Ruby on rails 拒绝散列中的空散列
我在params中得到了这个哈希 `用户组属性Ruby on rails 拒绝散列中的空散列,ruby-on-rails,ruby,hash,Ruby On Rails,Ruby,Hash,我在params中得到了这个哈希 `用户组属性 => {"0"=>{"name"=>"hello", "id"=>"1", "_destroy"=>"false", "user_ids"=>["201"]}, "1"=>{"name"=>"hello2", "id"=>"2", "_destroy"=>"false", "user_ids"=>["83"]}, "2"=> {"name"=>"ddddddddd
=> {"0"=>{"name"=>"hello", "id"=>"1", "_destroy"=>"false", "user_ids"=>["201"]},
"1"=>{"name"=>"hello2", "id"=>"2", "_destroy"=>"false", "user_ids"=>["83"]},
"2"=>
{"name"=>"dddddddddd", "id"=>"5", "_destroy"=>"false", "user_ids"=>["256"]},
"3"=>{"name"=>"", "id"=>"", "_destroy"=>"false"}}`
我需要拒绝id为“”的所有内容。如何操作?如果您使用的是
嵌套的\u属性
,则可以执行此操作
hash = {"0"=>{"name"=>"hello", "id"=>"1", "_destroy"=>"false", "user_ids"=>["201"]},
"1"=>{"name"=>"hello2", "id"=>"2", "_destroy"=>"false", "user_ids"=>["83"]},
"2"=>
{"name"=>"dddddddddd", "id"=>"5", "_destroy"=>"false", "user_ids"=>["256"]},
"3"=>{"name"=>"", "id"=>"", "_destroy"=>"false"}}
hash.reject!{|a, b| b["id"].empty?}
#=> {"0"=>{"name"=>"hello", "id"=>"1", "_destroy"=>"false", "user_ids"=>["201"]}, "1"=>{"name"=>"hello2", "id"=>"2", "_destroy"=>"false", "user_ids"=>["83"]}, "2"=>{"name"=>"dddddddddd", "id"=>"5", "_destroy"=>"false", "user_ids"=>["256"]}}
accepts_nested_attributes_for :user_groups, reject_if: lambda{|attr| attr[:id].blank?}
我知道您没有在问题或标记中指定Rails,但我觉得这个问题仍然很难回答。首先向我们展示您为此编写的代码。对我们来说,更正代码比编写代码更容易,也更好,然后您必须将代码硬塞进程序中。不过,作为一个起点,是您的朋友。Mary,由于Vimsha的计算中没有使用
hash
键的值,因此块变量a
可以替换为下划线(作为占位符),如果您希望提请注意这一事实:hash.reject!{| |,b | b[“id”]为空?}
。