In my model I have:
validate :my_custom_validation
def my_custom_validation
errors.add_to_base("error message") if condition.exists?
end
I would like to add some parameters to mycustomer vaildation like so:
validate :my_custom_validation, :parameter1 => x, :parameter2 => y
How do I write the mycustomvalidation function to account for parameters?
Validators usualy have an array parameter indicating, first, the fields to validate and lastly (if it exists) a hash with the options. In your example:
:my_custom_validation, parameter1: x, parameter2: y
:my_custom_validation would be a field name, while parameter1: x, parameter2: y would be a hash:
{ parameter1: x, parameter2: y}
Therefore, you'd do something like:
def my_custom_validation(*attr)
options = attr.pop if attr.last.is_a? Hash
# do something with options
errors.add_to_base("error message") if condition.exists?
end
You can just do something like this:
def validate
errors.add('That particular field', 'can not be the value you presented') if !self.field_to_check.blank? && self.field_to_check == 'I AM COOL'
end
No need to call reference it, as I believe the validate method is processed (if it exists) after any validates_uniqueness_of -like validations.
Added: More information in the Rails API docs here.
You should also be able to use a Ruby lambda to help with method based validation of your model attributes (x, y) like below:
validate -> { my_custom_validation(parameter1: x, parameter2: y) }
