Attempting to get spreadsheets from google drive using google api client

google_drive.rb

require 'google/api_client'
require 'launchy'
load 'auth.rb'

def client
  @client
end

def drive
  @drive
end

def session
  unless client
    @client = Google::APIClient.new
    @drive = client.discovered_api('drive', 'v2')
    client.authorization.client_id = client_id
    client.authorization.client_secret = secret
    client.authorization.scope = 'https://www.googleapis.com/auth/drive'
    client.authorization.redirect_uri = 'urn:ietf:wg:oauth:2.0:oob'

    uri = client.authorization.authorization_uri
    Launchy.open(uri)
    $stdout.write  "Enter authorization code: "
    client.authorization.code = gets.chomp
    client.authorization.fetch_access_token!
  end
  client
end

#application/vnd.google-apps.spreadsheet
def list_files
  session
  files = []
  # no matter how i go about trying to filter i always get all my docs...
  params = "'mimeType' = 'application/vnd.google-apps.spreadsheet' and 'trashed' = false"
  params = {'query' => {'mimeType' => 'application/vnd.google-apps.spreadsheet', 'trashed' => false}}
  params = {'q' => {'mimeType' => 'application/vnd.google-apps.spreadsheet', 'trashed' => false}}
  params = {'q' => "'mimeType' = 'application/vnd.google-apps.spreadsheet' and 'trashed' = false"}
  params = {'mimeType' => 'application/vnd.google-apps.spreadsheet', 'trashed' => false}
  begin
    rsp = client.execute :api_method => drive.files.list, :parameters => params
    #rsp = client.execute :api_method => drive.files.list, :q => params  # have tried as well
    files += rsp.data.items
    puts "Token was #{params['pageToken']} but now #{rsp.next_page_token}"
    params['pageToken'] = rsp.next_page_token unless rsp.next_page_token.nil?
  end while !rsp.next_page_token.nil?
  files
end

The correct way to do the query is

params = {'q' => "mimeType = 'application/vnd.google-apps.spreadsheet' and trashed = false"}