Error.txt

ArgumentError in MasterLists#create
Showing /Projects/rails_projects/ProcessSteps/app/views/master_lists/_form.html.erb where line #1 raised:

First argument in form cannot contain nil or be empty
Extracted source (around line #1):
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<%= form_for(master_list) do |f| %>
  <% if master_list.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(master_list.errors.count, "error") %> prohibited this master_list from being saved:</h2>

      <ul>

Trace of template inclusion: app/views/master_lists/new.html.erb

Rails.root: /Projects/rails_projects/ProcessSteps

Application Trace | Framework Trace | Full Trace
app/views/master_lists/_form.html.erb:1:in `_app_views_master_lists__form_html_erb___887718772740080326_69888290694480'
app/views/master_lists/new.html.erb:3:in `_app_views_master_lists_new_html_erb__2646737281241535987_69888290846520'
app/controllers/master_lists_controller.rb:43:in `create'
Request

Parameters:

{"utf8"=>"✓",
 "authenticity_token"=>"tIVEHUmzaBQ1cV13BPp1T4JKg1jqvTuOvmi/zNyg4F1wlTfOhwoAlviYxvqyD6FEcDlUqqMogBsFBuKlWrVkSA==",
 "master_list"=>{"title"=>"Test 1", "description"=>"Test 1", "deleted"=>"0"},
 "commit"=>"Create Master list"}
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Response

Headers:

None
x
>>   

master_list_controller.rb

require 'active_support'
class MasterListsController < ApplicationController
  before_action :set_master_list, only: [:show, :edit, :update, :destroy]

  # GET /master_lists
  # GET /master_lists.json
  def index
    @master_lists = MasterList.all
  end

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

  # GET /master_lists/new
  def new
    @master_list = MasterList.new
  end

  # GET /master_lists/1/edit
  def edit
  end

  # POST /master_lists
  # POST /master_lists.json
  def create
    entry = MasterList.find_by 'title', master_list_params[:title]
    if entry
      @master_list = MasterList.new(master_list_params)

      respond_to do |format|
        if @master_list.save
          format.html { redirect_to @master_list, notice: 'Master list was successfully created.' }
          format.json { render :show, status: :created, location: @master_list }
        else
          format.html { render :new }
          format.json { render json: @master_list.errors, status: :unprocessable_entity }
        end
      end
    else
      flash[:notice] = 'Title must be unique'
       render :new
    end
  end

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

  # DELETE /master_lists/1
  # DELETE /master_lists/1.json
  def destroy
    @master_list.destroy
    respond_to do |format|
      format.html { redirect_to master_lists_url, notice: 'Master list was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def master_list_params
      params.require(:master_list).permit(:title, :description, :deleted)
    end
end