Ruby on rails 将值从视图传递给辅助对象

我有以下表格：

projects
users
projects_users <- relational table

…这意味着“@project.id”或“current_user.id”为零。在本例中，我非常确定@project.id为零，并且它实际上没有传递给助手

如果我是对的，我如何将其传递给助手？ 如果我错了，有什么问题

视图：

1.  <% @projects.each do |project| %>
2.      <div class="project_container">
3.          <% if check_if_member %>
4.              <% if project.user_id == current_user.id %>
5.                  <div class="users_project label label-success">
6.                      Owner
7.                  </div>
8.              <% else %>
9.                  <div class="not_users_project label label-info">
10.                     Member
11.                 </div>
12.             <% end %>
13.             <div class="project_name_div">
14.                 <%= link_to (project.title), project_path(project) %><br />
15.             </div>
16.         <% else %>
17.             <div class="project_name_div">
18.                 project.title <br />
19.             </div>
20.         <% end %>
21.     </div>
22. <% end %>

module ProjectsHelper
    def check_if_member
        if ProjectsUser.where("project_id = ? AND user_id = ?", @project.id, current_user.id)
            return true
        else
            return false
        end
    end
end

明确通过

def check_if_member project, user
    ProjectsUser.where("project_id = ? AND user_id = ?", project.id, user.id).count > 0
end

然后

“为nil.调用id”是在您调用@variable.id且@variable为nil时生成的。这与调用variable.id且未定义变量时不同。

def check_if_member project, user
    ProjectsUser.where("project_id = ? AND user_id = ?", project.id, user.id).count > 0
end

<% if check_if_member(project, current_user) %>