registerhour.rb

class Registerhour < ActiveRecord::Base
  before_save :check_hours
	belongs_to :project
	belongs_to :admin

	validates_presence_of :project, :timetype
	validate :from_time_cannot_be_after_to_time
  
  def from_time_cannot_be_after_to_time
  	if from.present? && from >= to 
			errors.add(:from, "Kan ikke være lik eller i fortid")
		end
	end
  
end

registerhour_controller.rb

def create
  @registerhour = Registerhour.new(registerhour_params)
  #@registerhour.date_today = Date.today
  respond_to do |format|
    if Registerhour.exists?(project_id: @registerhour.project_id, timetype: @registerhour.timetype, date_today: Date.today, admin_id: current_admin.id, from: @registerhour.from..@registerhour.to, to: @registerhour.from..@registerhour.to) == 1
      flash[:error] = "Timer allerede registrert for dette prosjektet."
      format.html { render 'new' }
    #if check_hours == 1
    #  flash[:error] = "Timer allerede registrert for dette prosjektet."
    #  format.html { render 'new' }
    else
      if @registerhour.save
        format.html { redirect_to my_hours_url, notice: 'Timer registrert.' }
        format.json { render action: 'show', status: :created, location: @registerhour }
      else
        format.html { render action: 'new' }
        format.json { render json: @registerhour.errors, status: :unprocessable_entity }
      end
    end
  end
end

private

# Use callbacks to share common setup or constraints between actions.
def set_registerhour
  @registerhour = Registerhour.find(params[:id])
  #@registerhour = Registerhour.where(:admin_id => current_admin.id)
end

# Never trust parameters from the scary internet, only allow the white list through.
def registerhour_params
  params.require(:registerhour).permit(:date_today, :from, :to, :timetype, :notes, :approved, :projects, :project_id, :firstname, :admin_id)
end