Separate date and time form fields in Rails

I have an ActiveRecord model Eventwith a datetime column starts_at. I would like to present a form, where date and time for starts_at are chosen separately (e.g. "23-10-2010" for date and "18:00" for time). These fields should be backed by the single column starts_at, and validations should preferably be against starts_at, too.

I can of course muck around with virtual attributes and hooks, but I would like a more elegant solution. I have experimented with both composed_of (rdoc), and at开发者_C百科tribute-decorator (lighthouse discussion, github) without success.

Below is a rough outline of what I would like..

class Event < ActiveRecord::Base
  validates_presence_of :start_date
end

# View
# On submission this should set start_date.
form_for @event do |f|
  f.text_field :starts_at_date         # date-part of start_date
  f.text_field :starts_at_time_of_day  # time-of-day-part of start_date
  f.submit
end

Any help appreciated.

Do you have to have a text_field in the view?

As far as I can tell, you can have a date_time field and then just use two different input fields to set the different parts of the field.

form_for @event do |f|
  f.date_select :starts_at
  f.time_select :starts_at, :ignore_date => true
  f.submit
end

Since the rails date and time select helpers set five different parameters (starts_at(1i) for the year part, 2i for the month part, and so on), that means that the date_select only sets them for the date part, while if you pass :ignore_date => true to the time_select, it will only set the hour and minute part.

If you must have a text_field I'm not sure how to do it, but it might be possible to do using some jQuery magic before setting the datetime parameters before sending the form.

Was looking at this today for a Rails project, and came across this gem:

https://github.com/shekibobo/time_splitter

Setting DateTimes can be a difficult or ugly thing, especially through a web form. Finding a good DatePicker or TimePicker is easy, but getting them to work on both can be difficult. TimeSplitter automatically generates accessors for date, time, hour, and min on your datetime or time attributes, making it trivial to use different form inputs to set different parts of a datetime field.

Looks like it would do the job for you

Using a date_select and time_select is a good way to go.

However, I wanted a text_field for the date (so I can use a JavaScript date picker).

Using strong_parameters or Rails 4+:

models/event.rb

# Add a virtual attribute
attr_accessor :start_at_date

views/events/_form.html.haml

- # A text field for the date, and time_select for time
= f.label :start_at
= f.text_field :start_at_date, value: (f.object.start_at.present? ? f.object.start_at.to_date : nil)
= f.time_select :start_at, :ignore_date => true

controllers/events_controller.rb

# If using a date_select, time_select, datetime_select
# Rails expects multiparameter attributes
# Convert the date to the muiltiparameter parts
def event_params
  if !!params[:event] && (params[:event]["start_at(4i)"].present? || params[:event]["start_at(5i)"].present?)

    if params[:event][:start_at_date].present?
      start_at_date = params[:event][:start_at_date]
    else
      start_at_date = Date.today
    end
    year  = start_at_date.match(/^(\d{4})[\-\/]/)[1]
    month = start_at_date.match(/[\-\/](\d{2})[\-\/]/)[1]
    day   = start_at_date.match(/[\-\/](\d{2})$/)[1]
    params[:event]["start_at(1i)"] = year
    params[:event]["start_at(2i)"] = month
    params[:event]["start_at(3i)"] = day
  end
  ...

Elegant solution may provide date_time_attribute gem:

class MyModel < ActiveRecord::Base
  include DateTimeAttribute

  date_time_attribute :starts_at
end

It will allow you to set starts_at_date and starts_at_time separately:

form_for @event do |f|
  f.text_field :starts_at_date
  f.text_field :starts_at_time
  f.submit
end

# this will work too:
form_for @event do |f|
  f.date_select :starts_at_date
  f.time_select :starts_at_time, :ignore_date => true
  f.text_field  :starts_at_time_zone
  f.submit
end

# or
form_for @event do |f|
  f.date_select :starts_at_date
  f.text_field  :starts_at_time
  f.submit
end

It will also allow you to play with time zones, use Chronic etc.

Is this because of a design issue? It is really much easier if you just save starts_at as a datetime data type and use something like:

http://puna.net.nz/timepicker.htm#

It simply runs on top of whatever date fields you have for your model.