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我是 Rails 初学者，我正在研究一个已有的 Rails 2 项目。在我的应用程序中，我尝试将选择下拉字段转换为 form_handler f.select，但出现此错误：

    undefined method `location.masterlocation.name

这是我的尝试：

    <% form_for @newsavedmap, :html=>{:id=>'createaMap'} do |f| %>

    <%= f.select(:start, options_from_collection_for_select(@itinerary.locations, "location.masterlocation.street_address, location.masterlocation.city, location.masterlocation.state, location.masterlocation.zip", "location.masterlocation.name"), :id => "startdrop")%>

这是原始的下拉字段：

    <select id="startdrop">
    <option value="">
    <% for location in @itinerary.locations %>
    <option value="<%= location.masterlocation.street_address %> <%= location.masterlocation.city %>, <%= location.masterlocation.state %>, <%= location.masterlocation.zip %>"><%= location.masterlocation.name %></option>
    <% end %>
    </select>

在此先感谢您的帮助！

编辑 1

使用这段代码，我离得更近了：

    <%= f.select :start, options_for_select(@itinerary.locations.map{ |c| [c.masterlocation.name, c.masterlocation.street_address]}),{}, :id=>"startdrop", :name=>"startthere" %>

问题是我想在值中包含城市、州和邮编，全部用逗号分隔。关于如何做到这一点的任何想法？

    <%= f.select :start, options_for_select(@itinerary.locations.map{ |c| [c.masterlocation.inst_name, c.masterlocation.street_address AND , AND c.masterlocation.city AND , AND c.masterlocation.state AND, AND c.masterlocation.zip]}),{}, :id=>"startdrop", :name=>"startthere" %>

这行得通！

地图助手：

    module MaptryHelper

def options_for_select(locations)
  locations.map do |location|
    [location.masterlocation.name, location_string(location.masterlocation)]
  end
end

def location_string(masterlocation)
  "#{masterlocation.street_address}, #{masterlocation.city}, #{masterlocation.state}, #{masterlocation.zip}"
end

    end

看法

    <%= f.select :start, options_for_select(@itinerary.locations),{}, :id=>"startdrop", :name=>"startthere" %>
4

1 回答 1

1

将以下内容放在帮助文件中

def select_options_for_locations(locations)
  locations.map do |location|
    [location_string(location.masterlocation), location.masterlocation.street_address]
  end
end

def location_string(masterlocation)
  "#{masterlocation.city}, #{masterlocation.state}, #{masterlocation.zip} #{masterlocation.name}"
end

然后在您看来，您可以使用以下内容

= f.select :start, select_options_for_locations(@itinerary.locations),  {}, :id => "startdrop"
于 2013-08-30T01:35:59.127 回答