source.mihelac.org - Rails in practice - Group records by condition Comments

Comment on 'Rails in practice - Group records by condition' by myname

2008-02-01T22:56:52Z

really nice one

Comment on 'Rails in practice - Group records by condition' by Bojan Mihelac

2007-12-18T07:11:24Z

Bischov, what you have in block that you are sending to classify?

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2007-12-17T03:59:22Z

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Comment on 'Rails in practice - Group records by condition' by Bischov

2007-11-28T11:59:52Z

Hi,

thanks for this – it’s really needed a lot. But with the first method (.to_set.classify), I have a problem, it will only return the first group, instead of all the groups.

I am creating the sets on a varchar column like this:

week52 title1 title2 title3 week51 title1 title2 week49 title1 title2 title3

...and so on…with your example, only week52 is in the returned set.

when I use Brandon’s method, all groups are returned, but as you said it, unsorted, which is no good for me.

Please help!

Comment on 'Rails in practice - Group records by condition' by bmihelac

2007-07-15T08:01:57Z

Good point Brandon. group_by method of Rails extension to Enumerable can also be used (and is more readable too), but still it returns hash and not array. If you sort hash you would get nested array.

Comment on 'Rails in practice - Group records by condition' by Brandon Keepers

2007-07-14T19:43:40Z

Enumberable also defines group_by, which does something similar, but uses an array of arrays which, unlike, hash, is ordered.

@groups = NewsArticle.find(:all).group_by {|article| article.published_on.year}

<%@groups.each do |(year, articles)|%>

  <h1><%=year%></h1>
  <%=articles.collect {|a| \"<p>a.name</p>\"}.join%>
<%end%>