#actioncontrollerparameters

New Post has been published on http://www.rortuts.com/ruby-on-rails/rails5-actioncontrollerparameters/

Rails 5: ActionController::Parameters

Rails 5: ActionController::Parameters Now Returns an Object Instead of a Hash.

Lot’s of people got confused. What was that?

So here is a small presentation which will quickly dive into it.

rails 4

raw_parameters = :name => 'rockers',:teams => :team1 => "37" parameters = ActionController::Parameters.new(raw_parameters) parameters # => "name"=>"rockers", "teams"=>"tet", "city"=>"Los Angeles" parameters.to_h # => "teams"=>"team1"=>"37" parameters.slice(:name,:city).to_h # => "name"=>"rockers", "city"=>"Los Angeles" parameters.to_unsafe_h.slice(:name, :city)

  Rails 5

raw_parameters = :name => 'rockers',:teams => :team1 => "37",:city => 'delhi' parameters = ActionController::Parameters.new(raw_parameters) parameters # => <ActionController::Parameters "name"=>"rockers", "teams"=>"team1"=>"37" permitted: false> parameters.to_h # => parameters.slice(:name,:city).to_h # => Calling #to_h on this would return an empty hash because name and city aren’t permitted. parameters.to_unsafe_h.slice(:name, :city) # => "name"=>"et", "city"=>"Los Angeles"

  Note1: By default controller and action parameters are allowed. To explicitly always allow other parameters you can set a configuration option in your application.rb config.always_permitted_parameters = %w( controller action param_1 param_2 )

Note2: this doesn’t affect accessing the keys in the params hash like params[:city]. You can view the Pull Request that implemented this change.

Some Code Snippets for Rails5.:

Json API

def create photos = [] photo_params.each do |p| photo = Photo.new(p) photos << photo if photo.save end render json: photos, status: 201 end def photo_params params.require(:photos).map do |p| ActionController::Parameters.new(p.to_hash).permit(:title, :src) end

  Mandrill inbound webhooks

params = ActionController::Parameters.new( mandrill_events: [ msg: name: 'Francesco', age: 22, role: 'admin' , msg: name: 'steve', age: 22, role: 'admin' ] ) permitted = params.require(:mandrill_events).map # => ["name"=>"Francesco", "age"=>22, "name"=>"steve", "age"=>22]

Params hash in RSpec in Rails 5?

expect_any_instance_of(Hospital).to receive(:update).with(ActionController::Parameters.new('name':'MyString'))

Hey Guys! Hope you enjoyed this session :).If you like it then please share and let us know your views as well, we will try to answer your quetions.