Problem finding in a collection

soluciones_controller.rb

def index
#Connecting with SFDC
	config = YAML.load_file(File.join(::Rails.root, 'config', 'databasedotcom.yml'))
	client = Databasedotcom::Client.new(config)          
	client.authenticate :username => config[:username], :password => config[:password]
#Get a collection of Solutions and stored in a var visible for all the methods	
        @@sols = client.query("SELECT Soluci_n_Hija__r.Id,
				      Soluci_n_Hija__r.SolutionName,
				      Soluci_n_Hija__r.NumeroVisitas__c,
				      Soluci_n_Hija__r.Contenido__c,
				      Soluci_n_Hija__r.Tipo__c,
				      Soluci_n_Padre__r.Id 
				      FROM Solution_Rel__c 
				      where Soluci_n_Hija__r.RecordTypeId='012D0000000BBCQ'")
#Find the top 3 solutions more visited
	@masvisitadas= @@sols.sort_by{|s| -s.Soluci_n_Hija__r.NumeroVisitas__c}[0..2]
#Find solutions of first level in the tree, his parent.Id is the parent of all solutions
	@listasol=@@sols.find{|a| a.Soluci_n_Padre__r.Id  == '50120000000bF8fAAE' }
#Find the solutions of the second level, any that have a parent in listasol
	@listasollvl=@@sols.find{|a| a.Soluci_n_Padre__r.Id in [@listasol.Soluci_n_Hija__r.Id]}
end