使用 OR 和 AND 搜索查询多列以应用过滤器

Question

我正在开发一个应用程序。我试图植入一个搜索系统。方法很简单。在家里，我在 3 列“名称”或“nomdep”或“nomregion”上搜索查询。在此之后，我想使用 AND 运算符按参数进行过滤。

如果我只使用一列（例如“NAME”）植入搜索，我可以应用过滤器。但是，如果我想用一个以上的 OR 植入它，我就不能应用过滤器。我认为 OR 运算符是问题所在。但可以肯定的是，我不知道如何解决这个问题......

你能帮帮我吗？谢谢

露营.rb

has_many :caracteristiquetests, :foreign_key => :camping_id
has_many :situations, :foreign_key => :camping_id

    def self.searchi(query, handicap, animaux, television, plage, etang, lac)
       return scoped unless query.present?
       left_outer_joins(:caracteristiquetests, :situations).where(['nomdep LIKE ? OR name LIKE ? OR nomregion LIKE ? AND handicap LIKE ? AND animaux LIKE ? AND television LIKE ? AND plage LIKE ? AND etang LIKE ? AND lac LIKE ?', "%#{query}%", "%#{query}%", "%#{query}%", "%#{handicap}%", "%#{animaux}%", "%#{television}%", "%#{plage}%", "%#{etang}%", "%#{lac}%"])
    end

camping_controller.rb

      def resultnohome
        if params[:query].blank?
          redirect_to action: :index and return
        else
          @campings = Camping.searchi(params[:query], params[:handicap], params[:animaux], params[:television], params[:plage], params[:etang], params[:lac])
        end
end

性格测试.rb

belongs_to :camping

情况.rb

belongs_to :camping

编辑

我编辑了我的模型以添加“()”

露营.rb

def self.searchi(query, handicap, animaux, television, plage, etang, lac)
   return scoped unless query.present?
   left_outer_joins(:caracteristiquetests, :situations).where(['(nomdep LIKE ? OR name LIKE ? OR nomregion LIKE ?) AND handicap LIKE ? AND animaux LIKE ? AND television LIKE ? AND plage LIKE ? AND etang LIKE ? AND lac LIKE ?', "%#{query}%", "%#{query}%", "%#{query}%", "%#{handicap}%", "%#{animaux}%", "%#{television}%", "%#{plage}%", "%#{etang}%", "%#{lac}%"])
end

不幸的是，我得到了意想不到的结果：只显示一个结果，第一个匹配项如“短路评估”。任何想法为什么？

Answer 1

只需在or 条件周围使用括号，or 条件的结果将与and 条件组合。

left_outer_joins(:caracteristiquetests, :situations).where(['(nomdep LIKE ? OR name LIKE ? OR nomregion LIKE ?) AND handicap LIKE ? AND animaux LIKE ? AND television LIKE ? AND plage LIKE ? AND etang LIKE ? AND lac LIKE ?', "%#{query}%", "%#{query}%", "%#{query}%", "%#{handicap}%", "%#{animaux}%", "%#{television}%", "%#{plage}%", "%#{etang}%", "%#{lac}%"])

或者，您可以将其拆分为单独的where 语句，当您检索结果时，这些语句将合并为一个 SQL 调用。这将更易于阅读和维护，并且不会在未提供值的情况下进行任何调用。

result = left_outer_joins(:caracteristiquetests, :situations).where('nomdep LIKE ? OR name LIKE ? OR nomregion LIKE ?', "%#{query}%", "%#{query}%", "%#{query}%")
result = result.where('handicap LIKE ?', "%#{handicap}%") if handicap
result = result.where('animaux LIKE ?', "%#{animaux}%") if animaux
result = result.where('television LIKE ?', "%#{television}%") if television
result = result.where('plage LIKE ?', "%#{plage}%") if plage
result = result.where('etang LIKE ?', "%#{etang}%") if etange
result = result.where('lac LIKE ?', "%#{lac}%") if lac
return result