Question

我试图从模型中选择一个不同的列，然后在选择下拉列表中显示这些结果。除了未显示该列的值之外，其他所有内容似乎都正常运行。它显示某种十六进制值或其他内容。这是我的变量：

@incidenttypes = Incident.select(:incidenttype).distinct.order("incidenttype")

这是选择的形式：

<%= f.select :incidenttype, @incidenttypes, {include_blank: true}, class: 'form-control' %>

输出看起来像这样：#<Incident:0x0000000e97a88>

对我在做什么错有任何想法吗？

更新：这是表的架构：

create_table "incidents", force: :cascade do |t|
t.string "street"
t.string "city"
t.string "zip"
t.integer "dayofweek"
t.date "timeofday"
t.string "state"
t.string "incidenttype"
t.string "drnum"
t.string "weatherevent"
t.string "specialevent"
t.float "latitude"
t.float "longitude"
t.text "comments"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end

这是搜索表单：

   <%= form_for(:search, url: incidents_path, method: :get) do |f| %>
    <div class="ui-bordered px-4 pt-4 mb-4">
      <div class="form-row">
        <div class="col-md mb-4">
          <label class="form-label">Type</label>
          <%= f.select :dayofweek, Incident.dayofweeks.keys, {:include_blank=> 'Any days', :selected => @dayofweek}, class: 'custom-select' %>
        </div>
        <div class="col-md mb-4">
          <label class="form-label">Incident Type</label>

          <%= f.select :incidenttype, options_for_select(@incidenttypes), {include_blank: true}, class: 'form-control' %>

        </div>
        <div class="col-md mb-4">
          <label class="form-label">Created date</label>
          <%= f.text_field :created_at, class: 'form-control', id: 'tickets-list-created', :autocomplete => :off, value: created_at_from_parameters %>

        </div>
        <div class="col-md col-xl-2 mb-4">
          <label class="form-label d-none d-md-block">&nbsp;</label>
          <button type="submit" class="btn btn-secondary btn-block">Show</button>
        </div>
      </div>
    </div>
    <% end %>

事件控制器：

    class IncidentsController < ApplicationController
      before_action :set_incident, only: [:show, :edit, :update, :destroy]

      # GET /incidents
      # GET /incidents.json
      def index
        if params[:search] && params[:search][:created_at].present?
          start_date, end_date = params[:search][:created_at].split(' - ')
        @incidents = Incident.where(created_at: start_date..end_date).where(dayofweek: params[:search][:dayofweek]).where(incidenttype: params[:search][:incidenttype])
        @dayofweek = params[:search][:dayofweek]
        @incidenttypes = Incident.order("incidenttype").pluck(:incidenttype, :incidenttype).uniq

        else
        @incidents = Incident.all
        end
      end

      def map
        @incidents = Incident.all
      end

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

      # GET /incidents/new
      def new
        @incident = Incident.new
      end

      # GET /incidents/1/edit
      def edit
      end

      # POST /incidents
      # POST /incidents.json
      def create
        @incident = Incident.new(incident_params)

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

      # PATCH/PUT /incidents/1
      # PATCH/PUT /incidents/1.json
      def update
        respond_to do |format|
          if @incident.update(incident_params)
            format.html { redirect_to @incident, notice: 'Incident was successfully updated.' }
            format.json { render :show, status: :ok, location: @incident }
          else
            format.html { render :edit }
            format.json { render json: @incident.errors, status: :unprocessable_entity }
          end
        end
      end

      # DELETE /incidents/1
      # DELETE /incidents/1.json
      def destroy
        @incident.destroy
        respond_to do |format|
          format.html { redirect_to incidents_url, notice: 'Incident was successfully destroyed.' }
          format.json { head :no_content }
        end
      end

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

        # Never trust parameters from the scary internet, only allow the white list through.
        def incident_params
          params.require(:incident).permit(:street, :city, :zip, :dayofweek, :timeofday, :state, :incidenttype, :drnum, :weatherevent, :specialevent, :latitude, :longitude, :comments)
        end
    end

Answer 1

要了解更多options_for_select和Select helper

将查询重构为

@incidenttypes = Incident.order("incidenttype").distinct.pluck(:incidenttype, :id)

使用options_for_select(@incidenttypes)

<%= f.select :incidenttype, options_for_select(@incidenttypes), {include_blank: true}, class: 'form-control' %>

要使用的形式如下

@incidenttypes = Incident.order("incidenttype").distinct.pluck(:incidenttype, :incidenttype)

在optoptions_for_select中（选项和值的数组，提交表单后的slected_value）

<%= f.select :incidenttype, options_for_select(@incidenttypes, params[:incident][:incidenttype]), {include_blank: true}, class: 'form-control' %>

Rails表单选择问题，以十六进制显示结果

1 个答案: