ id: 'repeats_yearly_options', class: 'event_option'}
  = f.number_field :repeats_every_n_years
  .control-group
    %label.control-label Each
    .controls
      - Event::MonthsOfTheYear.each do |month_of_the_year|
        = label_tag "event_repeats_yearly_each_months_of_the_year_#{month_of_the_year}", month_of_the_year.humanize, :class => 'checkbox inline' do
          = check_box_tag "event[repeats_yearly_each_months_of_the_year][#{month_of_the_year}]", month_of_the_year, f.object.repeats_yearly_each_months_of_the_year.include?(month_of_the_year), {:name => "event[repeats_yearly_each_months_of_the_year][]"}
          = month_of_the_year.humanize
      = hidden_field_tag "event[repeats_yearly_each_months_of_the_year][]", ""
  = f.check_box :repeats_yearly_on
  #event_repeats_yearly_on_options.control-group
    %label.control-label On the
    .controls
      - Event::Ordinals.each_with_index do |ordinal,index|
        = label_tag "event_repeats_yearly_on_ordinals_#{ordinal}", ordinal, :class => 'checkbox inline' do
          = check_box_tag "event[repeats_yearly_on_ordinals][#{ordinal}]", ordinal, f.object.repeats_yearly_on_ordinals.include?(ordinal), {:name => "event[repeats_yearly_on_ordinals][]"}
          = Event::HumanOrdinals[index]
      = hidden_field_tag "event[repeats_yearly_on_ordinals][]", ""
      %hr
      - Event::DaysOfTheWeek.each do |day_of_the_week|
        = label_tag "event_repeats_yearly_on_days_of_the_week_#{day_of_the_week}", day_of_the_week.humanize, :class => 'checkbox inline' do
          = check_box_tag "event[repeats_yearly_on_days_of_the_week][#{day_of_the_week}]", day_of_the_week, f.object.repeats_yearly_on_days_of_the_week.include?(day_of_the_week), {:name => "event[repeats_yearly_on_days_of_the_week][]"}
          = day_of_the_week.humanize
      = hidden_field_tag "event[repeats_yearly_on_days_of_the_week][]", ""

calendar.html.haml

#calendar{:style => 'margin:1em 0;'}
    
- content_for :last_javascripts do
  :javascript
      $('#calendar').fullCalendar({
        eventSources: [
          // your event source
          {
              url: '/event_instances.json',
              data: {
                  custom_param1: 'something',
                  custom_param2: 'somethingelse'
              },
              error: function() {
                  alert('there was an error while fetching events!');
              }
          }
          // any other sources...
        ]
      });

event.rb

class Event < ActiveRecord::Base
  include IceCubeMethods
  
  # My custom attributes. Modify to suite your needs.
  # attr_accessible :description, :name, :host_id, :location_id
  
  # validates :name, :presence => true
  # validates :host_id, :presence => true
  # validates :location_id, :presence => true
  
  # belongs_to :host, :class_name => 'Place'
  # belongs_to :location, :class_name => 'Place'

end

event_instance.rb

class EventInstance
  include ActiveModel::AttributeMethods
  
  attr_accessor :title, :start, :end, :allDay, :event_id
  
  def self.occurrences_between(begin_date,end_date)
    # Using Squeel
    # line 1 = Event doesn't repeat, but ends in window
    # line 2 = Event doesn't repeat, but starts in window
    # line 2 = Event doesn't repeat, but starts before and ends after
    # line 4 = Event starts before our end date and repeats until a certain point of time, and that point of time after our begin date
    # line 5 = Event repeats indefinitely, then all we care about is that it has started at somepoint in the last
    results = Event.where{
      ( 
        (repeats == 'never') & 
        (from_date >= begin_date) & 
        (from_date <= end_date)
      ) | ( 
        (repeats == 'never') & 
        (to_date >= begin_date) & 
        (to_date <= end_date)
      ) | ( 
        (repeats == 'never') & 
        (from_date <= begin_date) & 
        (to_date >= end_date)
      ) | ( 
        (repeats != 'never') & 
        (from_date <= end_date) & 
        (repeat_ends == 'on') & 
        (repeat_ends_on >= begin_date)
      ) | ( 
        (repeats != 'never') & 
        (repeat_ends == 'never') & 
        (from_date <= end_date)
      )  
    }
    results.map { |event| 
      event.schedule.occurrences_between(begin_date,end_date).map { |date|
        i = EventInstance.new()
        i.title = event.name
        i.start = date
        i.end = date + event.duration
        i.allDay = event.is_all_day
        i.event_id = event.id
        i
      }
    }.flatten.sort! {|x,y| x.start <=> y.start }
  end
  
end

event_instances_controller.rb

class EventInstancesController < ApplicationController
  # GET /events
  # GET /events.json
  def index
    @event_instances = EventInstance.occurrences_between(Date.parse('2013-01-01'),Date.parse('2013-04-30'))

