<%= render :partial => 'event', :collection => @events.sort_by(&:event_at)%>
This code shows a collection ordered as ASC, but i want to order this collection as DESC.
How can I achieve this?
views:
41answers:
3
A:
This should do it =
@events.sort {|a,b| b <=> a}
You can also see the sort documentation on Enumerables.
Damien MATHIEU
2010-10-20 09:18:12
Sorry but im a newbie on ruby and rails. Whats does a, b stand for? Can you write an example with real names? Preferably with events_at
Emil
2010-10-20 09:22:44
a and b are two elements of the array. You specify you want the second one before the first one.
Damien MATHIEU
2010-10-20 09:24:15
Your example should be: <%= render :partial => 'event', :collection => @events.sort{|a,b| b.event_at <=> a.event_at } %>
Yannis
2010-10-20 09:36:52
undefined method `desc' for #<WillPaginate::Collection:0xb5dac298>
Emil
2010-10-20 11:01:30
<%= render :partial => 'event', :collection => @events.sort{|a,b| b.event_at <=> a.event_at } %> This example worked also. Thanks..
Emil
2010-10-20 11:08:53
+1
A:
Even better, you can set a scope to sort your event and use it in your render.
In your Event model:
scope :desc, order("events.event_at DESC")
If you use Rails3, in your view you can simply do:
<%= render @events.desc %>
Yannis
2010-10-20 09:36:09
Then no problem, just adapt my example: `named_scope :desc, :order => ("events.event_at DESC")` and `<%= render :partial => 'event', :collection => @events.desc %>`
Yannis
2010-10-20 10:09:20
I got an error mess when trying this. In event.rb in models i wrote named_scope :desc, :order => ("events.event_at DESC") and then tried to call it with <%= render :partial => 'event', :collection => @events.desc %> but i got the error mess: undefined method `desc' for #<WillPaginate::Collection:0xb5dac298>
Emil
2010-10-20 11:04:02
You should hand the correctly sorted set to will-paginate. Or do something like `Event.paginate :page => params[:page], :order => 'created_at DESC'`
nathanvda
2010-10-20 11:27:10
I do not quite understand your answer can you elaborate? What does 'the correctly sorted set to will-paginate' mean?
Emil
2010-10-20 11:43:38
My mistake: it should have been: `<%= render :partial => 'event', :collection => Event.all.desc %>`. Whatever, if you're using will_paginate, do as nathanvda says (Depending on the version of will_paginate you're using, I think you can do `@events = Event.desc.paginate :page => params[:page]` with the desc named_scope).
Yannis
2010-10-20 12:01:48
Emil
2010-10-20 12:42:19
A:
You can just reverse the sorted collection:
<%= render :partial => 'event', :collection => @events.sort_by(&:event_at).reverse %>
but as Yannis says you are better off sorting as you fetch things from the database ideally.
Shadwell
2010-10-20 10:47:18