Ruby on Rails条件是哈希

Question

任何人都可以用一些代码帮助我:)，我有一个沉闷的哈希

selector = {
 :fields => ['Id'],
 :predicates => [
   {:field => 'grpId', :operator => 'EQUALS', :values => [params_id]},
   {:field => 'CrType', :operator => 'EQUALS', :values => ['KEYWORD']}
 ]
}

我想为这一行创建一个条件：

{:field => 'grpId', :operator => 'EQUALS', :values => [params_id]},

仅当params_id不为空时才执行

。

谢谢

Answer 1

selector = {
 :fields => ['Id'],
 :predicates => [
   params_id ? {:field => 'grpId', :operator => 'EQUALS', :values => [params_id]} : nil,
   {:field => 'CrType', :operator => 'EQUALS', :values => ['KEYWORD']}
 ].compact
}