ruby-on-rails - 如何用茧自动渲染一个关联

Question

我有使用嵌套表单的茧，如果您单击添加字段链接，它会插入输入字段。如何自动呈现第一个输入，然后在单击“添加字段”时插入其他输入？

Answer 1

在您的控制器中，使用此代码。在下面的代码中，jobs 是一个模型，并且配置文件接受_nested_attributes_for 作业。将 @profile 替换为您的表单的用途。第二行是构建表单域的内容，除非表单域已经存在。

def new
    @profile = current_user.profile
    1.times {@profile.jobs.build} unless current_user.profile.jobs.any?
end

自单数以来，您可能需要不时更改。实际上，您也许可以完全摆脱 times 方法并执行以下操作：

def new
    @profile = current_user.profile
    @profile.jobs.build unless current_user.profile.jobs.any?
end

Answer 2

The quick and dirty solution is to just use jQuery (which Cocoon requires anyways) to click Cocoon's "add item" button when the page loads:

$(document).ready(function() { $(".add_fields").click() } );

I use this in my "new" views, but not in "edit" views, since there may already be some nested items and I don't want to make assumptions. But you could also use script to count the nested item forms and conditionally show the "new item" fields.