Ruby on rails 如何在创建表时创建具有比例和精度的数字数据类型

我得到了这个错误

create_table :offers do |t|
  t.numeric(15,2) :total_sales
  t.numeric(10,2) :price
  t.numeric(10,2) :discount
end

---

要使用十进制类型存储财务数据：

create_offers.rb:12: syntax error, unexpected ':', expecting keyword_end
      t.numeric(15,2) :total_sales
                       ^
/home/gvpmahesh/code/present-app/present/db/migrate/20161017072207_create_offers.rb:13: syntax error, unexpected ':', expecting keyword_end
      t.numeric(10,2) :price
                       ^
/home/gvpmahesh/code/present-app/present/db/migrate/20161017072207_create_offers.rb:14: syntax error, unexpected ':', expecting keyword_end
      t.numeric(10,2) :discount
                       ^

---

签出。

要使用十进制类型存储财务数据：

create_offers.rb:12: syntax error, unexpected ':', expecting keyword_end
      t.numeric(15,2) :total_sales
                       ^
/home/gvpmahesh/code/present-app/present/db/migrate/20161017072207_create_offers.rb:13: syntax error, unexpected ':', expecting keyword_end
      t.numeric(10,2) :price
                       ^
/home/gvpmahesh/code/present-app/present/db/migrate/20161017072207_create_offers.rb:14: syntax error, unexpected ':', expecting keyword_end
      t.numeric(10,2) :discount
                       ^

退房

create_table :offers do |t|
  t.decimal :total_sales, precision: 15, scale: 2 
  t.decimal :price, precision: 10, scale: 2 
  t.decimal :discount, precision: 10, scale: 2 
end