ruby-on-rails - Find ID 没有找到 id 并创建

Question

我有两个要在创建操作之前使用的视图。

第一个视图是 add_sample_details.html.erb

<% form_tag add_expt_details_samples_path :method => :post do %>
    <% for sample in @samples %>
        <% fields_for "samples[]", sample do |form| %>
            <fieldset>
                <legend>Sample Name: <%= sample.name %></legend>
                <p><center><%= form.label :sample_title %>
                <%= form.text_field :sample_title, :size => 25 %></center></p>
                <table>
                    <tr>
                        <td>
                            <%= form.label :taxon_id %>
                            <%= form.text_field :taxon_id, :size => 15 %>
                        </td>
                        <td>
                            <%= form.label :scientific_name %>
                            <%= form.text_field :scientific_name, :size => 20 %>
                        </td>
                        <td>
                            <%= form.label :common_name %>
                            <%= form.text_field :common_name, :size => 15 %>
                        </td>
                    </tr>
                </table>
                <p>
                    <center>
                        <%= form.label :sample_descripition %><br \>
                        <%= form.text_area :description %>
                    </center>
                </p>
            </fieldset>
        <% end %>
    <% end %>
    <p><center><%= submit_tag "Next" %></center></p>

    <% for samp in @samples %>
        <%= hidden_field_tag("sample_ids[]", samp.id) %>
    <% end %>   
<% end %>

在 SamplesController 中，add_expt_details 看起来像这样

def add_expt_details
    # Collect the samples that were sent
    @expt_samples = Sample.find(params[:sample_ids])
  end

add_expt_details.html.erb 看起来像这样

<% form_for @expt_samples, :url => create_study_samples_path, :html => { :method => :put }  do |f| %>
    <% @expt_samples.each do |samp|%>
        <% f.fields_for :expts do |form| %>
        <%= form.label :experiment_title  %>
        <%= form.text_field :expt_title, :size => 15 %><br \>
        <% end %>
    <% end %>
    <p><center><%= submit_tag "Next" %></center></p>
<% end %>

我的 create_study 动作是这样的

def create_study
     @study = Study.new(params[:study])
     # this method collects all the samples from the add_sra_details view from the hidden_field_tag   
     if current_user.id?
       # Put the current user_id in the study.user_id
        @study.user_id = current_user.id       
       if @study.save # Save the values for the study  
          # Update the Sample attributes 
          @samples = Sample.update(params[:samples].keys, params[:samples].values).reject { |p| p.errors.empty? }
           # For all those sample_ids selected by the user, put the study ids in the sample_study_id
           @samples.each do |samp|     
             @study.samples << samp        
           end       

           # get the ids_sent from the add_expt_details
            @expt_samples = Sample.find(params[:id])             

           # A Flash message stating the details would be prefereable..! (Means you have to do it)
           flash[:success] = "Your Study has been Created"           
           redirect_to add_expt_details_samples_path
       else
           flash[:error] = "Study Faulty" 
           render :action => "add_sra_details"
       end
     end
  end

当我保留@expt_samples = Sample.find(params[:id]) 时收到的错误消息是“nil:NilClass 的未定义方法‘键’”

如果我没有@expt_samples，它会给我一个错误“Couldn't Find id in Sample”

有人可以建议我如何从一个表单更新一组样本 ID，并创建新的 Expt 模型记录，这些记录与另一种表单的 sample_ids 相关联。

所有建议表示赞赏。

干杯