mark multiple results

rubyonrails-talk
1

Hi…

I have a query

@users = User. …some finding code

<% @users.each do |u| %>
<li><%= u.user_id %><%= u.user.name %></li>




Result is something like this:

•   1 fred
•   1 fred
•   9 charlie

The result could be 10 different user and/or some could be double or triple. I want to css mark them when they appear multipe. How is the best way to find out which user_id’s are size/count >=2 in user? To make it clear: I dont want to find out double entries in my model, but in the result.

Thanks for support.
2

class User   attr_accessor :id, :name

  def initialize(id, name)     @id = id     @name = name   end end

charlie = User.new(9, 'Charlie') fred = User.new(1, 'Fred') sally = User.new(3, 'Sally')

@users = [   fred,   fred,   fred,   sally,   charlie,   sally ]

user_counts = Hash.new(0)

@users.each {|user| user_counts[user] += 1} p user_counts puts

--output:-- {#<User:0x00000100867be8 @id=1, @name="Fred">=>3, #<User:0x00000100867b70 @id=3, @name="Sally">=>2, #<User:0x00000100867d00 @id=9, @name="Charlie">=>1}

ordered_results = user_counts.sort_by{|user| -user_counts[user]} p ordered_results puts

--output:-- [[#<User:0x00000100867be8 @id=1, @name="Fred">, 3], [#<User:0x00000100867b70 @id=3, @name="Sally">, 2], [#<User:0x00000100867d00 @id=9, @name="Charlie">, 1]]

cutoff = 2 most_appearances = ordered_results.take_while {|user, count| count >= cutoff} p most_appearances puts

--output:-- [[#<User:0x00000100867be8 @id=1, @name="Fred">, 3], [#<User:0x00000100867b70 @id=3, @name="Sally">, 2]]

top_users = most_appearances.map {|user, count| user} p top_users

--output:-- [#<User:0x00000100867be8 @id=1, @name="Fred">, #<User:0x00000100867b70 @id=3, @name="Sally">]

3

Maybe this helps:

http://api.rubyonrails.org/classes/Enumerable.html#method-i-group_by

http://railscasts.com/episodes/29-group-by-month

You may do @users.group_by(&:id) … but I’m not sure what you have in your search methods

Javier

4

Javier Quarite wrote in post #1076666:

Maybe this helps:

Enumerable #29 group_by Month - RailsCasts

You may do @users.group_by(&:id) ... but I'm not sure what you have in

Each user has a unique id, so what does that get you? Groups with one user per group.

5

Hi Javier…

I want to show all entries…they have different other attributes but the same user (name)…thats why group_by is not what I can use. Just want to mark them ‘bold’ …so I need a true/false for every result item… Thanks so far…

Werner

6

Hi Javier..

I want to show all entries..they have different other attributes but the same user (name)..thats why group_by is not what I can use. Just want to mark them 'bold' ..so I need a true/false for every result item..

You could do this with JavaScript pretty easily. Assuming you have a UL full of results, your code could look like this (Prototype.js):

  var users = $$('#my_list li');   users.each(function(elm){     if(elm.siblings().include(function(s){ return s.innerHTML == elm.innerHTML; }).length > 0){       elm.addClassName('multiple');     }   });

Walter

7

Thanks… this is helpfull Greetings