1. CS 142 Lecture Notes: FormsSlide 1 Simple Form Product: Price:

2. CS 142 Lecture Notes: FormsSlide 2 Rails Form Helpers {:action => :modify, :id => @student.id}) do |form| %> <input id="student_name" name="student[name]“ size="30" type="text" value="Chen" /> <input id="student_birth" name="student[birth]“ size="30" type="text" value="1990-02-04" /> <input name="commit" type="submit“ value="Modify Student" /> Describes type, provides initial values Object representing form

3. CS 142 Lecture Notes: FormsSlide 3 Customize Format {:action => :modify, :id =>@student.id}) do |form| %>...

4. CS 142 Lecture Notes: FormsSlide 4 Post Action Method def modify @student = Student.find(params[:id]) if @student.update_attributes(params[:student]) then redirect_to(:action => :show) else render(:action => :edit) end Hash with all of form data Redirects on success Redisplay form on error

5. CS 142 Lecture Notes: FormsSlide 5 Validation (in Model) class Student < ActiveRecord::Base validates_format_of :birth, :with => /\d\d\d\d-\d\d-\d\d/, :message => "must have format YYYY-MM-DD" def validate_gpa if (gpa 4.0) then errors.add(:gpa, "must be between 0.0 and 4.0") end validate :validate_gpa end Custom validation method Built-in validator Saves error info

6. CS 142 Lecture Notes: FormsSlide 6 Error Messages form_for(@student, :url => {:action => :modify, :id =>@student.id}) do |form| %>......

7. CS 142 Lecture Notes: FormsSlide 7 File Uploads with Rails {:multipart => true} :url => {...}) do |form| %>...... In form post method: params[:student][:photo].read() params[:student][:photo].original_filename

8. CS 142 Lecture Notes: CookiesSlide 8