Template variables

Template variables are placeholder tokens in your .surql schema files that SurrealKit substitutes with actual values at runtime. A single set of schema files can then cover all environments (development, staging, production) with names, prefixes, or other values varying per environment.

Syntax

Use ${VAR_NAME} anywhere in a .surql file:

-- database/schema/roles.surql
DEFINE ROLE ${talent_role} PERMISSIONS FULL;

-- database/schema/tables.surql
DEFINE TABLE ${schema_prefix}_orders SCHEMAFULL;
DEFINE FIELD owner ON ${schema_prefix}_orders TYPE record<user>;

Variable names are case-insensitive: ${FOO}, ${foo}, and ${Foo} all match the key FOO.

If a variable is referenced in a file but has no value configured, SurrealKit exits with an error and a clear message indicating which variable is missing.

Resolution order

SurrealKit resolves variable values in the following order (first match wins):

1. CLI flag: --var KEY=VALUE (repeatable)

2. Environment variable: SURREALKIT_VAR_<KEY> (case-insensitive key matching)

3. surrealkit.toml [variables] section

CLI flags

surrealkit sync --var schema_prefix=acme --var talent_role=talent_rw
surrealkit rollout start my_rollout --var schema_prefix=acme

Environment variables

export SURREALKIT_VAR_SCHEMA_PREFIX=acme
export SURREALKIT_VAR_TALENT_ROLE=talent_rw
surrealkit sync --user root --pass secret

surrealkit.toml

[variables]
schema_prefix = "myapp"
talent_role = "talent_rw"
environment = "development"

Place surrealkit.toml in the root of your project. It is read automatically.

Escaping

To emit a literal ${...} string in generated SQL (for example, inside a SurrealQL string value), double the dollar sign:

SET note = 'pass $${MY_VAR} literally';

SurrealKit outputs this as pass ${MY_VAR} literally without substitution.

Which commands apply substitution

Template Variables are substituted when applying schema to a database. They are not substituted in commands that only read or plan:

Known limitations

Hash-based re-sync: SurrealKit tracks files by content hash. Changing a variable value without editing the file will not trigger a re-sync. Touch the file to force re-application:

touch database/schema/tables.surql
surrealkit sync --user root --pass secret

Watch mode: Variables in surrealkit.toml are resolved once at startup. If you edit surrealkit.toml while --watch is running, restart SurrealKit for the new values to take effect. Variables passed via --var or environment variables are re-read on each sync cycle.

Catalog snapshots: Entity names containing ${VAR} appear literally (without substitution) in catalog_snapshot.json. This is cosmetic and does not affect functionality.

String literals: Substitution is purely textual. ${VAR} inside a SurrealQL string is replaced with the variable's value, which may or may not be the intended behaviour. Test carefully when embedding variables inside string literals.