MANY_TO_MANY，STI，將分頁

我有以下代碼MANY_TO_MANY，STI，將分頁

class Category < ActiveRecord::Base 
    has_many :categorizations 
    has_many :posts, :through => :categorizations 
end 

class Post < ActiveRecord::Base 
    has_many :categorizations 
    has_many :categories, :through => :categorizations 
end 

class Categorization < ActiveRecord::Base 
    belongs_to :post 
    belongs_to :category 
end 

class NewsArticle < Post 
end

OK，看起來不錯。 I'me試圖從類別

@news_articles = NewsArticle.paginate_by_category_id params[:category], 
    :page => params[:page], :per_page => 10, 
    :order => 'posts.created_at DESC'

所有NewsArticle的，我看到

NoMethodError in News articlesController#category 

undefined method `find_all_by_category' for #<Class:0x103cb05d0>

我能做些什麼來解決這個問題？

來源

2009-11-10 Alexey Poimtsev

我想補充的命名範圍，並與PAGINATE使用它們：

class Post < ActiveRecord::Base 
    .. 
    named_scope :newest, :order => 'posts.created_at DESC' 
    named_scope :by_category, lambda { |category_id| { 
    :joins => :categories, 
    :conditions => ['categories.category_id = ?', category_id] 
    } } 
end 

@news_articles = NewsArticle.newest.by_category(params[:category]).paginate(
    :page => params[:page], :per_page => 10 
)

來源

2009-11-11 07:30:03

看起來好多了:)）謝謝:)但不幸的帖子無法找到，如果類別模型是在friendly_id（http://github.com/norman/friendly_id）:( PS：你的例子小修正 - ：conditions => ['categories.id =？'，category_id] – 2009-11-11 07:51:11

我有更新你的例子有點現在它工作正常 @category = Category.find params [：category] @news_articles = NewsArticle.newest.by_category（@ category.id）..... – 2009-11-11 08:50:17

如何：

@news_articles = NewsArticle.paginate(:conditions => { :category_id => params[:category_id].to_i }, :page => params[:page], :per_page => 10, :order => 'posts.created_at DESC')

你通過類別ID爲params[:category]或params[:category_id]？如果你不確定你可以在你看來debug(params)。

來源

2009-11-11 01:31:21 bensie

更好，但是現在看起來「沒有這樣的列：posts.category_id」我傳遞類別ID爲PARAMS [：類別] – 2009-11-11 07:18:03

嘗試切換到：order =>：category_id – bensie 2009-11-11 16:22:45

MANY_TO_MANY，STI，將分頁

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