Rails 3. How to Display Two Decimal Places in Edit Form

Rails 3. How to display two decimal places in edit form?

You should use number_with_precision helper. See doc.

Example:

number_with_precision(1.5, :precision => 2)
=> 1.50 

Within you form helper:

<%= f.text_field :cost, :class => 'cost', :value => (number_with_precision(f.object.cost, :precision => 2) || 0) %>

BTW, if you really want to display some price, use number_to_currency, same page for doc (In a form context, I'd keep number_with_precision, you don't want to mess up with money symbols)

---

Rails 3. How to explicitly round a number to two decimal places in the model?

You should try using the :decimal type of database field, with the :scale set to 2

To add a decimal column to a new table;

create_table :my_table do |t|
  t.decimal :my_column, :scale => 2
end

To add a column to an existing table;

add_column :my_table, :my_column, :decimal, :scale => 2

It is wise to have precisions since some database does not have precision defaults. Such as postgresql:

 add_column :my_table, my_column, precision: 30, scale: 2

Displaying an output in Ruby to 2 decimal places

You have to add a dot in the format to say you want the 2 to be the precision after the decimal dot:

s = '%.2f' % @price

Rails currency with 2 decimal

You could use a helper called: number_with_precision

it would look like this:

<p class="price"><%= number_with_precision(product.price_with_currency, :precision => 2) %></p>

read more here: Rails 3. How to display two decimal places in edit form?

Can't get decimals to display in text field for Rails 3

Try this

f.text_field :purchase_price, :value=>number_to_currency(f.object.purchase_price, :unit=>'')

That should convert the number to a currency (with two decimal places) and the :unit=>'' will exclude the "$".

And I'd recommend removing your custom purchase_price method and using the number_to_currency helper where needed instead. Overriding the purchase_price accessor isn't a bad idea but it could confuse some things that might be expecting a number rather than a string.

How to specify decimal precision in a simple_form number field (Rails)

If you can do it with formtastic you can usually do it with Simple Form in my experience. Try this:

<%= f.input :sales_price, :input_html => {value: number_with_precision(f.object.sales_price, precision: 2) } %>

If using an input_field, then you don't need the :input_html:

<%= f.input_field :sales_price, value: number_with_precision(f.object.sales_price, precision: 2) %>

Saving a number with specific decimal places to a variable

The method number_with_precision is a helper method for views only, and it returns a string version of the number. It doesn't return a number with the specified precision, if that's what you're looking for. The good news is, if you want exactly what number_with_precision gives you, you can use sprintf.

sprintf('%.2f', 3.1415926)    # result: "3.14"

sprintf returns a value you can store, instead of printing to stdout like printf does. So you can easily capture it:

number = sprintf('%.2f', 3.1415926)

If you wanted to treat it as a number, you could probably build a class that does this for you, and converts to and from a Float as needed.

---

Related Topics