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# como fazer a função update:
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```javascript
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exports.update = function(req, res) {
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// Validate input, in our case we will recive a json if
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// all changeable informations, in activity's
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// perspective we to recive the ID of activity and the
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// description, so, we check if its not blank
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if(!req.params.activityId) {
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return res.status(400).send({
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message: "Acitivity's ID cannot be empty"
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});
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}
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if(!req.body.description) {
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return res.status(400).send({
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message: "Activity's description cannot be empty"
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});
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}
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// Normally on our project we are using await/async
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// but in that case is pretty simple to use the standart promise
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// so, without await/async but with just then at the and of a function
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AcitivityModel.update(
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{ description: req.body.description },
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{ where: { id: req.params.activityId } }
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).then(function(updateStatus) {
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// First of all, what happens above:
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// update is a function that recives two parameters and returns a update status
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// the first of those two parameters is: a map of column: newValue that should be updated
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// the second one is: a map with your where clause
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// its update status return is a array if just one position, where 0 extends for failure
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// and 1 for success
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// Now, about the promises, when we finish a function we can add a .then at its end
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// making the "then" function just happen after our main function, we also can take
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// whatever the main function send back to the caller, so, we have a new function
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// reciving the 'updateStatus' that was the result from the update
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if(updateStatus[0] === 0) {
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// 0 means failure, so throw a error
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return res.status(404).send({
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message: "Acitivity not found with ID " + req.params.activityId + "."
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});
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} else if(updateStatus[0] === 1) {
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// 1 means success, so throw a success message
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return res.status(200).send({
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message: "Acitivity with ID equals to " + req.params.activityId + " updated successfully."
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});
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} else {
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// Just to be sure that non special situation might pass
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return res.status(500).send({
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message: "Error updating activity with ID " + req.params.activityId + "."
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});
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}
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}).catch(function(err) {
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// Checking anykind of exceptions
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if(err.kind === 'ObjectId') {
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return res.status(404).send({
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message: "Acitivity not found with ID " + req.params.activityId + "."
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});
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}
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return res.status(500).send({
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message: "Error updating activity with ID " + req.params.activityId + "."
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});
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});
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};
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``` |
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\ No newline at end of file |
