关于rails上的ruby：注册时未定义的方法错误

Undefined method error on signup

我有一个表'用户'有各种列。其中一列是用户名。我决定通过迁移删除该列。在这样做之后，我尝试通过注册表单创建一个新用户(创建操作)但是我收到了用户名的未定义方法错误，我不知道为什么。错误被@ user.save抛出。

以下是相关代码，首先是用户控制器的操作，然后是提交的实际表单。

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def user_params
params.require(:user).permit(:name, :email, :password, :password_confirmation)
end

def create
@user = User.new(user_params)
if @user.save
session[:user_id] = @user.id
redirect_to @user, notice: 'Thank you for registering!'
else
render :new
end
end

<%= form_for(@user) do |f| %>
<%= render"shared/errors", object: @user %>
<fieldset>

<li class="required">
<%= f.label :name %>
<%= f.text_field :name, size: 40, autofocus: true %>

</li>

<li class="required">
<%= f.label :email %>
<%= f.email_field :email, size: 40 %>

</li>

<li class="required">
<%= f.label :password %>
<%= f.password_field :password, size: 40 %>

</li>

<li class="required">
<%= f.label :password_confirmation,"Confirm Password" %>
<%= f.password_field :password_confirmation, size: 40 %>

</li>

<p>

<% if @user.new_record? %>
<%= f.submit"Create Account" %>
<% else %>
<%= f.submit"Update Account" %>
<% end %>

</p>
</fieldset>
<% end %>

有什么想法吗？堆栈跟踪，根据要求：

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activemodel(4.0.5)lib / active_model / validator.rb：150：in validate'
activerecord (4.0.5) lib/active_record/validations/presence.rb:5:in validate'
activesupport(4.0.5)lib / active_support / callbacks.rb:283:in _callback_before_609'
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activemodel (4.0.5) lib/active_model/validations.rb:373:in run_validations！'
activemodel(4.0.5)lib / active_model / validations / callbacks.rb：106：in block in run_validations!'
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activerecord(4.0.5)lib / active_record / validations.rb:77:in perform_validations'
activerecord (4.0.5) lib/active_record/validations.rb:51:in save'
activerecord(4.0.5)lib / active_record / attribute_methods / dirty.rb:32:in save'
activerecord (4.0.5) lib/active_record/transactions.rb:270:in block(2级)in save'
activerecord(4.0.5)lib / active_record / transactions.rb：330：在事务中的block in with_transaction_returning_status'
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activerecord(4.0.5)lib / active_record / transactions.rb：269：in save'
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