How to connect with different tables depending on parameter - ruby-on-rails

Question

I have model Board and BoardController where i can find all boards of my project.
All records have filled "board_layout" column with enum.
Now i have show method in BoardController and i want to load there different data from different table depending on board_layout column value.
I could do it like this:
def show
#board = Board.find(params[:id])
if #board.board_layout == 1
#tasks = Car.where(board_id: #board.id)
elsif #board.board_layout == 2
#tasks = Truck.where(board_id: #board.id)
end
end
But it's not elegant + it is not DRY (i need to use some sort of if statement anytime when i want to do something with those 2 tables).
So i have tried to create Concern and create case statement inside, now it looks like:
def show
#board = Board.find(params[:id])
#tasks = get_class_name(#board.board_layout).where(board_id: #board.id)
end
# inside my concern
def get_class_name(scope)
case scope
when 1
Car
when 2
Truck
end
end
My Question:
Is there better way to do it? Is my solution safe and clear?
What is the best solution to resolve problem like this?
I would appreciate any help.

Answer 1

maybe you can abstract that out into a class, so you can define multiple layout and their correspondent classes, like:
class LayoutClassGetter
CLASS_BY_LAYOUT = { '1' => Car, '2' => Truck }.freeze
def initialize(layout_number)
#layout_number = layout_number
end
def layout_class
CLASS_BY_LAYOUT[#layout_number]
end
def self.layout_class(layout_number)
new(layout_number).layout
end
end
And then use it:
def show
#board = Board.find(params[:id])
#tasks = layout_class(#board.board_layout).where(board_id: #board.id)
end
def layout_class(scope)
LayoutClassGetter.layout_class(scope)
end