IF_NOT_EXISTS mapper option for SAVE queries.#677
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Yeah, it is the same. Sorry, missed it out. I'd love to see any of those in next release :) |
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Closing in favor of #626 then. |
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Added IF_NOT_EXISTS mapper option for save operations.
Useful in cases when you want to insert something atomically, but you are not sure it exists or not. And your app logic actually depends on whether it was inserted or not.
You still can build Insert by hands, but this way looks much much prettier.
For example, user registration process, your User table has PrimaryKey
username. You try to register user, but if 'it exists', e.g. wasApplied returned false - you tell about that on UI with error/warning "User already exists". Until try to insert, you'd never know that.