Ruby on rails with paperclip - windows-8

Question

I am a new programmer on ruby on rails, and i have problem when upload picture. Deos anyone can help me. thanks in advance.
class StudentsController < ApplicationController
before_action :set_student, only: [:show, :edit, :update, :destroy]
# GET /students
# GET /students.json
def index
#students = Student.all
end
# GET /students/1
# GET /students/1.json
def show
end
# GET /students/new
def new
#student = Student.new
end
# GET /students/1/edit
def edit
end
# POST /students
# POST /students.json
def create
#student = Student.create(student_params)
respond_to do |format|
if #student.save
format.html { redirect_to #student, notice: 'Student was successfully created.' }
format.json { render :show, status: :created, location: #student }
else
format.html { render :new }
format.json { render json: #student.errors, status: :unprocessable_entity }
end
end
end
private
#def student_params
#params.require(:student).permit(:image_file)
#end
# PATCH/PUT /students/1
# PATCH/PUT /students/1.json
def update
respond_to do |format|
if #student.update(student_params)
format.html { redirect_to #student, notice: 'Student was successfully updated.' }
format.json { render :show, status: :ok, location: #student }
else
format.html { render :edit }
format.json { render json: #student.errors, status: :unprocessable_entity }
end
end
end
# DELETE /students/1
# DELETE /students/1.json
def destroy
#student.destroy
respond_to do |format|
format.html { redirect_to students_url, notice: 'Student was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_student
#student = Student.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def student_params
params.require(:student).permit(:name, :gender, :telephone, :address)#, :image_file
end
end

Answer 1

Can't really find a problem in your post. It's a bit hard to understand. Did you follow the docs on https://github.com/thoughtbot/paperclip? I take it your file attachment is in the Student model?
params.require(:student).permit(:name, :gender, :telephone, :address)#, :image_file
now you only permit to save name, gender, telephone and address, the image file wil not be saved. You still have to permit it.