How in Rails, when creating one model, take data from other models?

Question

Ruby on Rails

Hello!
I want to create a table where the data of automobile tires would be stored. Tires have parameters such as name, load index and speed index. The indexes themselves and their corresponding values ​​are stored in two other tables.
There are three models.

Tire: (belongs_to :load_index; belongs_to :speed_index)
  name:string
  speed_index:references
  load_index:references
LoadIndex: (has_many :tires)
  index:integer (Тут индекс нагрузки)
  value:integer (Тут значение нагрузки, соответствующее индексу нагрузки)
SpeedIndex: (has_many :tires)
  index:string (Тут индекс скорости)
  value:integer (Тут значение скорости, соответствующее индексу скорости)

Is there some easy way to create a Tire instance knowing only the index value from load_indices and speed_indices and not knowing the corresponding speed_index_id and load_index_id?

Answer 1

There is.
And if you need something else, arrange the question in code blocks and describe the task normally (for example, in more detail)