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Put "repair_empty_param_associations" in your before filters in the application_controller.rb

View rails 3.2.11 params patch
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def repair_empty_param_associations
params.keys.each do |key|
repair_nested_params(params, key, params[key])
end
end
 
private
 
def repair_nested_params(current_params, key, value)
if key =~ /^(.*)_attributes$/ && value.nil?
current_params[key] = []
elsif value.is_a? Hash
value.keys.each do |nested_key|
repair_nested_params(value, nested_key, value[nested_key])
end
end
end
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