在Rails（2.x或3.x）中優化視圖性能的技巧/訣竅？

Question

人們可以怎樣優化Rails 2.x（和3.x）中視圖的渲染？

我們的應用程序花費大部分時間渲染視圖（最小DB調用）。

我們該如何加速性能/渲染視圖？

謝謝！

Answer 1

加速erb渲染的推薦方法是避免這樣做。嘗試使用頁面緩存或條件GET頭來避免重新呈現未更改的內容。

http://guides.rubyonrails.org/caching_with_rails.html

class ProductsController < ApplicationController 

    def show 
    @product = Product.find(params[:id]) 

    # If the request is stale according to the given timestamp and etag value 
    # (i.e. it needs to be processed again) then execute this block 
    if stale?(:last_modified => @product.updated_at.utc, :etag => @product) 
     respond_to do |wants| 
     # ... normal response processing 
     end 
    end 

    # If the request is fresh (i.e. it's not modified) then you don't need to do 
    # anything. The default render checks for this using the parameters 
    # used in the previous call to stale? and will automatically send a 
    # :not_modified. So that's it, you're done. 
end