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @event_instances }
    end
  end

end

Gemfile

# Add these two gems
gem 'ice_cube',                     '0.9.3'
gem 'squeel',                       '1.0.16'

ice_cube_methods.rb

module IceCubeMethods
  def self.included(base)
    base.send :attr_accessible, :from_date
    base.send :attr_accessible, :from_time
    base.send :attr_accessible, :to_date
    base.send :attr_accessible, :to_time
    base.send :attr_accessible, :is_all_day
    base.send :attr_accessible, :repeat_ends
    base.send :attr_accessible, :repeat_ends_on
    base.send :attr_accessible, :repeats
    base.send :attr_accessible, :repeats_every_n_days
    base.send :attr_accessible, :repeats_every_n_weeks
    base.send :attr_accessible, :repeats_weekly_each_days_of_the_week
    base.send :attr_accessible, :repeats_every_n_months
    base.send :attr_accessible, :repeats_monthly
    base.send :attr_accessible, :repeats_monthly_each_days_of_the_month
    base.send :attr_accessible, :repeats_monthly_on_days_of_the_week
    base.send :attr_accessible, :repeats_monthly_on_ordinals
    base.send :attr_accessible, :repeats_every_n_years
    base.send :attr_accessible, :repeats_yearly_each_months_of_the_year
    base.send :attr_accessible, :repeats_yearly_on
    base.send :attr_accessible, :repeats_yearly_on_days_of_the_week
    base.send :attr_accessible, :repeats_yearly_on_ordinals
    base.send :attr_accessible, :time_zone
    base.send :validates, :repeats, :presence => true
    base.send :validates, :repeats_every_n_days, :presence => true, :if => lambda { |e| e.repeats == "daily" }
    base.send :validates, :repeats_every_n_weeks, :presence => true, :if => lambda { |e| e.repeats == "weekly" }
    base.send :validate, :must_have_at_least_one_repeats_weekly_each_days_of_the_week, :if => lambda { |e| e.repeats == "weekly" }
    base.send :validates, :repeats_every_n_months, :presence => true, :if => lambda { |e| e.repeats == "monthly" }
    base.send :validates, :repeats_monthly, :presence => true, :if => lambda { |e| e.repeats == "monthly" }
    base.send :validate, :must_have_at_least_one_repeats_monthly_each_days_of_the_month, :if => lambda { |e| e.repeats == "monthly" && e.repeats_monthly == 'each' }
    base.send :validate, :must_have_at_least_one_repeats_monthly_on_ordinals, :if => lambda { |e| e.repeats == "monthly" && e.repeats_monthly == 'on' }
    base.send :validate, :must_have_at_least_one_repeats_monthly_on_days_of_the_week, :if => lambda { |e| e.repeats == "monthly" && e.repeats_monthly == 'on' }
    base.send :validates, :repeats_every_n_years, :presence => true, :if => lambda { |e| e.repeats == "yearly" }
    base.send :validate, :must_have_at_least_one_repeats_yearly_each_months_of_the_year, :if => lambda { |e| e.repeats == "yearly" }
    base.send :validate, :must_have_at_least_one_repeats_yearly_on_ordinals, :if => lambda { |e| e.repeats == "yearly" && e.repeats_yearly_on }
    base.send :validate, :must_have_at_least_one_repeats_yearly_on_days_of_the_week, :if => lambda { |e| e.repeats == "yearly" && e.repeats_yearly_on }
    base.send :validate, :from_must_come_before_to
  end
  
  RepeatsOptions = ['never','daily','weekly','monthly','yearly']
  RepeatEndsOptions = ['never','on']
  RepeatMonthlyOptions = ['each','on']
  DaysOfTheWeek = %w[sunday monday tuesday wednesday thursday friday saturday]
  DaysOfTheMonth = (1..31).to_a
  Ordinals = [1,2,3,4,-1]
  HumanOrdinals = ['first','second','third','fourth','last']
  MonthsOfTheYear = %w[january february march april may june july august september october november december]
  
  def repeats_weekly_each_days_of_the_week=(repeats_weekly_each_days_of_the_week)
    self.repeats_weekly_each_days_of_the_week_mask = (repeats_weekly_each_days_of_the_week & DaysOfTheWeek).map { |r| 2**DaysOfTheWeek.index(r) }.inject(0, :+)
  end
  def repeats_weekly_each_days_of_the_week
    DaysOfTheWeek.reject do |r|
      ((repeats_weekly_each_days_of_the_week_mask || 0) & 2**DaysOfTheWeek.index(r)).zero?
    end
  end
  
