Question

以为我理解自定义路线，但显然不是因为它不起作用。

目前已在Forecast型号中设置此项：

class Forecast < ApplicationRecord

  def get_weather_data_paris
    ForecastIO.forecast(48.8566, 2.3522) 
  end

end

适用于ForecastsController show动作......，即：

def show       
  @weather = @forecast.get_weather_data_paris     
  @current_weather = @weather.currently  
  @daily_weather = @weather.daily.data.first(5)
end

决定我想为不同的地点设置单独的页面，因此，将这些内容从def show方法复制到def show_paris方法：

def show_paris 
  @weather = @forecast.get_weather_data_paris     
  @current_weather = @weather.currently  
  @daily_weather = @weather.daily.data.first(5)
end

在路线中添加了操作：

Rails.application.routes.draw do
  resources :forecasts
  root to: 'paris', to: "forecasts#show_paris"
end

现在，当我访问主页时，我收到此错误：

NoMethodError in ForecastsController#show_paris`
undefined method 'get_weather_data_paris' for nil:NilClass`

为什么会这样？我错过了什么？

如果有帮助，这是整个ForecastsController

class ForecastsController < ApplicationController
  before_action :set_forecast, only: [:show, :edit, :update, :destroy]

  # GET /forecasts
  # GET /forecasts.json
  def index
    @forecasts = Forecast.all
  end

  def show       
    @weather = @forecast.get_weather_data_paris     
    @current_weather = @weather.currently  
    @daily_weather = @weather.daily.data.first(5)
  end

  def show_paris 
    @weather = @forecast.get_weather_data_paris     
    @current_weather = @weather.currently  
    @daily_weather = @weather.daily.data.first(5)
  end

  # GET /forecasts/new
  def new
    @forecast = Forecast.new
  end

  # GET /forecasts/1/edit
  def edit
  end

  # POST /forecasts
  # POST /forecasts.json
  def create
    @forecast = Forecast.new(forecast_params)

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

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

  # DELETE /forecasts/1
  # DELETE /forecasts/1.json
  def destroy
    @forecast.destroy
    respond_to do |format|
      format.html { redirect_to forecasts_url, notice: 'Forecast was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def forecast_params
      params.require(:forecast).permit(:lat, :lng)
    end
end

Answer 1

尝试将forecasts#show_paris方法的内容定义为：

def show_paris 
  @forecast = Forecast.find(params[:id])

  @weather = @forecast.get_weather_data_paris     
  @current_weather = @weather.currently  
  @daily_weather = @weather.daily.data.first(5)
end

然后在routes.rb：

root to: 'paris', to: 'forecasts#show_paris', id: 1

这样您就会传递id，以使@forecast变量不是nil。

自定义路线不起作用

1 个答案: