Hash guidestyle

hash_style.rb

# I'm trying to search the 'cleanest' solution to create an hash. 
# The different guidestyles I've found around does not satisfy me at all. 
# Tell me which ones you like between those options


  # solution 1 (favorite at the moment)
  let!(:params) do
    { response_type: 'code',
      client_id:     application.id.to_s,
      redirect_uri:  application.redirect_uri,
      scope:         'public write',
      state:         'remember-me' }
  end

  # solution 2
  let!(:params) do
    { 
      response_type: 'code',
      client_id:     application.id.to_s,
      redirect_uri:  application.redirect_uri,
      scope:         'public write',
      state:         'remember-me' 
    }
  end

  # solution 3
  let!(:params) do
    Hash[ response_type: 'code',
          client_id:     application.id.to_s,
          redirect_uri:  application.redirect_uri,
          scope:         'public write',
          state:         'remember-me' ]
  end

  # solution 4
  let!(:params) do
    Hash[ 
      response_type: 'code',
      client_id:     application.id.to_s,
      redirect_uri:  application.redirect_uri,
      scope:         'public write',
      state:         'remember-me' 
    ]
  end