[英]undefined method `gsub' for nil:NilClass or how to use gsub method in rails
I want to generate an Employee_ID
with serially, I have fixed a initial employee id in database table. 我想按顺序生成
Employee_ID
,我已修复数据库表中的初始员工ID。 the format is "E36162000", I am taking last employee id from table then extract only integer value then add one, this will be next employee id
. 格式为“ E36162000”,我从表中获取最后一个员工编号,然后仅提取整数值,然后加一个,这将是下一个
employee id
。
But in this gsub() method is not working, gsub method extract integer is perfectly, link Next Employee_id = E36162001 但是在这个gsub()方法不起作用的情况下,gsub方法提取的整数是完美的,链接Next Employee_id = E36162001
But when am i submit then error comes. 但是,当我提交时,就会出现错误。 I am sending code and screen sort please help me
我正在发送代码和屏幕排序,请帮助我
_employee_details.html.erb - this is my view _employee_details.html.erb-这是我的观点
<div class="modal-body">
<h2 class="text-center">Add <span>Employee Details</span></h2>
<div class="post-new-job head-border">
<div class="alert alert-success" role="alert" id='success-job' style='display:none;'>Employee Details is successfully added.</div>
<div class="form-body">
<%= form_for(:employee_details, :url => {:controller => 'hr', :action => 'create'}) do |f| %>
<div class="col-md-12">
<!--auto generate emp id-->
<% @last_emp_id = EmployeeDetail.select("employee_id").last %>
<% emp_id = @last_emp_id.employee_id %>
<% emp_id_sub = emp_id.gsub(/[^\d]/, '') %>
<% auto_generate_id = 'E'.to_s + (emp_id_sub.to_i + 1).to_s %>
<h1> Employee ID : <%= auto_generate_id %> </h1>
<div class="mydata">
<%= f.hidden_field :offer_letter_id, { class: 'form-control', id: 'recipient-name' } %>
</div>
<div class="form-group">
<label class="control-label">Employee ID</label>
<div class="input-group"> <span class="input-group-addon"> <i class="fa fa-user"></i> </span>
<%= f.text_field :employee_id, { :value => auto_generate_id, :disabled=>true , :required => true, placeholder: 'E12345678', class: 'form-control' } %>
</div>
</div>
<div class="form-group">
<label class="control-label">Bank Account</label>
<div class="input-group"> <span class="input-group-addon"> <i class="fa fa-university"></i> </span>
<%= f.text_field :bank_ac, {placeholder: '06464060852634865', class: 'form-control' } %>
</div>
</div>
<div class="form-group">
<label class="control-label">Bank IFSC Code</label>
<div class="input-group"> <span class="input-group-addon"> <i class="fa fa-code"></i> </span>
<%= f.text_field :bank_ifsc, {placeholder: 'SBI012356', class: 'form-control' } %>
</div>
</div>
<div class="form-group">
<label class="control-label">End of Date</label>
<div class="input-group"> <span class="input-group-addon"> <i class="fa fa-calendar"></i> </span>
<%= f.text_field :work_end_date, { placeholder: 'MM/DD/YYYY', id: 'datepicker', class:"datepicker_style" } %>
</div>
</div>
<div class="form-group">
<label class="control-label">Gender</label>
<div class="input-group"> <span class="input-group-addon"> <i class="fa fa-male fa-female"></i> </span>
<%= f.select :gender, ['Male', 'Female'], { }, class: "form-control" %>
</div>
</div>
<div class="form-group">
<label class="control-label">Spouse Name</label>
<div class="input-group"> <span class="input-group-addon"> <i class="fa fa-user"></i> </span>
<%= f.text_field :spouse_name, { placeholder: 'Father/Mother/Wife name', class: "form-control" } %>
</div>
</div> <br>
<div class="form-group">
<a><%= f.submit "Add Employee Details", :class => "btn btn-primary" %></a>
</div>
</div>
<div class="col-md-2"></div>
<%- end -%>
</div>
</div>
</div>
employee_details.rb - this is my model employee_details.rb-这是我的模型
class EmployeeDetail < ActiveRecord::Base
belongs_to :user
validates :offer_letter_id, presence: true
end
hr_controller.rb - this is my controler hr_controller.rb-这是我的控制者
class HrController < ApplicationController
def new
@employees = EmployeeDetail.new
end
# edit employee information
def edit
@employees = EmployeeDetail.find(params[:id])
end
def create
@employees = EmployeeDetail.new(employee_params)
if @employees.save
redirect_to :action => 'internal_employee_page'
else
redirect_to :action => 'internal_employee_page'
end
end
def show
@employees = EmployeeDetail.find(params[:id])
end
def update
@employees = EmployeeDetail.find(params[:id])
if @employees.update(employee_params)
redirect_to :action => 'internal_employee_page'
else
redirect_to :action => 'internal_employee_page'
end
end
private
def employee_params
params.require(:employee_details).permit(:offer_letter_id, :employee_id, :bank_ac, :bank_ifsc, :spouse_name, :gender, :work_end_date)
end
end
**Error in this line ** **此行中的错误**
<% emp_id_sub = emp_id.gsub(/[^\\d]/, '') %>
When am i Click on submit button then error is generate but data is save in employee_details table except Employee_Id 当我单击提交按钮时,会生成错误,但数据将保存在employee_details表中,除Employee_Id外
You might not have the emp_id
. 您可能没有
emp_id
。 Try changing the code to, 尝试将代码更改为
<% @last_emp_id = EmployeeDetail.select("employee_id").last %>
<% emp_id = @last_emp_id.employee_id %>
<% emp_id_sub = emp_id.present? ? emp_id.gsub(/[^\d]/, '') : ''%>
<% auto_generate_id = emp_id_sub.length > 0 ? ? ('E'.to_s + (emp_id_sub.to_i + 1).to_s) : "" %>
<h1> Employee ID : <%= auto_generate_id %> </h1>
checking the presence of emp_id
and then emp_id_sub
检查是否存在
emp_id
,然后检查emp_id_sub
Update: Added a sample query using select as per comment of @mudasobwa 更新:添加了一个示例查询,使用@mudasobwa的注释作为select
2.3.1 :015 > @user = User.select("email").last
User Load (0.5ms) SELECT `users`.`email` FROM `users` ORDER BY `users`.`id` DESC LIMIT 1
=> #<User id: nil, email: "test@ead.com">
2.3.1 :016 > email = @user.email
=> "test@ead.com"
We can create also a method in the model and we can call before_save, whenever create a new employeee details then before save it will be execute and store employee id into database 我们还可以在模型中创建一个方法,并且可以调用before_save,只要创建新的employeee详细信息,然后在保存之前将其执行并将雇员id存储到数据库中
class EmployeeDetail < ActiveRecord::Base
belongs_to :user
validates :offer_letter_id, presence: true
# auto generate employee id
before_save :Auto_generate_emp_id
def Auto_generate_emp_id
@last_emp_id = EmployeeDetail.order("employee_id").last
emp_id = @last_emp_id.employee_id
emp_id_sub = emp_id.gsub(/[^\d]/, '')
auto_generate_id = 'E'.to_s + (emp_id_sub.to_i + 1).to_s
self.employee_id = auto_generate_id
end
end 结束
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