添加額外的過濾器參數

Question

假設我有一個控制器的方法：

def my_find(is_published, count) 
    items = Idea.where(published: is_published) 
    #...... 
end 

有時候我想通過一些額外的過濾器參數

def my_find(is_published, count, some_extra_filter = nil) 
    items = Idea.where(published: is_published) #.where (some_extra_filter) 
    #...... 
end 

其中some_extra_filter可以lambda或只是一個普通的sql「其中」string，它也可以是nil或「」。

那麼我如何連接.where(published: is_published)與where (some_extra_filter)得到我所需要的？

Answer 1

這其實是很容易的使用範圍：

def my_find 
    @items = Idea.scoped 
    @items = @items.where(published: is_published) unless is_published.nil? 
    @items = @items.where(other: other_param) if other_params < 10 
    # etc, etc 
end