Module: Fend::Plugins::Contexts

Defined in:

lib/fend/plugins/contexts.rb

Overview

‘contexts` plugin adds support for contextual validation, which basically means you can branch validation logic depending on provided context.

class UserValidation < Fend
  plugin :contexts

  validate do |i|
    i.params(:account_type) do |acc_type|
      context(:admin) do
        acc_type.validate_equality("admin")
      end

      context(:editor) do
        acc_type.validate_equality("editor")
      end

      # you can check context against multiple values
      context(:visitor, :demo) do
        acc_type.validate_equality(nil)
      end
    end
  end
end

You can pass the context on initialization

user_validation = UserValidation.new(context: :editor)
user_validation.call(account_type: "invalid").messages
#=> { account_type: ["must be equal to 'editor'"] }

‘#context` can be called anywhere in the validation block. You can also specify contextual params

validate do |i|
  context(:admin) do
    i.params(:admin_specific_param) do |asp|
      # ...
    end
  end

  context(:editor) do
    i.params(:editor_specific_param) do |esp|
      # ...
    end
  end
end

## Default context

If no context is provided, context will be set to ‘:default`

context(:default) do
  # default validation logic
end

## Overriding constructor

Since context value is set in the constructor, you should always call ‘super` when/if overriding it.

Defined Under Namespace

Modules: InstanceMethods