fn validate_connection_metadata()

in compiler/crates/relay-transforms/src/refetchable_fragment/mod.rs [263:307]

• 45 lines of code
• 11 McCabe index (conditional complexity)

    fn validate_connection_metadata(&self, fragment: &FragmentDefinition) -> DiagnosticsResult<()> {
        if let Some(metadatas) = extract_connection_metadata_from_directive(&fragment.directives) {
            // TODO: path or connection field locations in the error messages
            if metadatas.len() > 1 {
                return Err(vec![Diagnostic::error(
                    ValidationMessage::RefetchableWithMultipleConnections {
                        fragment_name: fragment.name.item,
                    },
                    fragment.name.location,
                )]);
            } else if metadatas.len() == 1 {
                let metadata = &metadatas[0];
                if metadata.path.is_none() {
                    return Err(vec![Diagnostic::error(
                        ValidationMessage::RefetchableWithConnectionInPlural {
                            fragment_name: fragment.name.item,
                        },
                        fragment.name.location,
                    )]);
                }
                if (metadata.after.is_none() || metadata.first.is_none())
                    && metadata.direction != self.connection_constants.direction_backward
                {
                    return Err(vec![Diagnostic::error(
                        ValidationMessage::RefetchableWithConstConnectionArguments {
                            fragment_name: fragment.name.item,
                            arguments: "after and first",
                        },
                        fragment.name.location,
                    )]);
                } else if (metadata.before.is_none() || metadata.last.is_none())
                    && metadata.direction != self.connection_constants.direction_forward
                {
                    return Err(vec![Diagnostic::error(
                        ValidationMessage::RefetchableWithConstConnectionArguments {
                            fragment_name: fragment.name.item,
                            arguments: "before and last",
                        },
                        fragment.name.location,
                    )]);
                }
            }
        }
        Ok(())
    }