我正在尝试使用 collection_select 而不是 select。
<%= form_for(@technol) do |tech| %>
  <div class="field">
    <%= tech.label :tech %><br />
    <%=  tech.select(:tech, Technol.all.map {|p| [p.tech]}.uniq,:prompt => "Select a previous role") %>
  </div>
<%end%>
此代码有效,允许我将一项技术链接到一个项目。我试图这样做:
<%= form_for(@technol) do |tech| %>
   <div class="field">
    <%= tech.label :tech %><br />
    <%= tech.collection_select(:tech,  Technol.all, :id, :tech, {}, {:multiple => true} ) %>
  </div>
<%end%>
出现collection_select,所有技术都显示在下拉列表中,当我选择一些并提交项目时,这些技术显示为一个条目,通过它们的ID。
--- - '' - '11' - '12' - '13'
这是我的创建操作,我认为是导致问题的原因:
def create
    @project = Project.new(params[:project])
    @technol = Technol.new(params[:tech])
    params[:technol].each_value do |tech|
    technology = Technol.find_or_create_by_tech(tech)
    @project_technol = @project.projecttechnols.build(:technol_id => technology.id) 
end
    respond_to do |format|
      if @project.save
        format.html { redirect_to @project, notice: 'Project was successfully created.' }
        format.json { render json: @project, status: :created, location: @project }
      else
        format.html { render action: "new" }
        format.json { render json: @project.errors, status: :unprocessable_entity }
      end
    end
  end
我认为这是我循环的方式有问题。希望有人能看到。我是 Rails 新手,所以在尝试帮助我时请记住这一点。提前致谢。
更新
我尝试将 collection_select 更改为:
<%=  tech.select(:technol, :id, Technol.all.map {|p| [p.tech]}.uniq,:prompt => "Select a previous role") %>
我得到这个错误。wrong number of arguments (7 for 6)
罗斯更新:
wrong number of arguments (7 for 6)
Extracted source (around line #273):
273: tech.collection_select(:tech, :tech_ids, Technol.all, :id, :tech, {:prompt => "Select a previous role"}, {:multiple => true} )