db/migrate/20250824163257_create_fertilizer_compositions.rb


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class CreateFertilizerCompositions < ActiveRecord::Migration[8.0]
  def change
    create_table :fertilizer_compositions do |t|
      t.references :fertilizer_product, null: false, foreign_key: true
      t.references :fertilizer_component, null: false, foreign_key: true
      t.decimal :percent_w, precision: 6, scale: 3, null: false  # e.g. 13.500 (% w/w)

      t.timestamps
    end
  end
end