blocks|key|1072880|text|gem+will_paginate将对ActiveRecord查询和数组进行分页。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1072881|list+=+OpinionRating.where(:opinion_id+=>+params[:id]).includes(:profile).paginate(:page+=>+params[:page])
@agree_list+=+list.map(&:profile)|code-block|syntax|javascript|1072882|entityMap^0|4|D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

The gem <code>will_paginate</code> will paginate both ActiveRecord queries and arrays.

<pre><code>list = OpinionRating.where(:opinion_id =&gt; params[:id]).includes(:profile).paginate(:page =&gt; params[:page])
@agree_list = list.map(&amp;:profile)
</code></pre>

blocks|key|858391|text|我利用了rails关联，并提出了一种新方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|858392|def+agree_list
++o+=+Opinion.find(params[:id])
++@agree_list+=+o.opinion_ratings(:conditions+=>+{:agree+=>+true},+:order+=>+'created_at+DESC').paginate+:page+=>+params[:page]
rescue+ActiveRecord::RecordNotFound
++redirect_to(profile_opinion_path(session[:user]))
end|code-block|syntax|javascript|858393|在我看来，我是这样查看个人资料的：|858394|<%25+@agree_list.each+do+%7Crating%7C+%25>
++<%25+user+=+Profile.find(rating.profile_id)+%25>
<%25+end+%25>|858395|如果有更好的方法，请发帖。我尝试在OpinionRating模型中使用named_scope帮助器，但没有成功。下面是我尝试过的一个例子，但不起作用：|858396|named_scope+:with_profile,+lambda+{%7Cid%7C+{+:joins+=>+[:profile],+:conditions+=>+['profile_id+=+?',+id]+}+}|858397|这看起来和使用find方法是一样的。|858398|谢谢你的帮助。|858399|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

I took advantage of rails associations, and came up with a new method: 

<pre><code>def agree_list
 o = Opinion.find(params[:id])
 @agree_list = o.opinion_ratings(:conditions =&gt; {:agree =&gt; true}, :order =&gt; 'created_at DESC').paginate :page =&gt; params[:page]
rescue ActiveRecord::RecordNotFound
 redirect_to(profile_opinion_path(session[:user]))
end
</code></pre>

In my view I looked up the profile like so: 

<pre><code>&lt;% @agree_list.each do |rating| %&gt;
 &lt;% user = Profile.find(rating.profile_id) %&gt;
&lt;% end %&gt;
</code></pre>

Please post up if there's a better way to do this. I tried to use the named_scope helper in the OpinionRating model with no luck. Here's an example of what I tried, but doesn't work:

<pre><code>named_scope :with_profile, lambda {|id| { :joins =&gt; [:profile], :conditions =&gt; ['profile_id = ?', id] } }
</code></pre>

That seemed like the same as using the find method though.

Thanks for all the help.

blocks|key|1072976|text|will_paginate+3.0旨在利用Rails3中的新ActiveRecord::Relation，因此默认情况下它只在关系上定义paginate。它仍然可以与数组一起工作，但您必须告诉rails需要该部分。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1072977|在您的config/initializers+(我使用的是will_paginate_array_fix.rb)的文件中，添加以下内容|1072978|require+'will_paginate/array'|code-block|syntax|javascript|1072979|然后，您可以对数组使用|1072980|my_array.paginate(:page+=>+x,+:per_page+=>+y)|1072981|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/mislav/will_paginate^0|U|M|1W|8|0|D|0|0|3|J|T|Q|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1B|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1C|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|1D|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

<a href="https://github.com/mislav/will_paginate" rel="noreferrer">will_paginate</a> 3.0 is designed to take advantage of the new <code>ActiveRecord::Relation</code> in Rails 3, so it defines <code>paginate</code> only on relations by default. It can still work with an array, but you have to tell rails to require that part.

