How to reference a model instance at a given point of time in rails? -

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i creating two-sided rental platform, owner sets price product freely. whenever renter creates booking, need lock in snapshot of product model sensitive information pricing locked in rental. 1 thing tried storing every information again @ rental model, seems vulnerable future changes , updates.

is there better way overcome problem?

--- edit, make more specific ---

so in products table: 

def change   create_table :products |t|     t.integer :hourly_rate     t.integer :daily_rate   end end

and in rental_requests table, need have similar columns.

def change   create_table :rental_requests |t|     t.integer :hourly_rate     t.integer :daily_rate   end end

which may cause problems when have update columns in product, means have update both tables.

your product can have many prices, , expose price method returns latest price. rental can belong price.


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