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大家好，我有一个关于 params[:value] 的问题。

我的模型必须只包含名为 value 的变量属性，我才能在我的控制器中使用这个 params[:value] 吗？

我正在尝试从我的 VIEW 中获取数据，但变量值将仅用于 1 个函数。所以我在想是否有其他方法可以做。

在我看来[这个问题与 2nd radio_button = Number Of ATGC specified]：

<%= form_for (@generator ) do |f| %>
  <% if @generator.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@generator.errors.count, "error") %> prohibited this generator from being saved:</h2>

      <ul>
      <% @generator.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <label>Primer Length</label><br>
       <%= f.number_field :primer_length , min: 3 %>
  </div>

    <label>Selection :</label><br>
<table>
    <thead>
      <tr>
        <th><label>Randomly</label>
        <%= radio_button_tag(:choice, 'Randomly', true )%></th>

        <th><label>Number of ATGC specified</label>
        <%= radio_button_tag(:choice,'No_of_ATGC')%> </th>
     </tr>
    </thead>

    <tbody>
        <tr>
            <td></td>
            <td><label>Number of A :</label>
            <%= number_field_tag 'No_of_A'%><br>
            <label>Number of T :</label>
            <%= number_field_tag 'No_of_T'%><br>
            <label>Number of G :</label>
            <%= number_field_tag 'No_of_G'%><br>
            <label>Number of C :</label>
            <%= number_field_tag 'No_of_C'%><br></td>
        </tr>
    </tbody>
</table>    

<%= button_to('Generate',generate_option_generator_path(@generator))%>
<% end %>

在生成器控制器中

class GeneratorsController < ApplicationController
  before_action :set_generator, only: [:show, :edit, :update, :destroy]
  after_action :generate_option, only: [:create, :update]
  # GET /generators
  # GET /generators.json
  def index
    @generators = Generator.all
  end

  # GET /generators/1
  # GET /generators/1.json
  def show
  end

  # GET /generators/new
  def new
    @generator = Generator.new
  end

  # GET /generators/1/edit
  def edit
  end

  # POST /generators
  # POST /generators.json
  def create    
    @generator = Generator.new(generator_params)

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

  # PATCH/PUT /generators/1
  # PATCH/PUT /generators/1.json
  def update
    respond_to do |format|
      if @generator.update(generator_params)
        format.html { redirect_to @generator, notice: 'Generator was successfully updated.' }
        format.json { head :no_content }
        #random_generate
        #@generator.save!
      else
        format.html { render action: 'edit' }
        format.json { render json: @generator.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /generators/1
  # DELETE /generators/1.json
  def destroy
    @generator.destroy
    respond_to do |format|
      format.html { redirect_to generators_url }
      format.json { head :no_content }
    end
  end

  def generate_option
    @generator.choice = params[:choice]
    if params[:choice] == 'Randomly'
        random_generate
    elsif params[:choice] == 'No_of_ATGC'

    end
    @generator.save!
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_generator
      @generator = Generator.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def generator_params
      params.require(:generator).permit(:primer_length, :choice, :random_primer_generated)
    end
end

在应用程序控制器中：

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception 
  def random_generate
     length = @generator.primer_length
        chars = 'ATGC'
        seq = ''
        length.times { seq << chars[rand(chars.size)] }
       @generator.random_primer_generated = seq
  end

  def no_ATGC

    counts = {'a'=>no_of_a,'t'=>no_of_a,'g'=>no_of_a,'c'=>no_of_a}
    @generator.random_primer_generated = Bio::Sequence::NA.randomize(counts)

  end

end

基本上这就是我需要做的。我需要知道有多少 A's T's G's 和 C's 以便为用户生成一些东西。我也不确定是否可以在 Rails 中访问 gem Bioruby 〜我不必担心 RUby 但 Rails 架构有点困难。我在我的 gemfile 中定义了 gem Bioruby。希望它有效。

4

2 回答 2

1

params 包含从提交的表单中收到的信息。因此，这实际上取决于您的表单中是否有名称为“值”的字段（编辑框、选择框等）。因为，大多数 Rails 表单都是从模型生成的，通常，这意味着您的模型中有一个属性“值”。

于 2013-06-29T09:41:16.800 回答
1

如果您尝试使用参数创建/更新模型项，则模型会受到关注。您可以将任何参数作为参数传递给控制器​​，但如果您创建/更新模型项，则参数必须在模型中。

于 2013-06-29T09:51:59.633 回答