when using firebase cloud function, let say if I want to insert some field into the firebase, I use ref.child().set(), but when I want to update the child, I can use both ref.child().update() and ref.child().set(). Is that a correct way to use ref.child().set() to update the field if the field is existed and to insert the field if the field is not exist? Because if I use ref.child().update(), I need to make sure the field data is inside the firebase. Thank you?
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There is no difference in writing the initial value of a node and updating it. Both can be accomplished with either set() or update().
The difference between ref.set(...) and ref.update({...}) is that the first replaces everything that currently exists at ref, while the second updates only the keys/paths that are specified in the parameters.
I highly recommend checking out the documentation on updating nodes for an example.
answered Feb 23, 2018 at 18:23
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