in lib/facebook_ads/param_set.rb [37:54]
def to_params(data)
Hash[data.map do |key,val|
key = key.to_sym
field_type = @params[key]
if (!field_type && accepts_files? && FieldTypes::UploadFile.acceptable?(val))
field_type = FieldTypes::UploadFile.new
end
if (!field_type && val.is_a?(Array))
val = JSON.generate(val)
end
[key, (field_type ? field_type.serialize(val) : val)]
end]
end