Ruby on Rails merging data in Mongoid

@all_models = Model.all 
data_to_database.each do |line|
    keys_for_database = line["My_Key"]
    
if @all_models.(keys_for_database => line).exists?
    
 Вот здесь я не знаю как сделать что бы Mongoid делала merge {keys_for_database => line}.merge with existing {keys_for_database => line}
 
else
    Model.create!(keys_for_database => line)
end
end

all_models = Model.all 
data_to_database.each do |line|
    keys_for_database = line["My_Key"]
 
if @all_models.find(keys_for_database => line).include?(line)
 
 @all_models.find(keys_for_database => line).merge!(line)
 
else
    Model.create!(keys_for_database => line)
end
end

@all_models = Model.all 
data_to_database.each do |line|
    keys_for_database = line["My_Key"]
    
if @all_models.find(keys_for_database => line).include?(line)
    
 @all_models.find(keys_for_database => line).merge!(line)
 
else
    Model.create!(keys_for_database => line)
end
end

if @all_models.find(keys_for_database).include?(x)

undefined method `find' for nil:NilClass