answers.coffee
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	class @Answer
	constructor: (doc) ->
	_.extend this, doc

	@Answers = new Meteor.Collection("answers",
	transform: (doc) ->
	new Answer(doc)
	)

	Answers.before.insert BeforeInsertTimestampHook
	Answers.before.update BeforeUpdateTimestampHook

	Meteor.methods
	"upsertAnswer": (answer) ->
	check(answer.visitId, String)
	visit = Visits.findOne
	_id: answer.visitId
	throw new Meteor.Error(403, "visit can't be found.") unless visit?

	patient = Patients.findOne
	_id: visit.patientId
	throw new Meteor.Error(403, "patient can't be found.") unless patient?
	throw new Meteor.Error(433, "you are not allowed to upsert answers") unless Roles.userIsInRole(@userId, ['admin']) or (Roles.userIsInRole(@userId, 'therapist') and patient.therapistId is @userId)

	check(answer.questionId, String)
	question = Questions.findOne
	_id: answer.questionId
	throw new Meteor.Error(403, "question can't be found.") unless question?

	questionnaire = Questionnaires.findOne
	_id: question.questionnaireId
	throw new Meteor.Error(403, "questionnaire can't be found.") unless questionnaire?
	#TODO check if questionnaire is scheduled at visit

	answerId = null
	if answer._id?
	a = Answers.findOne _.pick answer, 'visitId', 'questionId', '_id'
	throw new Meteor.Error(403, "answer to update can't be found.") unless answer?

	Answers.update answer._id,
	$set:
	value: answer.value
	answerId = answer._id
	else
	answer = _.pick answer, 'visitId', 'questionId', 'value'
	answerId = Answers.insert answer

	if !patient.hasData
	Patients.update patient._id,
	$set: hasData: true

	return answerId