In a file in your <code>config/initializers</code> (I used <code>will_paginate_array_fix.rb</code>), add this

<pre><code>require 'will_paginate/array'
</code></pre>

Then you can use on arrays

<pre><code>my_array.paginate(:page =&gt; x, :per_page =&gt; y)
</code></pre>

blocks|key|858509|text|如果您不想使用配置文件或遇到问题，也可以确保返回ActiveRecord::Relation而不是数组。例如，将agree_list改为用户ids列表，然后对这些ids执行IN以返回关系。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|858510|def+agree_list
++list+=+OpinionRating.find_all_by_opinion_id(params[:id])
++@agree_id_list+=+[]
++list.each+do+%7Cr%7C
++++user+=+Profile.find(r.profile_id)
++++@agree_id_list+<<+user.id
++end
++@agree_list+=+User.where(:id+=>+@agree_id_list)+
end|code-block|syntax|javascript|858511|从数据库的角度来看，这是低效的，但是对于任何对will_paginate配置文件有问题的人来说，这都是一个选择。|858512|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you don't want to use the config file or are having trouble with it, you can also just ensure you return an ActiveRecord::Relation instead of an array. For instance, change the agree_list to be a list of user ids instead, then do an IN on those ids to return a Relation. 

<pre><code>def agree_list
 list = OpinionRating.find_all_by_opinion_id(params[:id])
 @agree_id_list = []
 list.each do |r|
 user = Profile.find(r.profile_id)
 @agree_id_list &lt;&lt; user.id
 end
 @agree_list = User.where(:id =&gt; @agree_id_list) 
end
</code></pre>

This is inefficient from a database perspective, but it's an option for anybody having issues with the will_paginate config file.

blocks|key|858528|text|你可以实现分页，即使没有任何gem.I。我看到了这个How+do+I+paginate+an+Array?。在kaminari+gems文档中的简单实现。请参阅我从kaminari+gems文档中获得的以下示例|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|858529|arr+=+(1..100).to_a
page,+per_page+=+1,+10
arr[((page+-+1)+*+per_page)...(page+*+per_page)]+#=>+[1,+2,+3,+4,+5,+6,+7,+8,+9,+10]
page,+per_page+=+2,+10
arr[((page+-+1)+*+per_page)...(page+*+per_page)]+#=>+[11,+12,+13,+14,+15,+16,+17,+18,+19,+20]|code-block|syntax|javascript|858530|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/kaminari/kaminari/wiki/Kaminari-recipes#-how-do-i-paginate-an-array^0|Q|R|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You can implement pagination even without any gem.I saw this <a href="https://github.com/kaminari/kaminari/wiki/Kaminari-recipes#-how-do-i-paginate-an-array" rel="nofollow noreferrer">How do I paginate an Array?</a>. Simple implementation in kaminari gems doc. Please see the below example which i got from kaminari gems doc

<pre><code>arr = (1..100).to_a
page, per_page = 1, 10
arr[((page - 1) * per_page)...(page * per_page)] #=&gt; [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
page, per_page = 2, 10
arr[((page - 1) * per_page)...(page * per_page)] #=&gt; [11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
</code></pre>

I was wondering if someone could explain how to use <a href="https://github.com/mislav/will_paginate" rel="noreferrer">will_paginate</a> on an array of objects?

For example, on my site I have an opinion section where users can rate the opinions. Here's a method I wrote to gather the users who have rated the opinion:

<pre><code>def agree_list
 list = OpinionRating.find_all_by_opinion_id(params[:id])
 @agree_list = []
 list.each do |r|
 user = Profile.find(r.profile_id)
 @agree_list &lt;&lt; user
 end
end
</code></pre>

Thank you

Ruby on Rails will_paginate an array

数据库

我想知道是否有人能解释一下如何在对象数组上使用？例如，在我的网站上，我有一个评论部分，用户可以在那里对意见进行评分。这是我写的一个方法，用来收集评价意见的用户：def agree_list  list = OpinionRating.find_all_by_opinion_id(params[:id])  @agree...

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