Customise message for validates_uniqueness_of

Rails
1

I am trying to convert an integer to a DAYNAME in my validation message

validates_uniqueness_of :day, scope: :store, :message => “already has a
target for #{Date::DAYNAMES[self.day]}.”

This does not seem to work, I cannot access the day value.
The following displays the correct value

validates_uniqueness_of :day, scope: :store, :message => “already has a
target for %{value}.”

This throws an error:

validates_uniqueness_of :day, scope: :store, :message => “already has a
target for #{Date::DAYNAMES[%{value}]}.”

Any help would be Amazing!

2

On Friday, 25 July 2014 23:21:08 UTC-4, Ricky Hopkins wrote:

target for %{value}."

This throws an error:

validates_uniqueness_of :day, scope: :store, :message => “already has a
target for #{Date::DAYNAMES[%{value}]}.”

Using double quotes with #{} will definitely not do what you want; the
interpolation will be attempted at class-load time, not when the string
is
needed.

The value passed to :message is handed off to I18n.translate, so the
docs
for that may be some help.

It may be easier (and clearer) to just define a custom validation
function
that does what you want.

–Matt J.

3

This is along the lines of what Matt is referring to.

class DayValidator < ActiveRecord::Validator
def validate()
if YOUR_TEST_FOR_INVALIDITY(record.day)
date = Date::DAYNAMES[record.day]
record.errors[:day] << “already has a target #{date}”
end
end
end

class YourClass < ActiveRecord::Base
validates_with DayValidator
end