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https://github.com/excid3/simple_calendar

A wonderfully simple calendar gem for Rails
https://github.com/excid3/simple_calendar

calendar custom-calendar meeting month ruby week-calendar

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A wonderfully simple calendar gem for Rails

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# Simple Calendar



### 📆 A calendar for your Ruby on Rails app.



[![Build Status](https://github.com/excid3/simple_calendar/workflows/Tests/badge.svg)](https://github.com/excid3/simple_calendar/actions) [![Gem Version](https://badge.fury.io/rb/simple_calendar.svg)](https://badge.fury.io/rb/simple_calendar)



Simple Calendar is designed to do one thing really really well: render a calendar.



It lets you render a calendar of any size. Maybe you want a

day view, a 4 day agenda, a week view, a month view, or a 6 week

calendar. You can do all of that with the new gem, just give it a range

of dates to render.



It doesn't depend on any ORM so you're free to use it with ActiveRecord, Mongoid, any other ORM, or pure Ruby objects.



Thanks to all contributors for your wonderful help!



![calendar](https://s3.amazonaws.com/f.cl.ly/items/1T0t1s0W212d28282V2M/Screen%20Shot%202013-03-28%20at%209.44.49%20AM.png)



Installation

------------



Just add this into your Gemfile followed by a bundle install:

```ruby

gem "simple_calendar"

```



If you're using Bootstrap, the calendar should already have a border and

nice spacing for days.



Optionally, you can include the default stylesheet for the calendar in

your `app/assets/stylesheets/application.css` file:



```scss

*= require simple_calendar

```



or in your SCSS `app/assets/stylesheets/application.scss` file:



```scss

@import "simple_calendar";

```



Usage

-----



Generating calendars is extremely simple with simple_calendar.



The first parameter is a symbol that looks up the current date in

`params`. If no date is found, it will use the current date.



In these examples, we're using `:start_date` which is the default.



### Month Calendar



You can generate a calendar for the month with the `month_calendar`

method.



```erb

<%= month_calendar do |date| %>

  <%= date %>

<% end %>

```



To show the day of the month instead of the date, use `<%= date.day %>`



### Week Calendar



You can generate a week calendar with the `week_calendar` method.



```erb

<%= week_calendar(number_of_weeks: 2) do |date| %>

  <%= date %>

<% end %>

```



Setting `number_of_weeks` is optional and defaults to 1.



### Custom Length Calendar



You can generate calendars of any length by passing in the number of days you want to render.



```erb

<%= calendar(number_of_days: 4) do |date| %>

  <%= date %>

<% end %>

```



Setting `number_of_days` is optional and defaults to 4.



### Custom Parameter Name



You can pass in `start_date_param` to change the name of the parameter

in the URL for the current calendar view.



```erb

<%= calendar(start_date_param: :my_date) do |date| %>

  <%= date %>

<% end %>

```



### Custom Partial



You can set a different partial name for calendars by passing the partial path.



```erb

<%= calendar(partial: 'products/calendar') do |date| %>

  <%= date %>

<% end %>

```



### Internationalization (I18n)



The default views are prepared to do translation lookups for month names and weekdays.



To profit from that, you can take advantage of the [`rails-i18n`](https://github.com/svenfuchs/rails-i18n/) gem which comes with translations for many languages already.



In a Rails 6 app, the configuration could look like the following:



  * Add `gem 'rails-i18n'` to your `Gemfile` and run `bundle`.

  * Define the available and default locale e.g. in `config/application.rb`:

```ruby

# config/application.rb

config.i18n.available_locales = [:en, :de, :fr]

config.i18n.default_locale = :en

```

  * Define the following translation keys:

```yaml

# e.g. config/locales/de.yml

de:

  simple_calendar:

    previous: "<<"

    next: ">>"

    week: Woche

```



See the [Rails I18n Guide](https://guides.rubyonrails.org/i18n.html) for further information.



