1 nutrients = [ 2 { formula: "NNO3", name: "Nitrate" }, 3 { formula: "NNH4", name: "Ammonium" }, 4 { formula: "P", name: "Phosphorus" }, 5 { formula: "K", name: "Potassium" }, 6 { formula: "Ca", name: "Calcium" }, 7 { formula: "Mg", name: "Magnesium" }, 8 { formula: "S", name: "Sulfur" }, 9 { formula: "Na", name: "Sodium" }, 10 { formula: "Cl", name: "Chloride" }, 11 { formula: "Si", name: "Silicon" }, 12 { formula: "Fe", name: "Iron" }, 13 { formula: "Zn", name: "Zinc" }, 14 { formula: "B", name: "Boron" }, 15 { formula: "Mn", name: "Manganese" }, 16 { formula: "Cu", name: "Copper" }, 17 { formula: "Mo", name: "Molybdenum" } 18 ] 19 20 nutrients.each do |attrs| 21 Nutrient.find_or_create_by!(attrs) 22 end 23