Rails file_field不上传任何内容

Question

I am using Rails 4 and Ruby 2 with Carrier Wave along with jQuery Mobile 1.3, and a user has a profile which has a logo. I have tested the backend Carrier Wave stuff in the console and it works.

The problem is in the form helper, it doesn't matter what I do, but a file_field will display and let me choose an image, but it does not come through in the params. If I change it to a field that does not exist eg. =f.file_field :field_not_permitted_in_strong_params it does not fall over and a file picker is visible, if I change that to =f.text_field :field_not_permitted_in_strong_params , only then does rails kick in and complain about the field not existing.

So my problem is basically, I can upload a file client side, but it does not get sent through in the form data, or appear in the params hash, and all my other fields work correctly.

Here is a snippet of the form:

= form_for(@business_profile, :html => {:multipart => true}, :url => business_profile_path, :validate => true) do |f|

    =image_tag(@business_profile.logo.url, class: 'business-logo')
    %div{:data => {:role => 'fieldcontain'}}
        =f.file_field :logo

    - # Basic Information
    %div{:data => {:role => 'collapsible', :collapsed => 'false'}}
        %h3
            Basic Information                 
        %div{:data => {:role => 'fieldcontain'}}
            = f.label :name, 'Business name:' 
            = f.text_field :name
        %div{:data => {:role => 'fieldcontain'}}
            = f.label :address, 'Address:'
        = f.text_area :address, class: 'address'

Answer 1

在花了数小时的时间后，问题就解决了，问题在于jQuery Mobile默认使用Ajax提交表单，并且不使用插件等就无法使用Ajax提交文件。因此，解决方案是禁用Ajax，如下所示：

= form_for(@business_profile, :url => business_profile_path, :validate => true, :html => { :'data-ajax' => false }) do |f|