Ruby on rails Rails如何从一个查询数据计算多个和

使用以下两种模型，

公司

和

响应

，我将按如下方式查询每个公司的总响应：

@allResponses = Company.find(current_user_company_id).responses

[#<Response id: 1, company_id: 1, created_at: "2013-04-24 02:36:54", feedback_score: 10, feedback_explanation: "I really like the way you guys do xyz.", additional_data: "", updated_at: "2013-04-24 02:36:54">, #<Response id: 2, company_id: 1, created_at: "2013-04-25 03:51:07", feedback_score: 5, feedback_explanation: "customer service is spotty.", additional_data: "", updated_at: "2013-04-25 03:51:07">, #<Response id: 3, company_id: 1, created_at: "2013-04-25 03:52:04", feedback_score: 7, feedback_explanation: "You've got potential.", additional_data: "", updated_at: "2013-04-25 03:52:04">, #<Response id: 4, company_id: 1, created_at: "2013-04-25 03:52:18", feedback_score: 9, feedback_explanation: "Almost perfect.", additional_data: "", updated_at: "2013-04-25 03:52:18">] 

这为我提供了如下数据：

@allResponses = Company.find(current_user_company_id).responses

[#<Response id: 1, company_id: 1, created_at: "2013-04-24 02:36:54", feedback_score: 10, feedback_explanation: "I really like the way you guys do xyz.", additional_data: "", updated_at: "2013-04-24 02:36:54">, #<Response id: 2, company_id: 1, created_at: "2013-04-25 03:51:07", feedback_score: 5, feedback_explanation: "customer service is spotty.", additional_data: "", updated_at: "2013-04-25 03:51:07">, #<Response id: 3, company_id: 1, created_at: "2013-04-25 03:52:04", feedback_score: 7, feedback_explanation: "You've got potential.", additional_data: "", updated_at: "2013-04-25 03:52:04">, #<Response id: 4, company_id: 1, created_at: "2013-04-25 03:52:18", feedback_score: 9, feedback_explanation: "Almost perfect.", additional_data: "", updated_at: "2013-04-25 03:52:18">] 

试试这个

 @sumOfHighScores = @allResponses.select{ |response| response.feedback_score > 8 }.sum
 @sumOfLowScores = @allResponses.select{ |response| response.feedback_score < 7 }.sum

@sumOfHighScores=@allResponses.select{| response | response.feedback_scores>8}.sum
@sumOfLowScores=@allResponses.select{| response | response.feedback_score<7}.sum

试试这个

 @sumOfHighScores = @allResponses.select{ |response| response.feedback_score > 8 }.sum
 @sumOfLowScores = @allResponses.select{ |response| response.feedback_score < 7 }.sum

@sumOfHighScores=@allResponses.select{| response | response.feedback_scores>8}.sum
@sumOfLowScores=@allResponses.select{| response | response.feedback_score<7}.sum

您可以试试这个

@sumOfHighScores = @allResponses.select{ |response| response.feedback_score > 8 }.map(&:feedback_score).sum
@sumOfLowScores = @allResponses.select{ |response| response.feedback_score < 7 }.map(&:feedback_score).sum

@sumOfHighScores=@allResponses.select{| response | response.feedback_scores>8}.map（&:feedback_scores）.sum
@sumOfLowScores=@allResponses.select{| response | response.feedback_score<7}.map（&:feedback_score）.sum

您可以试试这个

@sumOfHighScores = @allResponses.select{ |response| response.feedback_score > 8 }.map(&:feedback_score).sum
@sumOfLowScores = @allResponses.select{ |response| response.feedback_score < 7 }.map(&:feedback_score).sum

@sumOfHighScores=@allResponses.select{| response | response.feedback_scores>8}.map（&:feedback_scores）.sum
@sumOfLowScores=@allResponses.select{| response | response.feedback_score<7}.map（&:feedback_score）.sum

我将在数据库中执行整个计算

company = Company.find(current_user_company_id)
totals =  company.responses.sum(
            :feedback_score,
            :group => "CASE WHEN feedback_score < 7 THEN 'low' ELSE 'high' END")
low, high = (totals['low'] || 0), (totals['high'] || 0 )

company=company.find（当前用户公司id）
总计=company.responses.sum(
：反馈和分数，
：组=>“反馈时的案例（分数<7，然后为‘低’或‘高’端”）
低，高=（总计['low']| 0），（总计['high']| 0）

我将在数据库中执行整个计算

company = Company.find(current_user_company_id)
totals =  company.responses.sum(
            :feedback_score,
            :group => "CASE WHEN feedback_score < 7 THEN 'low' ELSE 'high' END")
low, high = (totals['low'] || 0), (totals['high'] || 0 )

company=company.find（当前用户公司id）
总计=company.responses.sum(
：反馈和分数，
：组=>“反馈时的案例（分数<7，然后为‘低’或‘高’端”）
低，高=（总计['low']| 0），（总计['high']| 0）

我选择你的，因为这样我就可以做额外的/不相关的数学，而无需再做另一个查询。我选择你的，因为这样我就可以做额外的/不相关的数学，而无需再做另一个查询。