Number

The number field renders an input[type="number"] element in forms and displays numeric values on the Index and Show views.

# app/avo/resources/user.rb
field :age, as: :number

By default, values are unformatted and Avo sets no minimum, maximum, or step constraint.

Limit the input range

For a bounded value such as an age, set min and max. Set step to control valid increments:

# app/avo/resources/user.rb
field :age, as: :number, min: 0, max: 120, step: 5

These are browser input constraints, not model validations. Add model validations when the limits must also be enforced on the server. Leaving step unset lets the browser apply its default step behavior; it does not enable arbitrary decimal input.

Formatting numbers

Use format for the common display formats provided by Rails:

# app/avo/resources/statistic.rb
field :population, as: :number, format: :delimited
field :margin, as: :number, format: :percentage
field :downloads, as: :number, format: :human

The punctuation and wording come from Rails i18n, so delimiters and decimal separators follow the current locale.

There is no :currency format. For monetary values use the money field, which handles the currency itself, or reach for format_display_using below.

On the Index view, formatted numbers and their headers are end-aligned. Bare number fields remain unformatted and start-aligned, which is useful for identifier- or year-shaped values. All number columns use tabular figures so their digits line up between rows.

For formatting that these three values do not cover, use format_display_using. Rails helpers are available directly inside the block:

# app/avo/resources/product.rb
field :price_in_cents,
  as: :number,
  format_display_using: -> { number_to_currency(value / 100.0) }

format_display_using affects only Index and Show, so the Edit and New inputs keep a valid raw numeric value. A custom display formatter takes precedence when it is combined with format.

Link a number to its record

On the Index view, set link_to_record: true to make the displayed number a link to the record. See common field options for linking, placeholders, and shared display formatters.