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bingo bob

2008-Dec-27 14:23 UTC

building an array of dates

I need to build an array that contains lots of date objects.

I''ve got a booking model and it contains stuff like this...


  create_table "bookings", :force => true do |t|
    t.string   "firstname"
    t.string   "lastname"
    t.integer  "number_of_people"
    t.integer  "deposit"
    t.integer  "price"
    t.integer  "days"
    t.datetime "from"
    t.datetime "to"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

SOO - each booking starts on a date and finishes on a date...

I need to collect up all the booking dates in an array so that I can do
stuff with them...

I figure i need a method in my model to do it...

something like

  def self.all_booking_dates

    find(:all);  # first off find all the booking records

    @BookedDays = ( XXX ).map # do something here to create an array
with all the dates in, maybe I need a loop  ... sorry bit stuck?

  end

be grateful for any tips.

thanks...
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Jeremy Weiskotten

2008-Dec-27 16:11 UTC

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Re: building an array of dates

bingo bob wrote:> I need to collect up all the booking dates in an array so that I can do
> stuff with them...
> 
> I figure i need a method in my model to do it...
> 
> something like
> 
>   def self.all_booking_dates
> 
>     find(:all);  # first off find all the booking records
> 
>     @BookedDays = ( XXX ).map # do something here to create an array
> with all the dates in, maybe I need a loop  ... sorry bit stuck?
> 
>   end
To get an array of dates for just one booking, you can build a range and 
then convert it to an array:

(from..to).to_a

To get the array of dates for a set of bookings (such as all bookings), 
I think something like this is what you''re looking for:

bookings.map { |b| (b.from..b.to).to_a }.flatten.uniq.sort
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bingo bob

2008-Dec-27 16:28 UTC

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Re: building an array of dates

Thanks, I''ll try that.

I got to here myself, but it''s not right ! I think it''s close
though and
I find this syntax easier to read.

def availability

  @bookings = Booking.find(:all)

  for booking in @bookings do
    bookingfirstday = booking.from.to_date
    bookinglastday = booking.to.to_date
    @BookedDays = (bookingfirstday..bookinglastday).map
  end

end

Can you explain why it''s wrong ?

The result is that I @BookedDays only gets set to the last evaluated 
booking (I think).

I will try your way though, thanks. (I''d like to get my way working
also
if poss)?

Is the loop rewriting @BookedDays each time around rather than adding to 
it?

ta

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Jeremy Weiskotten

2008-Dec-27 16:37 UTC

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Re: building an array of dates

bingo bob wrote:> 
> Thanks, I''ll try that.
> 
> I got to here myself, but it''s not right ! I think it''s
close though and
> I find this syntax easier to read.
> 
> def availability
> 
>   @bookings = Booking.find(:all)
> 
>   for booking in @bookings do
>     bookingfirstday = booking.from.to_date
>     bookinglastday = booking.to.to_date
>     @BookedDays = (bookingfirstday..bookinglastday).map
>   end
> 
> end
> 
> Can you explain why it''s wrong ?
> 
> The result is that I @BookedDays only gets set to the last evaluated 
> booking (I think).
> 
> I will try your way though, thanks. (I''d like to get my way
working also
> if poss)?
> 
> Is the loop rewriting @BookedDays each time around rather than adding to 
> it?
> 
> ta
There are a couple problems. The first is that, yes, @BookedDays is 
being rewritten, not appended to. You need to initialize the array 
before the loop starts (@BookedDays = []) and use the += method to 
append to it. Also, you should renamed that variable to @booked_days. 
You can do this with a for-loop, but I suggest getting used to the 
closured-oriented methods in Enumerable and Array. Your code will be 
much more concise and expressive.
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bingo bob

2008-Dec-27 17:08 UTC

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Re: building an array of dates

Thanks that''s very clear and helpful, I''ll try and use the
more concise
method.

It''s working for me and I understand why my version wasn''t.

Maybe my brain is squished but I''ve done the hard thing and now this 
next more simple loop is causing me problems in my view. I wish to show 
12 calendars from the current month to 12 months on.

So I know how to display one....<working>

<%= calendar(:year => 2009, :month => 1) do |d|

    if @BookedDays.include?(d)
      [d.mday, {:class => "specialDay"}]
    else
      [d.mday, {:class => "normalDay"}]
    end

end

%>

How do I display twelve of em...I know this is uber easy but I can''t
get
it to work.

I firgure something like what follows is useful but I cant get the loop 
within the loop working in the view.

<%
start = Time.now.month
finish = Time.now.month + 12
%>




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Jeremy Weiskotten

2008-Dec-28 00:44 UTC

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Re: building an array of dates

bingo bob wrote:
> How do I display twelve of em...I know this is uber easy but I
can''t get
> it to work.
> 
> I firgure something like what follows is useful but I cant get the loop 
> within the loop working in the view.
> 
> <%
> start = Time.now.month
> finish = Time.now.month + 12
> %>
Yeah, that''s not going to work. The easiest way is probably something 
like this:

<% d = Date.today %>
<% 12.times do %>

  <%= calendar(:year => d.year, :month => d.month) do |d|
    if @BookedDays.include?(d)
      [d.mday, {:class => "specialDay"}]
    else
      [d.mday, {:class => "normalDay"}]
    end
  end
  %>

<% d >>= 1 # advance 1 month %>
<% end %>
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Robby Russell

2008-Dec-28 16:47 UTC

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Re: building an array of dates

On Sat, Dec 27, 2008 at 4:44 PM, Jeremy Weiskotten
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> bingo bob wrote:
>
>> How do I display twelve of em...I know this is uber easy but I
can''t get
>> it to work.
>>
>> I firgure something like what follows is useful but I cant get the loop
>> within the loop working in the view.
>>
>> <%
>> start = Time.now.month
>> finish = Time.now.month + 12
>> %>
>
> Yeah, that''s not going to work. The easiest way is probably
something
> like this:
>
> <% d = Date.today %>
> <% 12.times do %>
>
>  <%= calendar(:year => d.year, :month => d.month) do |d|
>    if @BookedDays.include?(d)
>      [d.mday, {:class => "specialDay"}]
>    else
>      [d.mday, {:class => "normalDay"}]
>    end
>  end
>  %>
>
> <% d >>= 1 # advance 1 month %>
> <% end %>

Small critique here on your code style. @BookedDays doesn''t really
follow Ruby on Rails conventions. Camel-case should only be used by
class/module definitions and references. @booked_days is the
convention that Rails encourages.

This might be something that you''ve decided based on a personal or
team preference, but in case you''re not attached to it, following
Rails conventions will make your life and anybody else that later
works on a project.. a little easier. :-)

Cheers,
Robby

-- 
Robby Russell
Chief Evangelist, Partner

PLANET ARGON, LLC
design // development // hosting w/Ruby on Rails

http://www.planetargon.com/
http://www.robbyonrails.com/
aim: planetargon

+1 503 445 2457
+1 877 55 ARGON [toll free]
+1 815 642 4068 [fax]

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Rails - Dec 2008 - building an array of dates

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