Perform One Validation Only If All Other Validations Pass

perform one validation only if all other validations pass

You could check the errors array and return.

def check_valid_bank_account
  return unless errors.blank?
  …
end

Adding validation rule only if all other rules pass, or stop validating entire set of attributes on the first error in Laravel 5.7

I have finally found the solution myself. Here is what I ended up with.

To achieve the desired result I created another validator in withValidator() method of my custom form request, this second validator will handle only the FolderExists rule and only if the previous validation fails.

public function rules()
    {
        return [
            'asset-id' => ['bail', 'required', 'integer', 'exists:assets,id'],
            'relative-path' => ['bail', 'required', 'string'],
            'new-folder-name' => ['bail', 'required', 'string', 'min:3', 'max:150', new FolderName]
        ];
    }

public function withValidator($validator)
    {
        if (!$validator->fails())
        {
            $v = Validator::make($this->input(),[
                'new-folder-name' => [new FolderExists($this->input('asset-id'), $this->input('relative-path'))]
            ]);
            $v->validate();
        }
    }

If our main validator passes, we make another validator and pass only FolderExists rule with its arguments, that have already been validated, and call validate() method. That's it.

Running rails inclusion validation only if presence passes

pass in an if inside the inclusion option to check for the presence

validates :segment_type,
  presence: true,
  inclusion: { in: SEGMENT_TYPES, if: :segment_type_present? }

private

def segment_type_present?
  segment_type.present?
end

you can also use a proc

inclusion: { in: SEGMENT_TYPES, if: proc { |x| x.segment_type.present? } }

Rails - Validation :if one condition is true

You can use a lambda for the if: clause and do an or condition.

validates :description, presence: true, if: -> {current_step == steps.first || require_validation}

Need to run the validation one after check another on Rails

You can use a Proc here:

validates :email, :presence
validates_format_of :email, with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i, message: 'Invalid email address', :if => Proc.new { |o| o.errors.empty? }
validates_uniqueness_of :email, case_sensitive: false, message: 'Email has already been entered', :if => Proc.new { |o| o.errors.empty? }

Validate presence of field only if another field is blank - Rails

You don't need a lambda. This will do:

validates_presence_of :mobile_number, :unless => :home_phone?

Also, all of the validators take the same if/unless options, so you can make them conditional at will.

Update: Looking back at this answer a few days later, I see that I should explain why it works:

• If you set a validator's :unless option to be a symbol, Rails will look for an instance method of that name, invoke that method on the instance that's being validated -- at validation time -- and only perform the validation if the method returns false.
• ActiveRecord automatically creates question mark methods for each of your model's attributes, so the existence of a home_phone column in your model's table causes Rails to create a handy #home_phone? method. This method returns true if and only if home_phone is present (i.e. not blank). If the home_phone attribute is nil or an empty string or a bunch of white space, home_phone? will return false.

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UPDATE: Confirmed that this old technique continues to work in Rails 5.

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