爲什麼rails服務器發送GET請求，並且我爲form_for放了一個POST請求？

Question

//sessions controller

def welcome 
    @user = User.new 
    end 

    def create 
    user = User.find_by_username(params[:username]) 
    if user.authenticate(params[:password]) 
     session[:user_id] = user.id 
     redirect_to root_path 
    else 
     redirect_to user_login_path 
    end 
    end 

//view this one doesn't work it sends a GET request

<%= form_for @user, url: create_user_session_url do |f| %> 
    <div class="form_group"> 
     <%= f.text_field :username, placeholder: "Username", class: "form-control" %> 
    </div> 
    <div class="form_group"> 
     <%= f.password_field :password, placeholder: "Password", class: "form-control" %> 
    </div> 
    <div class="form-group"> 
     <%= f.submit "Login", class: "form-control" %> 
    </div> 
    <% end %> 

//view one works and successfully sends POST request

<%= form_for @user, url: create_user_registration_url do |f| %> 
    <div class="form_group"> 
     <%= f.text_field :username, placeholder: "Username", class: "form-control" %> 
    </div> 
    <div class="form_group"> 
     <%= f.email_field :email, placeholder: "Email", class: "form-control" %> 
    </div> 
    <div class="form_group"> 
     <%= f.password_field :password, placeholder: "Password", class: "form-control" %> 
    </div> 
    <div class="form_group"> 
     <%= password_field_tag "confirm_password", nil, placeholder: "Confirm Password", class: "form-control" %> 
    </div> 
    <div class="form-group"> 
     <%= f.submit "Sign Up", class: "form-control" %> 
    </div> 
    <% end %> 

這是我的形式，當我做耙分貝：在控制檯路線，create_user_session明確表示其職位。

    Prefix Verb URI Pattern    Controller#Action 
        root GET /      application#index 
create_user_registration POST /user/login(.:format) user/registrations#create 
destroy_user_registration DELETE /user(.:format)   user/registrations#destroy 
     user_registration GET /user(.:format)   user/registrations#show 
          PATCH /user(.:format)   user/registrations#update 
          PUT /user(.:format)   user/registrations#update 
     new_user_session GET /user/welcome(.:format) user/sessions#welcome 
     create_user_session POST /user/session(.:format) user/sessions#create 
    destroy_user_session DELETE /user/logout(.:format) user/sessions#destroy 

但是，我愚蠢的服務器認爲它發送GET要求，Started GET "/user/welcome"我真的很困惑，因爲我有相同的語法的另一種形式，它成功地發送一個POST請求。我甚至沒有得到任何錯誤，所以很難調試。

只是櫃面我並不清楚，我的服務器甚至沒有嘗試發送POST請求。

Answer 1

指定動作類型是這樣的：

<%= form_for @user, url: create_user_session_url, method: :post do |f| %>