如何链接2个表的数据?

时间:2013-07-15 15:06:31

标签: ruby-on-rails

我有两张表,发电机和结果。

生成器has_many结果 结果belongs_to generator

我怎样才能有一个页面,我可以显示生成器的所有值和结果?在我的Result Controller中,创建必须链接Generator_id吗?我试过但是当我试图创建属于该生成器的新结果时,它会给我一个错误。

例如localhost:3000 / generator / 3 / results / new,点击创建后,它会出现以下错误:

Couldn't find Generator without an ID .

我收到的一些建议要求我创建一个新的控制器。如果是这样,我应该如何将@generator和@result传递给它?

GeneratorController

def index
    @generators = Generator.all(:include => [:results])
  end

def create    
    @generator = Generator.new(generator_params)
    @generator.choice = params[:choice]
      if params[:choice] == 'Randomly'
          @generator.random_generate(generator_params)
      elsif params[:choice] == 'No_of_ATGC'
          @generator.no_ATGC(params[:no_A],params[:no_T],params[:no_G],params[:no_C])
      elsif params[:choice] == 'Seating'
          @generator.seating(params[:user_seq])
      end

    @generator.result_choice=params[:result_choice]
    respond_to do |format|
      if @generator.save
          if @generator.result_choice == 'Yes'
            format.html { redirect_to(new_generator_result_path(@generator)) }
          else
            format.html { redirect_to @generator, notice: 'Result was successfully created.' }
            format.json { render action: 'show', status: :created, location: @generator }
          end
      else 
        format.html { render action: 'new' }
        format.json { render json: @generator.errors, status: :unprocessable_entity }
      end
    end
  end

结果模型

class Result < ActiveRecord::Base
   attr_accessible :ncbi_ref_seq,:genome_seq, :genome_sample
   belongs_to :generator, foreign_key: "generator_id"

    def generate_result(result_params)
    ref_seq = self.ncbi_ref_seq
    Bio::NCBI.default_email = "spykix@hotmail.com"
    fasta_sequence = Bio::NCBI::REST::EFetch.nucleotide(ref_seq,"fasta")
    fasta=Bio::FastaFormat.new(fasta_sequence)
    self.genome_seq = fasta.data
    self.genome_sample = fasta.definition    

    g=Generator.last
    p=self.genome_seq.scan(g.c_primer)
    self.binding_times= p.length()      
  end

end

ResultContorller

def index
    @results = Result.all(:include => :generator)
  end

def create
    @result = Result.new
    @result = @result.generate_result(result_params)
    @generator = Generator.find(params[:id])
    @result = generator.results.build(result_params)

   respond_to do |format|
      if @result.save
        format.html { redirect_to @result, notice: 'Result was successfully created.' }
        format.json { render action: 'show', status: :created, location: @result }
      else
        format.html { render action: 'new' }
        format.json { render json: @result.errors, status: :unprocessable_entity }
      end
    end
  end

2 个答案:

答案 0 :(得分:0)

我只想在控制器中创建一个变量:

@generators = Generator.all

然后在你看来......

<% @generators.each do |g| %>
  <% g.results.each do |r| %>
    <% debug r %>   
  <% end %>
<% end %>

这听起来就像你用来试图拔出所有发电机的代码一样。

答案 1 :(得分:0)

您正在尝试实施嵌套资源http://guides.rubyonrails.org/routing.html#nested-resources

您需要将路线修改为类似

的路线
  resources :generators do
    resources :results
  end

这样你就拥有了generator_id,所以你可以将你的控制器代码修改为:

  generator = Generator.find(params[generator_id])
  generator.results.build(result_params)