ruby on rails - Custom validation after submit button is pressed -

is there way can make link_to submit button run custom validation?

i need writing validation checks presence of fields , make sure there @ least 4 entries in nested form array. im using gem cocoon nested form , project requires user has @ least 4 questions attached application form.

my associations follows:

class app < activerecord::base   belongs_to :user   has_many :questions, :dependent => :destroy end   class question < activerecord::base   belongs_to :app end 

multistep controller:

class userstepscontroller < applicationcontroller   include wicked::wizard    steps :personal, :school, :grades, :extra_activity, :paragraph, :submit    def show     @user = user.find(current_user)       case step     when :school, :grades, :extra_activity, :paragraph, :submit     @question = question.find(current_user)   end     render_wizard   end    def update     @user = user.find(current_user)     @user.update_attributes(user_params)     case step     when :school, :grades, :extra_activity, :paragraph, :submit     @question =  question.find(current_user)     @question.update_attributes(question_params)     end      render_wizard @user   end 

the multistep question form built once user created.

so example on second page of wicked form, i'm trying validate presence of highschool name validates :highschool, :presence => true im still able submit form on last submit page without highschool filled out.

solution:

i created migration on user called "steps", string.

i add following code user model:

class app < activerecord::base   validate :minimum_number_of_questions_required, if: "step == 'extra_activity'"    private    def minimum_number_of_questions_required     if questions.count < 4       errors[:base] << "you must have @ least 4 questions attached."     end   end end 

then in user_steps controller handles turning multiple models single multi page form, added following in update method:

case step when :extra_activity   @user.step = step.to_s end 

so in simple english, happening rails tracking user based on step of form on. based on step, can run validations specific forms step.

this useful fact need min of 4 questions on extra_activity step, not letting me past previous steps because validation wouldn't let it. remember working same model.

gems used: cocoon (for simple nested forms) , wicked (for simple multistep forms)

if these validations should enforce, , mean whenever attempt save app must have @ least 4 questions add so:

class app < activerecord::base   validate :minimum_number_of_questions_required    private    def minimum_number_of_questions_required     if questions.count < 4       errors[:base] << "you must have @ least 4 questions attached."     end   end end 

if wanted occur when form submitted set variable in app class lets object know should run minimum question validation:

class app < activerecord::base   attr_accessor :validate_questions    validate :minimum_number_of_questions_required, if: :validate_questions    # same code above validation end 

you have make sure code/form sets validates_question variable value evaluate true. i'm not huge fan of method quick , easy. other think have create sort of facade object or form object sits in front of activerecord model , validations form requires.

class appform   include activemodel::validation    # move validations code here end