部分sql语句写成rails形式

app/helpers/welcome_helper.rb

@@ -159,11 +159,12 @@ module WelcomeHelper
   end
 
   def sort_project_by_hot_rails project_type=0, order_by='grade DESC', limit=15
-    Project.find_by_sql("
-			SELECT p.id, p.name, p.description, p.identifier, t.project_id
-			FROM projects AS p RIGHT OUTER JOIN (
-				SELECT project_id,grade FROM project_statuses
-				WHERE project_type = #{project_type} ORDER BY #{order_by} LIMIT #{limit} ) AS t ON p.id = t.project_id ")
+   #  Project.find_by_sql("
+			# SELECT p.id, p.name, p.description, p.identifier, t.project_id
+			# FROM projects AS p RIGHT OUTER JOIN (
+			# 	SELECT project_id,grade FROM project_statuses
+			# 	WHERE project_type = #{project_type} ORDER BY #{order_by} LIMIT #{limit} ) AS t ON p.id = t.project_id ")
+    Project.joins(:project_status).where("#{Project.table_name}.project_type = ?", project_type).order(order_by).limit(limit).all
   end
 
   def sort_bid_by_hot_rails reward_type, limit = 10

app/views/welcome/index.html.erb

@@ -292,13 +292,13 @@
 		    </div>
 		  	<div style="float: left; margin-left: 10px; width: 360px;">
     	      <p class="layout">
-         	    <span style="display: inline-block; width: 250px;"><%= link_to( project.name, project_path(project.project_id), :class => "d-g-blue d-p-project-name",  :title => "#{project.name}")%></span>
-         	    <!-- <span style="cursor: help; display: inline-block; float: right; color: #ec6300; background: url('/images/score.png') no-repeat scroll ;background-position: left center;" title="项目得分，综合考虑了项目的各项活动，反映了该项目的活跃程度"  class="tooltip-#{project.project_id}"><%= show_grade project %></span> -->
+         	    <span style="display: inline-block; width: 250px;"><%= link_to( project.name, project_path(project.id), :class => "d-g-blue d-p-project-name",  :title => "#{project.name}")%></span>
+         	    <!-- <span style="cursor: help; display: inline-block; float: right; color: #ec6300; background: url('/images/score.png') no-repeat scroll ;background-position: left center;" title="项目得分，综合考虑了项目的各项活动，反映了该项目的活跃程度"  class="tooltip-#{project.id}"><%= show_grade project %></span> -->
          	    <%= content_tag "span", show_grade(project), 
          	        :style => "cursor: pointer; display: inline-block; float: right; color: #ec6300; ",
 			        :title => "项目得分，综合考虑了项目的各项活动，反映了该项目的活跃程度",
 			        :class => "tooltip",
-			        :id => "tooltip-#{project.project_id}" %>
+			        :id => "tooltip-#{project.id}" %>
 		      </p>
     	      <p class="layout-1" >
 			    <%= content_tag "span", project.description.truncate(50, omission: '...'), :class => "d-p-project-intro" , :title => project.description %>
@@ -326,7 +326,7 @@
 		        </div>
 		        <div style="float: left; margin-left: 10px; width: 360px;">
 				<p class="layout">
-					<%= link_to( project.name, project_path(project.project_id), :class => "d-g-blue d-p-project-name",:title => "#{project.name}")%>
+					<%= link_to( project.name, project_path(project.id), :class => "d-g-blue d-p-project-name",:title => "#{project.name}")%>
 					<span style="cursor: pointer; display: inline-block; float: right; color: #ec6300; white-space: nowrap;">学生人数：<%= link_to "#{studentCount(project)}", project_member_path(project, :role => 2) ,:course =>'1'%></span>
 				</p>
 				<p class="layout-1" >