surrealdb/sql/statements/
output.rs

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use crate::ctx::Context;
use crate::dbs::{Options, Transaction};
use crate::doc::CursorDoc;
use crate::err::Error;
use crate::sql::fetch::Fetchs;
use crate::sql::value::Value;
use derive::Store;
use revision::revisioned;
use serde::{Deserialize, Serialize};
use std::fmt;

#[derive(Clone, Debug, Default, Eq, PartialEq, PartialOrd, Serialize, Deserialize, Store, Hash)]
#[revisioned(revision = 1)]
pub struct OutputStatement {
	pub what: Value,
	pub fetch: Option<Fetchs>,
}

impl OutputStatement {
	/// Check if we require a writeable transaction
	pub(crate) fn writeable(&self) -> bool {
		self.what.writeable()
	}
	/// Process this type returning a computed simple Value
	pub(crate) async fn compute(
		&self,
		ctx: &Context<'_>,
		opt: &Options,
		txn: &Transaction,
		doc: Option<&CursorDoc<'_>>,
	) -> Result<Value, Error> {
		// Ensure futures are processed
		let opt = &opt.new_with_futures(true);
		// Process the output value
		let mut val = self.what.compute(ctx, opt, txn, doc).await?;
		// Fetch any
		if let Some(fetchs) = &self.fetch {
			for fetch in fetchs.iter() {
				val.fetch(ctx, opt, txn, fetch).await?;
			}
		}
		//
		Ok(val)
	}
}

impl fmt::Display for OutputStatement {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		write!(f, "RETURN {}", self.what)?;
		if let Some(ref v) = self.fetch {
			write!(f, " {v}")?
		}
		Ok(())
	}
}