## Rendering Events



What's a calendar without events in it? There are two simple steps for creating

calendars with events.



The first step is to add the following to your model. We'll be using a

model called Meeting, but you can add this to any model or Ruby object.



Here's an example model:



```bash

# single day events

$ rails g scaffold Meeting name start_time:datetime



# multi-day events

$ rails g scaffold Meeting name start_time:datetime end_time:datetime

```



By default it uses `start_time` as the attribute name.

**If you'd like to use another attribute other than start_time, just

pass it in as the `attribute`**



```erb

<%= month_calendar(attribute: :starts_at) do |date| %>

  <%= date %>

<% end %>

```



Optionally the `end_time` attribute can be used which enables multi-day event rendering.



**Just pass in the `attribute` and `end_attribute` options respectively**



```erb

<%= month_calendar(attribute: :start_date, end_attribute: :end_date) do |date| %>

  <%= date %>

<% end %>

```



**If you already have a model with a start time attribute called something other than `start_time` or accesses it through a relationship, you can alias the attribute by defining a `start_time` method in the my_model.rb file and not have to specify it separately as in the above example**

```ruby

class MyModel

    ## Other code related to your model lives here



    def start_time

        self.my_related_model.start ##Where 'start' is a attribute of type 'Date' accessible through MyModel's relationship

    end

end

```



In your controller, query for these meetings and store them in an instance

variable. Normally you'll want to search for the ones that only show up

inside the calendar view (for example, you may only want to grab the events for

the current month).



We'll just load up all the meetings for this example.



```ruby

def index

  # Scope your query to the dates being shown:

  start_date = params.fetch(:start_date, Date.today).to_date

  @meetings = Meeting.where(starts_at: start_date.beginning_of_month.beginning_of_week..start_date.end_of_month.end_of_week)

end

```



Then in your view, you can pass in the `events` option to render. The

meetings will automatically be filtered out by day for you.



```erb

<%= month_calendar(events: @meetings) do |date, meetings| %>

  <%= date %>



  <% meetings.each do |meeting| %>

    


      <%= meeting.name %>

    


  <% end %>

<% end %>

```



If you pass in objects that don't respond to the attribute method (like

starts_at), then all the meetings will be yielded each day. This lets you

do custom filtering however you want.



## Customizing The Calendar



There are a handful of configuration options that you can use in

simple_calendar.



### Customizing Views



You can customize the layouts for each of the calendars by running the

generators for simple_calendar:



```bash

$ rails g simple_calendar:views

```



This will generate a folder in app/views called simple_calendar that you

edit to your heart's desire.



### Time Zones



Setting `Time.zone` will make sure the calendar start days are correctly computed

in the right timezone. You can set this globally in your `application.rb` file or

if you have a User model with a time_zone attribute, you can set it on every request by using

a before_action like the following example.



This code example uses [Devise](https://github.com/plataformatec/devise)'s

`current_user` and `user_signed_in?` methods to retrieve the user's timezone and set it for the duration of the request.

Make sure to change the `:user_signed_in?` and `current_user` methods if you are

using some other method of authentication.



```ruby

class ApplicationController < ActionController::Base

  before_action :set_time_zone, if: :user_signed_in?



  private



    def set_time_zone

      Time.zone = current_user.time_zone

    end

end

```



If you want to set the time zone globally, you can set the following in

`config/application.rb`:



```ruby

config.time_zone = 'Central Time (US & Canada)'

```



### Beginning Of Week



You can also change the beginning day of the week by setting

`Date.beginning_of_week` in a `before_action` just like in the previous

example. If you want to set this globally, you can put this line in

`config/application.rb`:



```ruby

config.beginning_of_week = :sunday

```



### Custom CSS Classes



Setting classes on the table and elements are pretty easy.



simple_calendar comes with a handful of useful classes for each day in

the calendar that you can use:



```scss

.simple-calendar {

  .day {}



  .wday-0 {}

  .wday-1 {}

  .wday-2 {}

  .wday-3 {}

  .wday-4 {}

  .wday-5 {}

  .wday-6 {}



  .today {}

  .past {}

  .future {}



  .start-date {}



  .prev-month {}

  .next-month { }

  .current-month {}



  .has-events {}

}

```



Just paste this into a CSS file and add your styles and they will be

applied to the calendar. All of these classes are inside of the

simple-calendar class so you can scope your own classes with similar

names.



