Question

我在Messages＃new中收到了ArgumentError app / views / messages / new.html.erb第16行引发： “错误的参数数量（2对1）” 它还说：

app / helpers / application_helper.rb：8：在recipients_options中的avatar_url' app/helpers/messages_helper.rb:5:in块中 app / helpers / messages_helper.rb：4：{_ 1}}块中的_app_views_messages_new_html_erb___264831154_80406348' app / views / messages / new.html.erb：3：in`_app_views_messages_new_html_erb ___ 264831154_80406348'

我的申请助手：

recipients_options'
app/views/messages/new.html.erb:16:in

我的消息助手是，

module ApplicationHelper

def page_header(text)
    content_for(:page_header) { text.to_s }
end


def avatar_url(user)
    if user.image
        user.image
    else
        "/images/missing.png"
    end
end
end

我的消息/ new.html.erb是，

module MessagesHelper


def recipients_options(chosen_recipient = nil)
    s = ''
    User.all.each do |user|
      s << "<option value='#{user.id}' data-img-src='#{image_tag avatar_url(user.email, size: 50)}' #{'selected' if user == chosen_recipient}>#{user.name}</option>"
    end
    s.html_safe
  end
end

messages_controller.rb

<% page_header "Start Conversation" %>

<%= form_tag messages_path, method: :post do %>
  <div class="form-group">
    <%= label_tag 'message[subject]', 'Subject' %>
    <%= text_field_tag 'message[subject]', nil, class: 'form-control', required: true %>
  </div>

  <div class="form-group">
    <%= label_tag 'message[body]', 'Message' %>
    <%= text_area_tag 'message[body]', nil, cols: 3, class: 'form-control', required: true %>
  </div>

  <div class="form-group">
    <%= label_tag 'recipients', 'Choose recipients' %>
    <%= select_tag 'recipients', recipients_options(@chosen_recipient), multiple: true, class: 'form-control chosen-it' %>
  </div>

  <%= submit_tag 'Send', class: 'btn btn-primary' %>
<% end %>

Answer 1

在#{image_tag avatar_url(user.email, size: 50)}下，您传递了两个参数，但def avatar_url(user)只接受一个参数。

Answer 2

您定义了avatar_url，其中包含一个参数，但您正在传递两个参数

avatar_url(user.email, size: 50)

错误：消息中的ArgumentError #new错误的参数个数（2个用于1）

2 个答案: