創建和更新來自同一字段的記錄與RoR

Question

我正在構建一個rails應用程序，供人們用來記錄他們在給定的一週內執行了多少個步驟。

該應用程序的功能包括一個活動記錄器，用戶可以進入步驟，單擊日曆上顯示的一週，然後單擊提交。然後，應用程序將創建該人員ID的記錄，步驟被採取時的步驟和步驟。如果同一用戶在一天中記錄不同數量的步驟，則相同的步驟記錄器應更新步驟計數。

我無法將邏輯放入控制器，以檢查是否存在與正在添加的步驟具有相同user_id和step_date的步驟記錄。

我已經看過「find_or_initialize_by」/「find_or_create_by」，但沒有多少運氣。

任何人都可以指向正確的方向嗎？下面的代碼。

記錄形式（_activityLog.html.erb）：

<%= simple_form_for Step.new do |f| %> 
     <%= f.hidden_field :user_id, :value => @user.id %> 
     <%= f.hidden_field :challenge_id, :value => "1" %> 
     <div class="input-group"> 
     <span class="input-group-addon" id="basic-addon2">Steps I've Taken:</span> 
     <%= f.input :step_count, label: false, id: "step_count", class: "form-control", required: true %> 
     </div> 
     <div id="weekpicker"></div> 
     <%= f.input :step_date, as: :hidden, input_html: { class: 'week' } %> 
     <%= f.button :submit, "Log Activity", class: "submit btn-block", id: "submitWeekly" %> 
<% end %> 

步驟控制器（steps_controller.rb）

class StepsController < ApplicationController 


before_action :set_step, only: [:show, :edit, :update, :destroy] 
    # GET /steps 
    # GET /steps.json 
    def index 
    @steps = Step.all 
    end 
    # GET /steps/1 
    # GET /steps/1.json 
    def show 
    redirect_to(:back) 
    end 
    # GET /steps/new 
    def new 
    @step = Step.new 
    end 
    # GET /steps/1/edit 
    def edit 
    end 
    # POST /steps 
    # POST /steps.json 
    def create 
    @step = Step.new(step_params) 
    respond_to do |format| 
     if @step.save 
     format.html { redirect_to @step, notice: 'Step was successfully created.' } 
     format.json { render :show, status: :created, location: @step } 
     else 
     format.html { render :new } 
     format.json { render json: @step.errors, status: :unprocessable_entity } 
     end 
    end 
    end 
    # PATCH/PUT /steps/1 
    # PATCH/PUT /steps/1.json 
    def update 
    respond_to do |format| 
     if @step.update(step_params) 
     format.html { redirect_to @step, notice: 'Step was successfully updated.' } 
     format.json { render :show, status: :ok, location: @step } 
     else 
     format.html { render :edit } 
     format.json { render json: @step.errors, status: :unprocessable_entity } 
     end 
    end 
    end 
    # DELETE /steps/1 
    # DELETE /steps/1.json 
    def destroy 
    @step.destroy 
    respond_to do |format| 
     format.html { redirect_to steps_url, notice: 'Step was successfully destroyed.' } 
     format.json { head :no_content } 
    end 
    end 
    private 
    # Use callbacks to share common setup or constraints between actions. 
    def set_step 
     @step = Step.find(params[:id]) 
    end 
    # Never trust parameters from the scary internet, only allow the white list through. 
    def step_params 
     params.require(:step).permit(:user_id, :challenge_id, :step_date, :step_count) 
    end 
end 

步驟模型（step.rb）

class Step < ActiveRecord::Base 
    belongs_to :user 
    belongs_to :challenge 
end 

Answer 1

也許這樣？

def create 
    # ... leaving some stuff out :) 
    @step = Step.where(user_id: params[:user_id], step_date: params[:step_date]).first_or_initialize(step_params) # or first_or_create 
    # ... other code here (leaving more stuff out) 
end