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---
title: "Validations"
id: validations
---
In Rails, forms usually have an associated model object. Models define validations which include validation messages that describe which validations failed and why. Primer forms automatically display validation messages when a model object is provided.
## Custom validation messages
All form inputs allow overriding the default validation message via the `:validation_message` argument:
<%= code :ruby do %>
class ExampleForm < ApplicationForm
form do |example_form|
example_form.text_field(
name: :foo,
label: "Foo",
validation_message: "Custom validation message"
)
end
end
<% end %>
A custom validation message is also useful if no associated model object is available, i.e. for forms that are not tied to a database table.
## Input focus
Primer forms will automatically focus the first invalid input in accordance with accessibility best-practices. Inputs are considered invalid if the associated model's field is invalid _or_ if a custom validation message has been provided.
Version data entries
140 entries across 140 versions & 2 rubygems