Add surveys; custom generated by admins

Available during registration or after conference

Co-authored-by: Shyukri <shshyukriev@suse.com>
Co-authored-by: Henne <hvogel@opensuse.org>
Co-authored-by: Moises <mdeniz@suse.com>

app/models/survey_question.rb

@@ -0,0 +1,42 @@
+class SurveyQuestion < ActiveRecord::Base
+  belongs_to :survey
+
+  # Order of this list should not be changed without proper action!
+  enum kind: [:boolean, :choice, :string, :text, :datetime, :numeric]
+
+  ICONS = { boolean: 'dot-circle-o', choice: 'check-square-o', string: 'edit', text: 'align-left', datetime: 'clock-o', numeric: 'slack' }.freeze
+
+  validates :title, presence: true
+  validates :possible_answers, :max_choices, :min_choices, presence: true, if: 'choice?'
+  validates :min_choices, numericality: { greater_than_or_equal_to: 1 }, allow_blank: true
+  validates :max_choices, numericality: { greater_than_or_equal_to: 1 }, allow_blank: true
+
+  validate :max_choices_greater_than_min
+  has_many :survey_replies
+
+  def single_choice?
+    choice? && max_choices == 1 && min_choices == 1
+  end
+
+  def multiple_choice?
+    choice? && max_choices > 1
+  end
+
+  def possible_answers=(value)
+    self[:possible_answers] = choice? ? value : nil
+  end
+
+  def min_choices=(value)
+    self[:min_choices] = choice? ? value : nil
+  end
+
+  def max_choices=(value)
+    self[:max_choices] = choice? ? value : nil
+  end
+
+  private
+
+  def max_choices_greater_than_min
+    errors.add(:max_choices, 'Max choices should not be less than min choices') if choice? && max_choices.to_i < min_choices.to_i
+  end
+end