Ionic 2 and firebase database


I would like to know the method to push items into the firebase database only if not exist.
And something more. Do you know any good tutorial for ionic 2 and firebase?

Thank you very much

Check out the blog posts of javebratt, and the Firebase YouTube channel. You want stuff about Ionic 2 RC(any) and Firebase 3. Earlier material is outdated. (Once you know what has changed, there are good ideas in earlier blog posts by a lot of different authors. But it will be confusing at the start.)

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