  def repeats_monthly_each_days_of_the_month=(repeats_monthly_each_days_of_the_month)
    repeats_monthly_each_days_of_the_month.map!{|d| d.to_i} # They come in as strings, but our array is full of integers
    self.repeats_monthly_each_days_of_the_month_mask = (repeats_monthly_each_days_of_the_month & DaysOfTheMonth).map { |r| 2**DaysOfTheMonth.index(r) }.inject(0, :+)
  end
  def repeats_monthly_each_days_of_the_month
    DaysOfTheMonth.reject do |r|
      ((repeats_monthly_each_days_of_the_month_mask || 0) & 2**DaysOfTheMonth.index(r)).zero?
    end
  end
  
  def repeats_monthly_on_ordinals=(repeats_monthly_on_ordinals)
    repeats_monthly_on_ordinals.map!{|o| o.to_i} # They come in as strings, but our array is full of integers
    self.repeats_monthly_on_ordinals_mask = (repeats_monthly_on_ordinals & Ordinals).map { |r| 2**Ordinals.index(r) }.inject(0, :+)
  end
  def repeats_monthly_on_ordinals
    Ordinals.reject do |r|
      ((repeats_monthly_on_ordinals_mask || 0) & 2**Ordinals.index(r)).zero?
    end
  end
  
  def repeats_monthly_on_days_of_the_week=(repeats_monthly_on_days_of_the_week)
    self.repeats_monthly_on_days_of_the_week_mask = (repeats_monthly_on_days_of_the_week & DaysOfTheWeek).map { |r| 2**DaysOfTheWeek.index(r) }.inject(0, :+)
  end
  def repeats_monthly_on_days_of_the_week
    DaysOfTheWeek.reject do |r|
      ((repeats_monthly_on_days_of_the_week_mask || 0) & 2**DaysOfTheWeek.index(r)).zero?
    end
  end
  
  def repeats_yearly_each_months_of_the_year=(repeats_yearly_each_months_of_the_year)
    self.repeats_yearly_each_months_of_the_year_mask = (repeats_yearly_each_months_of_the_year & MonthsOfTheYear).map { |r| 2**MonthsOfTheYear.index(r) }.inject(0, :+)
  end
  def repeats_yearly_each_months_of_the_year
    MonthsOfTheYear.reject do |r|
      ((repeats_yearly_each_months_of_the_year_mask || 0) & 2**MonthsOfTheYear.index(r)).zero?
    end
  end
    
  def repeats_yearly_on_ordinals=(repeats_yearly_on_ordinals)
    repeats_yearly_on_ordinals.map!{|o| o.to_i} # They come in as strings, but our array is full of integers
    self.repeats_yearly_on_ordinals_mask = (repeats_yearly_on_ordinals & Ordinals).map { |r| 2**Ordinals.index(r) }.inject(0, :+)
  end
  def repeats_yearly_on_ordinals
    Ordinals.reject do |r|
      ((repeats_yearly_on_ordinals_mask || 0) & 2**Ordinals.index(r)).zero?
    end
  end
  
  def repeats_yearly_on_days_of_the_week=(repeats_yearly_on_days_of_the_week)
    self.repeats_yearly_on_days_of_the_week_mask = (repeats_yearly_on_days_of_the_week & DaysOfTheWeek).map { |r| 2**DaysOfTheWeek.index(r) }.inject(0, :+)
  end
  def repeats_yearly_on_days_of_the_week
    DaysOfTheWeek.reject do |r|
      ((repeats_yearly_on_days_of_the_week_mask || 0) & 2**DaysOfTheWeek.index(r)).zero?
    end
  end
  
  def from
    if is_all_day
      ActiveSupport::TimeZone[time_zone].parse(from_date.to_datetime.strftime('%Y-%m-%d')).beginning_of_day
    else
      ActiveSupport::TimeZone[time_zone].parse(from_date.to_datetime.strftime('%Y-%m-%d')).beginning_of_day + from_time.seconds_since_midnight
    end
  end
  
  def to
    if is_all_day
      ActiveSupport::TimeZone[time_zone].parse(to_date.to_datetime.strftime('%Y-%m-%d')).end_of_day
    else
      ActiveSupport::TimeZone[time_zone].parse(to_date.to_datetime.strftime('%Y-%m-%d')).beginning_of_day + to_time.seconds_since_midnight
    end
  end
  
