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The provided withTransaction and withSession helpers make running transactions very simple, but it's difficult to get the results of the operation back.
Both functions take a lambda as an argument that must return a Promise, but the functions don't pass through the value that the promise resolves to. This means that I need to create a wrapper function like this in order to get the return value:
runTransaction(writeFunc) {
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let writeResults = null;
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const txnFunc = session => (
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writeFunc(session)
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.then((results) => { writeResults = results; })
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);
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return this.client.withSession(session => session.withTransaction(txnFunc)))
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.then(() => {
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return writeResults;
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});
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}
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It's not the end of the world, but it would be nice if these functions could just pass through the results.
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