我非常沮丧，因为我已经工作了好几天，但我还没有找到解决方案。
我有一个Visit.rb模型，除了常见的验证之外，我还通过两种方法进行了两次验证（访问的开始日期不能在结束之前，并且不可能有两次访问具有相同的开始日期，结束日期和visitor_id）。
我需要在我给予登记访问的模式中显示我设置的这些错误，但直到现在我从未取得过成功。 实际上每次发生此错误时：VisitsController中的 ArgumentError #create - 表单中的第一个参数不能包含nil或为空
我到目前为止所做的是......
Visit.rb
class Visit < ActiveRecord::Base
belongs_to :employee
belongs_to :visitor
default_scope -> { order(:created_at) }
validates :from, presence: true, uniqueness: { scope: [:to, :visitor_id] }
validates :to, presence: true
validates :visitor_id, presence: true
validates :employee_id, presence: true
validate :valid_date_range_required
validate :visit_uniqueness
def valid_date_range_required
if (from && to) && (to < from)
errors[:base] << "Visit's end date cannot be prior to the start one."
end
end
def visit_uniqueness
if Visit.find_by(from: :from, to: :to, visitor_id: :visitor_id)
errors[:base] << "A visit with the same start date, end date and visitor already exists."
end
end
end
visits_controller.rb
class VisitsController < ApplicationController
before_action :logged_in_employee, only: [:create, :destroy]
before_action :correct_employee, only: [:destroy, :update ]
def create
@visit = current_employee.visits.build(visit_params)
if @visit.save
flash[:success] = "Visit added"
redirect_to employee_path(session[:employee_id], :act => 'guestsVisits')
else
@visits = current_employee.visits.all
@employee = current_employee
render 'employees/guestsVisits'
end
end
private
def visit_params
params.require(:visit).permit(:from, :to, :visitor_id, :employee_id)
end
def correct_employee
@visit = current_employee.visits.find_by(id: params[:id])
redirect_to root_url if @visit.nil?
end
end
guestsVisits.rb （我的观点）
<div class="jumbotron3 text-center">
<div class="row">
<h1>Guests Visits</h1>
<hr>
<%=render :partial =>"layouts/sidebar"%>
<div class="panel3">
<div class="panel-body">
<!-- Modal for Visit -->
<% if logged_in? %>
<%=render :partial =>"shared/error_messages"%>
<a class="btn icon-btn btn-success pos" data-toggle="modal" data-target="#visitModal">
<span class="glyphicon btn-glyphicon glyphicon-plus img-circle text-success"></span>
Add a visit
</a>
<div id="visitModal" class="modal fade" role="dialog">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<h4 class="modal-title">Add Visit</h4>
</div>
<div class="modal-body">
<%= form_for(@visit) do |f| %>
<%= f.label :start_date %>
<%= f.date_field :from, class: 'form-control',:value => (f.object.from.strftime('%m/%d/%Y') if f.object.from) %>
<%= errors_for @visit, :from %><%if @visit.errors.any?%><br><%end%>
<br>
<%= f.label :end_date %>
<%= f.date_field :to, class: 'form-control',:value => (f.object.to.strftime('%m/%d/%Y') if f.object.to) %>
<%= errors_for @visit, :to %><%if @visit.errors.any?%><br><%end%>
<br>
<%= f.label :Visitor %>
<%= f.collection_select :visitor_id, Visitor.all, :id, :full_name, { :class=> "form-control", :include_blank => ''}%>
<%= errors_for @visit, :visitor_id %><%if @visit.errors.any?%><br><%end%>
<br>
<%= f.submit "Add visit", class: "btn btn-primary btn-color" %>
<% end %>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-info" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
<% end %>
</div>
</div>
</div>
</div>
我尝试使用两个不同版本的error_messages.rb
error_messages.rb（1）
<% if @visit && @visit.errors.any? %>
<div id="error_explanation">
<div class="alert alert-danger">
<a href="#" class="close" data-dismiss="alert" aria-label="close">×</a>
The form contains <%= pluralize(@visit.errors.count, "error") %>.Open the modal for more details
</div>
</div>
<% end %>
error_messages.rb（2）
<% if @visit.errors.any? %>
<ul class="errors">
<% @visit.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
<% end %>
我希望有人可以帮助我，因为我不明白如何解决这个问题。 非常感谢你。
修改
class Employee < ActiveRecord::Base
before_save { self.email = email.downcase }
before_create :confirmation_token
VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
has_many :macaddresss, dependent: :destroy
has_many :visits, dependent: :destroy
has_many :visitors, dependent: :destroy
#Validations
validates :name, presence: true , length: { maximum:20 , minimum: 2 }
validates :lastname, presence: true, length: { maximum:20 , minimum: 2 }
validates :gender, presence: true
validates :dateofbirth, presence: true
validates :birth_country, presence: true
validates :birth_place, presence: true, length: { maximum:60}
validates :contry_of_residence, presence: true
validates :city_of_residence, presence: true, length: { maximum:60 }
validates :address, presence: true, length: { maximum:60 , minimum: 7 }
validates :email, presence: true, length: { maximum:243 } ,format: { with: VALID_EMAIL_REGEX }, uniqueness: { case_sensitive: false }
validates :password, length: { minimum: 6 }
validates :terms_of_service, acceptance: { message: 'accept terms and conditions' }
[...]
has_secure_password
def Employee.digest(string)
cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST :
BCrypt::Engine.cost
BCrypt::Password.create(string, cost: cost)
end
end
session_helper.rb
def current_employee
@current_employee ||= Employee.find_by(id: session[:employee_id])
end
EDIT2：
employees_controller.rb
class EmployeesController < ApplicationController
def show
if logged_in?
@employee = Employee.find(params[:id])
@indirizzimac = current_employee.indirizzimacs.new
@visitor = current_employee.visitors.new
@visit = current_employee.visits.new
@visits = current_employee.visits.all
if params[:act]=='myData'
render 'myData'
elsif params[:act]=='myNetwork'
render 'myData'
elsif params[:act]=='temporaryUsers'
render 'temporaryUsers'
elsif params[:act]=='guestsVisits'
render 'guestsVisits'
elsif params[:act]=='myAccount'
render 'myAccount'
else
render 'show'
end
else
render 'static_pages/errorPage'
end
end
end
答案 0 :(得分：1)
从我所看到的如果创建访问失败，您实例化@visits和@employee实例变量，然后呈现＆＃39; employees / guestsVisits＆＃39;它使用@visit的视图，我认为它不存在于empleyees控制器中
所以添加广告
def guestsVisits
@visit = current_employee.visits.build
end