gem ransack 的一些搜索条件

gem ransack详细介绍

html:

<%= form_for @query, :url => articles_path, :html => {:method => :get, :class => "well form-search fr"} do |f| %> # url = 需要传入的控制器和方法
        采购单位：<%= text_field_tag "q[auction_project_department_name_cont]", params[:q][:auction_project_department_name_cont], class: "string", placeholder: "采购单位" %>
# name 是属于 department表的字段 department是属于auction_project表的 （控制器中需要添加嵌套查询） 
        项目编号：<%= text_field_tag "q[auction_project_code_cont]", params[:q][:auction_project_code_cont], class: "string", placeholder: "项目编号" %>
# code 是属于 auction_project表的字段（控制器中不需要添加嵌套查询） 
        查 询
    <% end %>

控制器：

    @query = Article.select_filed.published.where(category_id: ids).includes(:auction_project, auction_project: [:department]).ransack(params[:q])
# includes(预加载）对一级关联表的写法是:auction_project   
                 对二级关联表的写法是: auction_project: [:department]   （department为二级关联表）

eq: "等于"
eq_any: "等于任意值"
eq_all: "等于所有值"
not_eq: "不等于"
not_eq_any: "不等于任意值"
not_eq_all: "不等于所有值"
matches: "符合"
matches_any: "符合任意条件"
matches_all: "符合所有条件"
does_not_match: "不符合"
does_not_match_any: "符合任意条件"
does_not_match_all: "不符合所有条件"
lt: "小于"
lt_any: "小于任意一个值"
lt_all: "小于所有值"
lteq: "小于等于"
lteq_any: "小于等于任意一个值"
lteq_all: "小于等于所有值"
gt: "大于"
gt_any: "大于任意一个值"
gt_all: "大于所有值"
gteq: "大于等于"
gteq_any: "大于等于任意一个值"
gteq_all: "大于等于所有值"
in: "被包含"
in_any: "被任意值包含"
in_all: "被所有值包含"
not_in: "不被包含"
not_in_any: "不被任意值包含"
not_in_all: "不被所有值包含"
cont: "包含"
cont_any: "包含任意一个值"
cont_all: "包含所有值"
not_cont: "不包含"
not_cont_any: "不包含任意一个值"
not_cont_all: "不包含所有值"
start: "以改值开始"
start_any: "以任意一个值开始"
start_all: "以所有值开始"
not_start: "不以改值开始"
not_start_any: "不以任意一个值开始"
not_start_all: "不以所有值开始"
end: "以改值结尾"
end_any: "以任意一个值结尾"
end_all: "以所有值结尾"
not_end: "不以改值结尾"
not_end_any: "不以任意一个值结尾"
not_end_all: "不以所有值结尾"
'true': "等于true"
'false': "等于false"
present: "有值"
blank: "为空"
'null': "是null"
not_null: "不是null"