Rails，MongoMapper在HAML中嵌套数组形成麻烦

我越来越

用于＃的未定义方法`胡萝卜’ （引用ln＃18）

尝试使用以下表单进行编辑时：

= form_for @harvest do |f| - if @harvest.errors.any? #error_explanation %h2= "#{pluralize(@harvest.errors.count, "error")} prohibited this harvest from being saved:" %ul - @harvest.errors.full_messages.each do |msg| %li= msg .field = f.label :created_at = f.text_field :created_at, :disabled => true %br = f.label :photo = f.text_field :photo %h2 Crops - @harvest.harvested_crops.each do |harvested_crop| = f.label :harvested_crop['crop'] = f.select harvested_crop['crop'], Crop.all.collect {|p| [ p.name, p.id ] }, {:include_blank => ''} = f.label :harvested_crop['amount'] = f.text_field harvested_crop['amount'] %br .actions = f.submit 'Save' 

使用以下数据：

 { "_id" : ObjectId("5067846f37bca62bccc3729e"), "user_id" : "5067844637bca62bccc3729c", "photo" : "carrotsnspuds.jpg", "harvested_crops" : [ { "crop" : "Carrots", "amount" : 1112.15 }, { "crop" : "Potatoes", "amount" : 3212.44 } ] } 

我已经尝试过针对MongoMapper，Rails和Embedded文档的相关Stack Overflow问题，但我没有任何运气，可能是因为这是一个嵌套数组而不是EmbeddedDocument。 我没有使用Formtastic或其他任何东西，只想先了解这里所需的语法。

Answer 1

这绝对没有效率，但这让我完成了工作：

 = form_for @harvest do |f| - if @harvest.errors.any? #error_explanation %h2= "#{pluralize(@harvest.errors.count, "error")} prohibited this harvest from being saved:" %ul - @harvest.errors.full_messages.each do |msg| %li= msg .field = f.label :created_at = f.text_field :created_at, :disabled => true %br = f.label :photo = f.text_field :photo %h2 Crops - x = 0 - @harvest.harvested_crops.each do |harvested_crop| = f.fields_for "harvested_crops[]", harvested_crop do |hc| %b Harvested Crop %select{:name => "harvest[harvested_crops][" + x.to_s + "][crop]"} - Crop.all.collect.each do |crop_name| - if harvested_crop['crop'] == crop_name[:name] %option{:selected => "selected", :value => crop_name[:name]} = crop_name[:name] - else %option{:value => crop_name[:name]} = crop_name[:name] %b Amount %input{:name => "harvest[harvested_crops][" + x.to_s + "][amount]", :value => harvested_crop['amount']}/ %br - x += 1 %br .actions = f.submit 'Save'