  def duration
    d = to - from - 1
  end
  
  def schedule(starts_at = nil, ends_at = nil)
    starts_at ||= from
    ends_at ||= to
    s = IceCube::Schedule.new(starts_at, :ends_time => ends_at)
    case repeats
    when 'never'
      s.add_recurrence_time(starts_at)
    when 'daily'
      s.add_recurrence_rule IceCube::Rule.daily(repeats_every_n_days)
    when 'weekly'
      days = repeats_weekly_each_days_of_the_week.map {|d| d.to_sym }
      s.add_recurrence_rule IceCube::Rule.weekly(repeats_every_n_weeks).day(*days)
    when 'monthly'
      case repeats_monthly
      when 'each'
        s.add_recurrence_rule IceCube::Rule.monthly(repeats_every_n_months).day_of_month(*repeats_monthly_each_days_of_the_month)
      when 'on'
        h = {}
        repeats_monthly_on_days_of_the_week.each do |day_of_the_week|
          h[day_of_the_week.to_sym] = repeats_monthly_on_ordinals
        end
        s.add_recurrence_rule IceCube::Rule.monthly(repeats_every_n_months).day_of_week(h)
      end
    when 'yearly'
      if repeats_yearly_on
        h = {}
        repeats_yearly_on_days_of_the_week.each do |day_of_the_week|
          h[day_of_the_week.to_sym] = repeats_yearly_on_ordinals
        end
        months = repeats_yearly_each_months_of_the_year.map {|m| m.to_sym }
        s.add_recurrence_rule IceCube::Rule.yearly(repeats_every_n_years).month_of_year(*months).day_of_week(h)
      else
        months = repeats_yearly_each_months_of_the_year.map {|m| m.to_sym }
        s.add_recurrence_rule IceCube::Rule.yearly(repeats_every_n_years).month_of_year(*months)
      end
    end
    return s
  end
  
private
  def must_have_at_least_one_repeats_weekly_each_days_of_the_week
    if repeats_weekly_each_days_of_the_week.empty?
      errors.add(:base, "You must have at least one repeats weekly each days of the week")
    end
  end
  
  def must_have_at_least_one_repeats_monthly_each_days_of_the_month
    if repeats_monthly_each_days_of_the_month.empty?
      errors.add(:base, "You must have at least one repeats monthly each days of the month")
    end
  end
  
  def must_have_at_least_one_repeats_monthly_on_ordinals
    if repeats_monthly_on_ordinals.empty?
      errors.add(:base, "You must have at least one repeats monthly on ordinals")
    end
  end
  
  def must_have_at_least_one_repeats_monthly_on_days_of_the_week
    if repeats_monthly_on_days_of_the_week.empty?
      errors.add(:base, "You must have at least one repeats monthly on days of the week")
    end
  end
  
  def must_have_at_least_one_repeats_yearly_each_months_of_the_year
    if repeats_yearly_each_months_of_the_year.empty?
      errors.add(:base, "You must have at least one repeats yearly each months of the year")
    end
  end
  
  def must_have_at_least_one_repeats_yearly_on_ordinals
    if repeats_yearly_on_ordinals.empty?
      errors.add(:base, "You must have at least one repeats yearly on ordinals")
    end
  end
  
  def must_have_at_least_one_repeats_yearly_on_days_of_the_week
    if repeats_yearly_on_days_of_the_week.empty?
      errors.add(:base, "You must have at least one repeats yearly on days of the week")
    end
  end
  
  def from_must_come_before_to
    if from > to
      errors.add(:to_date, "must come after the from date")
    end
  end
  
end

migration.rb

class CreateEvents < ActiveRecord::Migration
  def change
    create_table :events do |t|
      # My custom attributes. Modify to suite your needs.
      # t.string :name
      # t.text :description
      # t.integer :location_id
      # t.integer :host_id
�
      # The core migration
      t.boolean :is_all_day
      t.date :from_date
      t.time :from_time
      t.date :to_date
      t.time :to_time
      t.string :repeats
      t.integer :repeats_every_n_days
      t.integer :repeats_every_n_weeks
      t.integer :repeats_weekly_each_days_of_the_week_mask
      t.integer :repeats_every_n_months
      t.string :repeats_monthly
      t.integer :repeats_monthly_each_days_of_the_month_mask
      t.integer :repeats_monthly_on_ordinals_mask
      t.integer :repeats_monthly_on_days_of_the_week_mask
      t.integer :repeats_every_n_years
      t.integer :repeats_yearly_each_months_of_the_year_mask
      t.boolean :repeats_yearly_on
      t.integer :repeats_yearly_on_ordinals_mask
      t.integer :repeats_yearly_on_days_of_the_week_mask
      t.string :repeat_ends
      t.date :repeat_ends_on
      t.string :time_zone

      t.timestamps
    end
  end
end

@kleinjm, I removed the :attr_accessible lines from IceCubeMethods since ActiveRecord will create those by default based on the DB columns. Also, I'm using this on Rails 5, but I had to use baby_squeel since squeel doesn't support Rails 5 (baby_squeel supports Rails 4/5). To port to baby_squeel, just use Event.where.has{ in EventInstance instead of Event.where{.