如何在Rails Active Record中實現AND子句？

Question

我有以下查詢：

select source_names.id as source_id, source_names.name as source_name, source_types.id as source_type_id,source_types.name type_name,event_sources.id 
    from source_names 
    left join source_types 
    on source_type_id = source_types.id 
    left join event_sources 
    on source_names.id = event_sources.source_id and event_id = 1 


result = SourceName.joins(' 
           LEFT JOIN source_types ON source_type_id = source_types.id 
           LEFT JOIN event_sources ON source_names.id = event_sources.source_id 
           ').where('event_id =?',event_id).select('source_names.id as source_id, source_names.name as source_name, source_types.id as source_type_id,source_types.name type_name,event_sources.id').all 

產量：

select source_names.id as source_id, source_names.name as source_name, source_types.id as source_type_id,source_types.name type_name,event_sources.id 
     from source_names 
     left join source_types 
     on source_type_id = source_types.id 
     left join event_sources 
     on source_names.id = event_sources.source_id WHERE event_id = 1 

但我想and event_id = 1

你怎麼我做到了嗎？

Answer 1

如果你不想要一個WHERE，不要使用.where

只需將它添加到您的連接：

SourceName.joins(' 
    LEFT JOIN source_types ON source_type_id = source_types.id 
    LEFT JOIN event_sources ON source_names.id = event_sources.source_id and event_sources.event_id = 1')