[英]Ruby on Rails query more than one fields
在我的Rails应用程序中,如何查询数据库中的多个字段? 当前,当用户基于关键字搜索产品时,该查询仅从db获取name
字段:
@products = @products.where("lower(name) LIKE ?", "%#{params[:search_free_text].downcase}%")
我需要在查询中包括, description
和highlight
两种文本格式。 谢谢!!
可以使用以下SQL来完成:
@products = @products.where(
%w( name description highlight ).map { |column_name|
"lower(#{column_name}) LIKE :query"
}.join(' OR '),
query: "%#{params[:search_free_text].downcase}%")
我会说使用范围是值得的:
# in your app/models/product.rb
FULLTEXT_COLUMNS = %w( name description highlight )
scope :search, lambda { |query|
where(
FULLTEXT_COLUMNS.map { |c| "lower(#{c}) LIKE :query" }.join(' OR '),
query: "%#{query.downcase}%"
)
}
# in your controller:
@products = @products.search(params[:search_free_text])
您只需要遵循SQL
格式即可:
@products = @products.where("lower(name) LIKE :query OR description LIKE :query", query: "%#{params[:search_free_text].downcase}%")
尝试在模型Product
中建立范围
class Product < ActiveRecord::Base
scope :search_ndh, -> (name_text, desc_text, highlight_text){where("lower(name) LIKE :name OR description LIKE :desc OR highlight LIKE :high", name: "%#{name_text.downcase}%", desc: "%#{desc_text}%", high: "%#{highlight_text}%")}
end
现在使用范围
@products.search_ndh(params[:search_free_text].downcase, params[:search_description_text], params[:search_highlight_text])
或Arel方式
products = Product.arel_table
Product.where(products[:name].matches("%#{params[:search_free_text]}%").or(products[:description].matches("%#{params[:search_description_text]}%")).or(products[:highlight].matches("%#{params[:search_highlight_text]}%")))
或范围内的动态字段
class Product < ActiveRecord::Base
SEARCH_COLUMNS = [:name, :description, :highlight]
scope :search, lambda{ |q| where(SEARCH_COLUMNS.map{|c| self.arel_table[c].matches("%#{q}%").to_sql}.join(' OR '))}
end
接着
Product.search(params[:search_text])
它会产生
Product.search("das")
SELECT "products".* FROM "products" WHERE ("products"."name" LIKE '%das%' OR "products"."description" LIKE '%das%' OR "products"."highlight" LIKE '%das%')
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