如何在formtastic中预先检查复选框 [英] How to pre-check checkboxes in formtastic

问题描述

我正在尝试设置一个表单...用户可以有很多帖子，每个帖子可以有很多人在看.

I have a form I'm trying to set up ... Users can have many posts, and each post can have many people watching it.

Watch 模型以多态方式设置为可观看"，因此它可以应用于不同类型的模型.它有一个 user_id、watchable_id、watchable_type 和时间戳作为属性/字段.

The Watch model is set up polymorphically as 'watchable' so it can apply to different types of models. It has a user_id, watchable_id, watchable_type and timestamps as attributes/fields.

这只是为了当人们对帖子发表评论时，观看帖子的用户可以收到一封关于它的电子邮件.

This is soley so that when people comment on a post, users watching the post can get an email about it.

我想做的是向用户显示他们可以在每个帖子上标记的用户列表，这没有问题.这是我现在用的

What I'm trying to do is show the user a list of users that they can tag on each post, which is not problem. This is what I'm using right now

http://pastie.org/940421

<% semantic_form_for @update do |f| %>
      <%= f.input :subject, :input_html => { :class => 'short' } %>
      <%= f.input :site, :include_blank => false, :input_html => { :class => 'short' } %>
      <label>Tag Users (they will get notified of this update)</label>
       <%= f.input :user, :as => :check_boxes, :label => '&nbsp;', :wrapper_html => { :class => "radiolist clearfix" }, :for => :watch, :name => "Watch" %>

      <%= f.input :note, :label => 'Update'%>
      <% f.buttons do %>
        <%= f.commit_button :button_html => { :class => 'submit' } %>
      <% end %>
    <% end %>

这个问题是，当你去编辑更新/帖子时......所有复选框都被预先选中......我希望它只预先检查当前正在观看帖子的用户.

The problem with this, is that when you go to edit an update/post ... all the checkboxes are prechecked ... I want it to pre-check only users who are currently watching the post.

进一步澄清......这是我现在让它做我想做的事情的hacky方式

To further clarify ... this is the hacky way I'm getting it to do what I want right now

<ul class="radiolist clearfix">
<% @users.each do |user| %>
    <li>
    <%= check_box_tag 'user_ids[]', user.id, @watches.include?(user.id) ? true : false -%>
    <%= h user.name -%>
    </li>
<% end %>
</ul>

@watches 只是一个用户 ID 数组

where @watches is just an array of user ids

@watches = @update.watches.map{|watcher| watcher.user_id}

推荐答案

对于有同样问题的其他人:

For anyone else having the same issue:

<%= f.input :some_input, :as => :boolean, :input_html => { :checked => 'checked' } %>

这篇关于如何在formtastic中预先检查复选框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！