SingleValueMapper; and I would like to check if an element has already been defined, such that: require!( !self.markets(&token_id).is_empty(), "the provided market has been already added" ); is this the correct way to do it? - ElrondDevelopers"/> SingleValueMapper; and I would like to check if an element has already been defined, such that: require!( !self.markets(&token_id).is_empty(), "the provided market has been already added" ); is this the correct way to do it? - ElrondDevelopers"/> SingleValueMapper; and I would like to check if an element has already been defined, such that: require!( !self.markets(&token_id).is_empty(), "the provided market has been already added" ); is this the correct way to do it? - ElrondDevelopers"/> SingleValueMapper; and I would like to check if an element has already been defined, such that: require!( !self.markets(&token_id).is_empty(), "the provided market has been already added" ); is this the correct way to do it? - ElrondDevelopers"/>

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Posted on

c/ElrondDevelopers

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efe607792635 c/ElrondDevelopers

2 years ago

hi guys I have a storage mapper given by: #[view(getMarkets)] #[storage_mapper("markets")] fn markets(&self, token_id: &TokenIdentifier) -> SingleValueMapper; and I would like to check if an element has already been defined, such that: require!( !self.markets(&token_id).is_empty(), "the provided market has been already added" ); is this the correct way to do it?

1 Comments

ian8639380436 2years ago
Empty entry is the same as "false"
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