Question

型号：project.rb

def groups_by_role
    member_principals.find(:all, :include => [:principal, :roles]).inject({}) do |h, m|
      m.roles.each do |r|
        h[r] ||= []
        h[r] << m.principal
      end
      h
    end
  end

Controller：projects_controller.rb

@groups_by_role = @project.groups_by_role

观看次数：members_index.html.rb

<% if @groups_by_role.any? %>
<div class="members box">
    <h3><%= l(:label_member_plural)%></h3>
    <p>
        <% @groups_by_role.keys.sort.each do |role| %>
        <%= h role %>: <%= @groups_by_role[role].sort.collect{|u| u}.join(", ").html_safe %>
        <br />
        <% end %>
    </p>
</div>
<% end %>

我有一个模型，它有一个方法group_by_role，可以找到所有的角色和主体。这里，principal定义了属于特定角色的用户和组。此方法是project.rb。

的一部分

后来，我在控制器中为项目定义了相同的方法，并将其分配给实例变量，以供视图使用，即@groups_by_role。

最后，收集并显示特定用户和组的角色。

控制台对特定@project的输出如下所示：@groups_by_role

{#<Role id: 18, name: "Project Manager", permissions: [:add_project, :edit_project, :close_project], issues_visibility: "all">=>[#<User id: 11, login: "test1", firstname: "Test", lastname: "T", type: "User">], 

#<Role id: 26, name: "Readers", permissions: [:view_documents, :view_files], issues_visibility: "default">=>[#<Group id: 835, login: "", firstname: "", lastname: "AA", type: "Group">, #<User id: 107, login: "testab", firstname: "Tommy", lastname: "Ab", type: "User">, #<User id: 111, login: "testxyz", hashed_password: "", firstname: "test", lastname: "xyz", type: "User">]}

@ groups_by_role.class = Hash

问题：现在我将获得带有角色的输出以及相应的用户或组。但我想在这里更改显示。如果哈希只包含没有任何组的用户，那么我只显示用户。因此对于此输出{#<Role id: 18, name: "Project Manager", permissions: [:add_project, :edit_project, :close_project], issues_visibility: "all">=>[#<User id: 11, login: "test1", firstname: "Test", lastname: "T", type: "User">], 因为它只有用户，所以我显示用户。这很好，因为它只有用户而不是组......

但如果哈希中同时存在用户和组，那么我只显示组名而不显示用户。目前它显示的用户和组如下例所示：#<Role id: 26, name: "Readers", permissions: [:view_documents, :view_files], issues_visibility: "default">=>[#<Group id: 835, login: "", firstname: "", lastname: "AA", *type: "Group"*>, #<User id: 107, login: "testab", firstname: "Tommy", lastname: "Ab", *type: "User"*>, #<User id: 111, login: "testxyz", hashed_password: "", firstname: "test", lastname: "xyz", type: "User">]}

是否有任何方法可以在视图或控制器中传递条件，并检查哈希是否同时返回用户和组，然后只显示该组。有人可以帮助我。任何帮助将非常感激。

Answer 1

我希望我能正确理解你。

创建一个辅助方法（用于控制器），它将返回一个如下字符串：

def print_principals(principals)
  if principals.index {|p| p.is_a? Group }
    principals = principals.reject{|u| u.is_a? User }
  end
  # WARNING!!! You should apply html_safe only if you're sure that it 
  # is actually safe, i.e. not input by user. Otherwise consider escaping it.
  principals.sort.collect{|u| u}.join(", ").html_safe 
end

在您看来： <%= h role %>: <%= print_principals @groups_by_role[role] %>

收集有条件的哈希

1 个答案: