添加额外的过滤器参数

Question

假设我有一个控制器的方法：

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

有时候我想通过一些额外的过滤器参数

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或只是一个普通的sql“其中”string，它也可以是nil或“”。

那么我如何连接.where(published: is_published)与where (some_extra_filter)得到我所需要的？

Answer 1

这其实是很容易的使用范围：

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