Class: Goliath::Rack::Validation::DefaultParams

Inherits:
Object
  • Object
show all
Defined in:
lib/goliath/rack/validation/default_params.rb

Overview

A middleware to validate that a parameter always has a value

Examples:

use Goliath::Rack::Validation::DefaultParams, {:key => 'order', :defaults => 'pubdate'}

Instance Method Summary collapse

Constructor Details

#initialize(app, opts = {}) ⇒ Goliath::Rack::Validation::DefaultParams

Called by the framework to create the validator

Parameters:

  • app —

    The app object

  • opts (Hash) (defaults to: {}) —

    The options hash

Options Hash (opts):

  • :key (String) —

    The key to access in the parameters

  • :defaults (Object) —

    The default value to assign if the key is empty or non-existant

Raises:

  • (Exception) 


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# File 'lib/goliath/rack/validation/default_params.rb', line 17

def initialize(app, opts = {})
  @app = app
  @defaults = opts[:defaults]
  raise Exception.new("Must provide defaults to DefaultParams") if @defaults.nil?

  @key = opts[:key]
  raise Exception.new("must provide key to DefaultParams") if @key.nil? || @key =~ /^\s*$/
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/goliath/rack/validation/default_params.rb', line 26

def call(env)
  if !env['params'].has_key?(@key) || env['params'][@key].nil?
    env['params'][@key] = @defaults

  elsif env['params'][@key].is_a?(Array) && env['params'][@key].empty?
    env['params'][@key] = @defaults

  elsif env['params'][@key].is_a?(String)
    if env['params'][@key] =~ /^\s*$/
      env['params'][@key] = @defaults
    end
  end

  @app.call(env)
end