Rails check_box_tag參數不會在第一次POST時出現，第二次在參數中可用

Question

帶RoR的新手，誰會瘋了！

當我勾選幾個check_boxes並點擊提交按鈕。選中的框（值數組）在Param中不可用。該頁面然後重定向回自己。當我再次做同樣的事情時（勾選幾個check_box並點擊Submit），然後複選框在params中可用，我可以保存它們。第一次出現什麼問題，我該如何解決。我在這裏做錯了什麼？

非常感謝！

<div class="row"> 
<div class="col-md-4"> 
<%= form_for(@user, url: registration_path(@user), html: { method: :put }) do |f| %> 
<%= devise_error_messages! %> 

<div class="field"> 
    <%= f.label :email %><br> 
    <p><%= f.email_field :email, autofocus: true %></p> 
</div> 

<!-- <% if devise_mapping.confirmable? && resource.pending_reconfirmation? %> 
    <div>Currently waiting confirmation for: <%= resource.unconfirmed_email %></div> 
<% end %> 

<div class="field"> 
    <%= f.label :password, "New password" %><br /> 
    <%= f.password_field :password, autocomplete: "off" %> 
</div> 

<div class="field"> 
    <%= f.label :password_confirmation, "New password confirmation" %><br /> 
    <%= f.password_field :password_confirmation, autocomplete: "off" %> 
</div> 

<div class="field"> 
    <%= f.label :current_password %> <i>(to confirm changes)</i><br /> 
    <%= f.password_field :current_password, autocomplete: "off" %> 
</div> --> 


<%= form_for (@user.musician) do |musician_form| %> 
    <%= musician_form.label "Naam" %> 
    <p><%= musician_form.text_field :name %></p> 

    <%= musician_form.label "Wat is je woonplaats?" %> 
    <p><%= musician_form.text_field :city %></p> 

    <%= musician_form.label "In welke Provincie woon je?" %><br> 
    <%= musician_form.select :province_id, Province.all.collect{|t| [t.description, t.id]}, { :include_blank => false } %><br><br> 

    <%= musician_form.label "Wat is je geboortedatum?" %> 
    <p><%= musician_form.date_select :birthday %></p> 

    <%= musician_form.label "Beschrijving" %><br> 
    <%= musician_form.text_area :description, class: "form-control", size: "40x5" %> 

<div class="actions"> 
    <br> 
    <%= f.submit "Wijzigingen opslaan", class: "btn btn-primary btn-xs" %> 
</div> 

<div class="col-md-4"> 
<b>Welk type muzikant ben je?</b><br><br> 

<% for musician_type in MusicianType.all %> 
    <div> 
    <%= check_box_tag "musician[musician_type_ids][]", musician_type.id, @user.musician.musician_types.include?(musician_type) %> 
    <%= musician_type.description %> 
    </div> 
<% end %> 

<br> 
<b>In welke genre(s) ben je geinteresseerd?</b><br><br> 
<% for genre in Genre.all %> 
    <div> 
    <%= check_box_tag "musician[genre_ids][]", genre.id, @user.musician.genres.include?(genre) %> 
    <%= genre.description %> 
    </div> 
    <% end %> 
<br> 

    <% end %> 
<% end %> 

<div class="col-md-4"> 
    <p>Niet tevreden? <%= button_to "Account verwijderen", registration_path(resource_name), data: { confirm: "Weet je zeker dat je je account en bijbehorende band(s) en vacature(s) wilt verwijderen? Het account kan niet meer worden teruggehaald!" }, method: :delete, class: "btn btn-danger btn-xs" %></p> 
</div> 

這裏是我的控制器代碼部分：

def edit 
@user = User.find(current_user.id) 
end 

def update 
    account_update_params =  devise_parameter_sanitizer.sanitize(:account_update) 
    @user = User.find(current_user.id) 

    params[:musician][:musician_type_ids] ||= [] 
    params[:musician][:genre_ids] ||= [] 

# unless params[:musician][:musician_type_ids].present? 
# params[:musician][:musician_type_ids] = [] 
# logger.info "DEBUG INFO: PARAM IS EMPTY #{@musician}" 
# end 
# 
# unless params[:musician][:genre_ids].present? 
# params[:musician][:genre_ids] = [] 
# end 

@musician = current_user.musician 
@musician.update(musician_params) 

if needs_password? 
    successfully_updated = @user.update_with_password(account_update_params) 
else 
    account_update_params.delete('password') 
    account_update_params.delete('password_confirmation') 
    account_update_params.delete('current_password') 
    successfully_updated = @user.update_attributes(account_update_params) 
end 

if successfully_updated 
    set_flash_message :notice, :updated 
    sign_in @user, :bypass => true 
    redirect_to edit_user_registration_path 
else 
    render 'edit' 
end 
end 

Answer 1

退房文檔在apidock：在評論

http://apidock.com/rails/ActionView/Helpers/FormTagHelper/check_box_tag

：

​​

因此，如果你想允許genre_ids你必須寫：

<%= check_box_tag "genre_ids[]", genre.id, @user.musician.genres.include?(genre) %>