Rails查询界面where子句问题？答案

【问题标题】：Rails query interface where clause issue?Rails查询界面where子句问题？
【发布时间】：2013-05-16 04:52:12
【问题描述】：

我尝试如下运行 SQK 查询

@applicants = Applicant.where("applicants.first_name LIKE ? AND applicants.status = ?", "%#{people}%", ["new", "in-review"] )

我收到一个 MySQL 错误：

ActionView::Template::Error (Mysql2::Error: Operand should contain 1 column(s): SELECT `applicants`.* FROM `applicants`  WHERE (applicants.first_name LIKE '%sh%' AND applicants.status = 'new','in-review')):

【问题讨论】：

标签： mysql ruby-on-rails ruby-on-rails-3 activerecord

【解决方案1】：

如果你想传递一个数组，最好写成

@applicants = Applicant
    .where("applicants.first_name LIKE ?", "%#{people}%")
    .where(status: ["new", "in-review"])

或使用squeel gem。

@applicants = Applicant.where{ (status.in(["new", "in-review"]) & (first_name =~ "%#{people}%") }

【讨论】：

你能帮我解决这个问题吗？点击链接 pastebin.com/2vup4PWD
您不能使用面向对象的表示法申请人.job.job_title，因为据我了解，job_title 是工作表的一列。您需要加入工作表。 guides.rubyonrails.org/…

【解决方案2】：

你必须使用mysql的IN子句

@applicants = Applicant.where("applicants.first_name LIKE ? AND 
                               applicants.status in (?)", 
                               "%#{people}%", ["new", "in-review"] )

【讨论】：

@applicants = Apply.includes(:jobs).where("applicants.first_name LIKE ? AND Candidates.location LIKE ? AND jobs.job_title LIKE ?", "%#{people}%", "%#{location}%", "%#{more_job}%")
谢谢，它对我有用，但有一点改变。我使用了includes(:job)而不是includes(:jobs)