Groupdate

The simplest way to group by:

• day
• week
• hour of the day
• and more (complete list below)

:tada: Time zones supported!! the best part

Get the entire series - the other best part

Works with Rails 3.0+

Supports PostgreSQL and MySQL

:cupid: Goes hand in hand with Chartkick

Get Started

Group by day

User.group_by_day(:created_at).count
# {
#   2013-04-16 00:00:00 UTC => 50,
#   2013-04-17 00:00:00 UTC => 100,
#   2013-04-18 00:00:00 UTC => 34
# }

Results are returned in ascending order, so no need to sort.

You can also group by:

• second
• minute
• hour
• week
• month
• year

and

• hour_of_day
• day_of_week (Sunday = 0, Monday = 1, etc)

Time Zones

The default time zone is Time.zone. Change this with:

Groupdate.time_zone = "Pacific Time (US & Canada)"

or

User.group_by_week(:created_at, time_zone: "Pacific Time (US & Canada)").count
# {
#   2013-03-03 08:00:00 UTC => 80,
#   2013-03-10 08:00:00 UTC => 70,
#   2013-03-17 07:00:00 UTC => 54
# }

# equivalently
time_zone = ActiveSupport::TimeZone["Pacific Time (US & Canada)"]
User.group_by_week(:created_at, time_zone: time_zone).count

Week Start

Weeks start on Sunday by default. Change this with:

Groupdate.week_start = :mon # first three letters of day

or

User.group_by_week(:created_at, week_start: :mon).count

Day Start

You can change the hour days start with:

Groupdate.day_start = 2 # 2 am - 2 am

or

User.group_by_day(:created_at, day_start: 2).count

Installation

Add this line to your application’s Gemfile:

gem 'groupdate'

For MySQL

Time zone support must be installed on the server.

mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root mysql

For JRuby

Use the master version of your JDBC adapter. You will get incorrect results for versions before this commit.

# postgresql
gem "activerecord-jdbcpostgresql-adapter", :github => "jruby/activerecord-jdbc-adapter"

# mysql
gem "activerecord-jdbcmysql-adapter", :github => "jruby/activerecord-jdbc-adapter"

Before 2.0

Before 2.0, Groupdate returned an ActiveRecord::Relation instead of a Groupdate::Series by default.

Use series: false for this behavior.

User.group_by_day(:created_at, series: false).count

Note: Results will be unordered, and days with no records will not appear.

History

View the changelog

Groupdate follows Semantic Versioning

Contributing

Everyone is encouraged to help improve this project. Here are a few ways you can help:

• Report bugs
• Fix bugs and submit pull requests
• Write, clarify, or fix documentation
• Suggest or add new features