如何通过Rails C使用t.decimal精度和小数位数填充sql db

Question

t.decimal  "eur",        precision: 8,  scale: 2

This is my Row in the Database table (name is wallet). How can I populate it with data in the rails console?

I have tried

wallet.eur=10 Ok this one is to easy and doesnt work.

wallet.eur=BigDecimal.new('154.00') This one throws something like => #<BigDecimal:56cadb8,'0.154E3',9(18)> But i cant save it and will stay at 0.0.

Any Idea or suggestion?

Answer 1

If dealing with currency maybe money-rails gem might be worthwhile?

Or something similar just using an integer and storing it in pence/cents and creating helpers to display it.

Plays much nicer than using decimal or worse float.

Answer 2

Use the built-in rails facilities, check the NumberHelper documentation for examples.

Use this code to add the migration:

add_column :items, :price, :decimal, :precision => 8, :scale => 2

and then use this method:

number_to_currency(price, :unit => "€")

If you've got an NoMethodError add this line:

include ActionView::Helpers::NumberHelper