init project

app/queries/admins/course_query.rb

@@ -0,0 +1,44 @@
+class Admins::CourseQuery < ApplicationQuery
+  include CustomSortable
+
+  attr_reader :params
+
+  sort_columns :created_at, default_by: :created_at, default_direction: :desc, default_table: 'courses'
+
+  def initialize(params)
+    @params = params
+  end
+
+  def call
+    courses = Course.all
+
+    courses = courses.where(id: params[:id]) if params[:id].present?
+
+    # 状态过滤
+    status =
+      case params[:status].to_s.strip
+      when 'processing'   then 0
+      when 'ended'  then 1
+      end
+    courses = courses.where(is_end: status) if status
+
+    # 单位
+    if params[:school_id].present?
+      courses = courses.where(school_id: params[:school_id])
+    end
+
+    # 首页展示
+    if params[:homepage_show].present? && params[:homepage_show].to_s == 'true'
+      courses = courses.where(homepage_show: true)
+    end
+
+    # 关键字
+    keyword = params[:keyword].to_s.strip
+    if keyword
+      sql = 'CONCAT(lastname, firstname) LIKE :keyword OR courses.name LIKE :keyword OR course_lists.name LIKE :keyword'
+      courses = courses.joins(:teacher, :course_list).where(sql, keyword: "%#{keyword}%")
+    end
+
+    custom_sort(courses, params[:sort_by], params[:sort_direction])
+  end
+end