On 24 Nov 2008, at 16:35, Charley Mills wrote:
>
> I'm trying to compare two dates (one from a database, and the other is
> the current date). Here is the code I'm using:
>
> ------
> if document.nil?
> "doc_none"
> elsif document.status == 'archived'
> "doc_archived"
> elsif document.expiration_on < 720.days.ago
> "doc_expired_720"
> elsif document.expiration_on < 360.days.ago
> "doc_expired_360"
> elsif document.expiration_on < 90.days.ago
> "doc_expired_90"
> elsif document.expiration_on < 60.days.ago
> "doc_expired_60"
> elsif document.expiration_on < 30.days.ago
> "doc_expired_30"
> elsif document.expiration_on < 0.days.ago
> "doc_expired"
> elsif document.expiration_on < 30.days.from.now
> "doc_expiring_30"
> elsif document.expiration_on < 60.days.from.now
> "doc_expiring_60"
> else
> "doc_current"
> end
> ------
>
So ruby has several classes to do with dates and times.
- Time which is implemented as a number of seconds since an epoch
(usually a 32bit which restricts the range of representable dates)
- Date which is a number of days (with all the niceties to do with
Julian reform, Gregorian reform etc...)
- DateTime which is sort of like Date but which also has time of day
info
date columns on the database comes back as instances of Date, but
0.days.ago etc.. will be instances of Time.
You can convert these around with to_date/to_s.
I might write this as
delta = Date.today - document.expiration_on
case delta
when 720..360 then 'doc_expired_360'
when 360..90 then 'doc_expired_90'
etc...
Fred
> Here is the error in my log:
>
> ------
> ActionView::TemplateError (comparison of Date with Time failed) on
> line
> #46 of app/views/admin/documents/list.rhtml:
> 43: <tr>
> 44: <td><%= link_to
> document.expiration_on.strftime("%Y.%m.%d"), :action => 'show', :id =>
> document %></td>
> 45: <td><%= link_to_organization(document.organization)
> %></td>
> 46: <td class="<%= expiration_class(document) %>">
> 47: <%=hh document.status_readable
> %> </td>
> 48: <td><%= link_to_doctype(document.doctype) %></td>
> 49: <td><%= link_to document.service_date.strftime("%Y.%m.
> %d"),
> :action => 'show', :id => document %></td>
>
> #{RAILS_ROOT}/app/helpers/organizations_helper.rb:12:in `<'
> #{RAILS_ROOT}/app/helpers/organizations_helper.rb:12:in
> `expiration_class'
> #{RAILS_ROOT}/app/views/admin/documents/list.rhtml:46
> #{RAILS_ROOT}/app/views/admin/documents/list.rhtml:42:in `each'
> #{RAILS_ROOT}/app/views/admin/documents/list.rhtml:42
> ------
>
> It sounds like my dates aren't in the same format, but I'm not sure
> what
> the solution is. I'm using mySQL, and the field that I'm grabbing the
> data from is of type "date".
> --
> Posted via http://www.ruby-forum.com/.
>
> >
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