### Custom Header Title And Links



Header and title links are easily adjusted by generating views and

modifying them inside your application.



For example, if you'd like to use abbreviated month names, you can modify

the views from this:



```erb

<%= t('date.month_names')[start_date.month] %> <%= start_date.year %>

```



To



```erb

<%= t('date.abbr_month_names')[start_date.month] %> <%= start_date.year %>

```



Your calendar will now display "Sep 2015" instead of "September 2015" at

the top! :)



### AJAX Calendars



Rendering calendars that update with AJAX is pretty simple. You'll need

to follow these steps.



- Run `rails g simple_calendar:views` to generate the views.

- Add an ID to the calendar view's outer div. `
`

- Add `remote: true` option to the next & preview links like [this](https://github.com/excid3/simple_calendar-ajax-example/blob/ac8a1dc933d5933608421f8b53a5f5cf756b942f/app/views/simple_calendar/_month_calendar.html.erb#L3).

- Create `js.erb` file to respond to JS requests, render the new calendar, and replace the calendar on the page by ID like [this](https://github.com/excid3/simple_calendar-ajax-example/blob/master/app/views/events/index.js.erb).



The response can simply replace

the HTML of the div with the newly rendered calendar.



Take a look at **[excid3/simple_calendar-ajax-example](https://github.com/excid3/simple_calendar-ajax-example)** to see how it is done.



If you are using [Hotwire](https://hotwired.dev/), just wrap in a Turbo Frame.

Like this:



```erb

<%= turbo_frame_tag 'calendar' do %>

  <%= month_calendar do |date| %>

    <%= date.day %>

  <% end %>

<% end %>

```



## Custom Calendars



The three main calendars available should take care of most of your

needs, but simple_calendar makes it easy to create completely custom

calendars (like maybe you only want business weeks).



If you'd like to make a completely custom calendar, you can create a new

class that inherits from `SimpleCalendar::Calendar`. The name you give

it will correspond to the name of the template it will try to render.



The main method you'll need to implement is the `date_range` so that

your calendar can have a custom length.



```ruby

class SimpleCalendar::BusinessWeekCalendar < SimpleCalendar::Calendar

  private



    def date_range

      beginning = start_date.beginning_of_week + 1.day

      ending    = start_date.end_of_week - 1.day

      (beginning..ending).to_a

    end

end

```



To render this in the view, you can do:



```erb

<%= render SimpleCalendar::BusinessWeekCalendar.new(self, events: meetings) do |date| %>

  <%= date %>

<% end %>

```



And this will render the

`app/views/simple_calendar/_business_week_calendar.html.erb` partial.



You can copy one of the existing templates to use for the partial for

your new calendar.



## View Specs and Tests



If you're running view specs against views with calendars, you may run into route generation errors like the following:



```

Failure/Error: render

ActionView::Template::Error:

  No route matches {:action=>"show", :controller=>"controller_name", :start_date=>Sun, 29 Mar 2015}

```



If so, you can stub out the appropriate method like so (rspec 3 and up):



```

expect_any_instance_of(SimpleCalendar::Calendar).to receive(:link_to).at_least(:once).and_return("")

```



With modifications as appropriate.



## Author



Chris Oliver 



[https://gorails.com](https://gorails.com)



[@excid3](https://twitter.com/excid3)



## License



Simple Calendar is licensed under the [MIT License](LICENSE.txt).