Couldn't find Student with 'student_id'= RUBY ON RAILS - ruby-on-rails

Question

I am trying to pull up an edit page for my simple system.
Here's my controller for student look like:
class StudentsController < ApplicationController
def index
#students = Student.newest_first
end
def show
#student = Student.find(params[:student_id])
end
def new
#student = Student.new
end
def create
#student = Student.new(student_params_create)
if #student.save
flash[:notice] = "Student record created successfully"
redirect_to(students_path)
else
render('new')
end
end
def edit
#student = Student.find(params[:student_id])
end
def update
#student = Student.find(params[:student_id])
if #student.update_attributes(student_params_update)
flash[:notice] = "Students updated"
redirect_to(students_path)
else
render('edit')
end
end
def delete
#student = Student.find(params[:student_id])
end
def destroy
#student = Student.find(params[:student_id])
#student.destroy
end
private
def student_params_create
params.require(:student).permit(:first_name, :last_name, :birthday, :email, :subjects, :username, :password)
end
def student_params_update
params.require(:student).permit(:first_name, :last_name, :birthday, :email, :subjects)
end
end
And I am trying to here's my index page where I can click edit on my student.
<% #students.each do |student|%>
<%= student.first_name %>
<%= student.student_id %>
<%= link_to("Show", student_path(student), :class => 'action show') %>
<%= link_to("Edit", edit_student_path(student), :class => 'action edit') %>
<%= link_to("Delete", delete_student_path(student), :class => 'action delete') %>
<% end %>
For my form edit, I got the ff:
<h2>Update Subject</h2>
<%= form_for(#student) do |f| %>
<%= f.text_field(:first_name) %>
<%= f.datetime_select(:created_at, :order => [:month, :day, :year]) %><
<%= f.submit("Update Subject") %>
<% end %>
When I tried to go to my resource for students: http://localhost:3000/students/
And click on one of my students I got the ff: error:
Any idea what am I doing wrong????
EDIT:
I set the 'id' to false during migration.
def up
create_table :students, :id => false do |t|
t.integer "student_id",:primary_key => true
t.string "first_name", :limit => 25
t.string "last_name", :limit => 50
t.string "email", :default => ' ', :null => false
t.string "birthday"
t.string "subjects"
t.string "teachers"
t.string "username", :limit => 25
t.string "password_digest"
t.timestamps
end
reversible do |dir|
dir.up { execute "ALTER TABLE students AUTO_INCREMENT = 1000" }
end
# execute "CREATE SEQUENCE students_student_id_seq OWNED BY students.student_id INCREMENT BY 1 START WITH 1001"
end
def down
drop_table :students
# execute "DELETE SEQUENCE students_student_id_seq"
end
Routes:
resources :students do
member do
get :delete
end
end

Answer 1

UPDATE
You could need to update your routes.rb with
resources :students, param: :student_id
And your Student model with
self.primary_key = :student_id
NOTE that you're having the ActiveRecord::RecordNotFound exception because find method throws exception when it can't actually find the record needed. Try to use find_by_id method instead. It will just return nil in that situation. You'll be able to handle it easily and your app will not crash here. So you could edit your show action like this
def show
#student = Student.find_by_id(params[:student_id])
end