：限制在收集中找到的行数（has_many 关联）
类别
has_many :products
has_many :deals, :through => :products
产品
has_many :deals
我想在类别页面上显示有限数量的交易。
在categories_helper.rb中：
def deals
@category.products.collect { |c| c.deals}.flatten
end
在show.html.erb（类别）中：
<% for deal in deals %>
<%= deal.name %>
<% end %>
这工作正常，但它显然会抛出该类别中产品的所有交易，我想要只有8个。 所以我想将 (:limit => 8) 应用于 .collect。我只是不知道它会去哪里。 另外，我想使用 (:offset => 8) 进行第二次查找，我只会根据要求显示它。
Category
has_many :products
has_many :deals, :through => :products
Product
has_many :deals
I want to display a limited number of deals on a category page.
In categories_helper.rb:
def deals
@category.products.collect { |c| c.deals}.flatten
end
In the show.html.erb (Category):
<% for deal in deals %>
<%= deal.name %>
<% end %>
This works fine, BUT it obviously throws out all deals for the products in that category and I want only 8 of them. So I would like to apply a (:limit => 8) to the .collect. I just can't figure out where it would go. Also I would like to do a second find with an (:offset => 8) which I'll show only on request.
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评论（2）
这应该有效：
This should work:
您不需要
collect，因为您具有has-many-through关联。我相信这就是您正在寻找的：You don't need the
collectsince you have thehas-many-throughassociation. I believe this is what you're looking for: