add ChampColumn

app/models/column.rb

@@ -52,96 +52,7 @@ class Column
     procedure.find_column(h_id: h_id)
   end
 
-  def value(champ)
-    return if champ.nil?
-
-    value = typed_value(champ)
-    if default_column?
-      cast_value(value, from_type: champ.last_write_column_type, to_type: type)
-    else
-      value
-    end
-  end
-
   private
 
   def column_id = "#{table}/#{column}"
-
-  def typed_value(champ)
-    value = string_value(champ)
-    parse_value(value, type: champ.last_write_column_type)
-  end
-
-  def string_value(champ) = champ.public_send(value_column)
-  def default_column? = value_column.in?([:value, :external_id])
-
-  def parse_value(value, type:)
-    return if value.blank?
-
-    case type
-    when :boolean
-      parse_boolean(value)
-    when :integer
-      value.to_i
-    when :decimal
-      value.to_f
-    when :datetime
-      parse_datetime(value)
-    when :date
-      parse_datetime(value)&.to_date
-    when :enums
-      parse_enums(value)
-    else
-      value
-    end
-  end
-
-  def cast_value(value, from_type:, to_type:)
-    return if value.blank?
-    return value if from_type == to_type
-
-    case [from_type, to_type]
-    when [:integer, :decimal] # recast numbers automatically
-      value.to_f
-    when [:decimal, :integer] # may lose some data, but who cares ?
-      value.to_i
-    when [:integer, :text], [:decimal, :text] # number to text
-      value.to_s
-    when [:enum, :enums] # single list can become multi
-      [value]
-    when [:enum, :text] # single list can become text
-      value
-    when [:enums, :enum] # multi list can become single list
-      value.first
-    when [:enums, :text] # multi list can become text
-      value.join(', ')
-    when [:date, :datetime] # date <=> datetime
-      value.to_datetime
-    when [:datetime, :date] # may lose some data, but who cares ?
-      value.to_date
-    else
-      nil
-    end
-  end
-
-  def parse_boolean(value)
-    case value
-    when 'true', 'on', '1'
-      true
-    when 'false'
-      false
-    end
-  end
-
-  def parse_enums(value)
-    JSON.parse(value)
-  rescue JSON::ParserError
-    nil
-  end
-
-  def parse_datetime(value)
-    Time.zone.parse(value)
-  rescue ArgumentError
-    nil
-  end
 end