feat: add schemars support

benzina/Cargo.toml

@@ -14,6 +14,7 @@ features = [
     "postgres",
     "mysql",
     "serde",
+    "schemars",
     "typed-uuid",
     "example-generated",
     "dangerous-construction",
@@ -26,6 +27,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 diesel = { version = "2.3", default-features = false, optional = true }
 serde_core = { version = "1.0.221", optional = true }
 serde_json = { version = "1.0.144", optional = true }
+schemars = { version = "1", default-features = false, optional = true }
 utoipa = { version = "5", optional = true }
 benzina-derive = { path = "../benzina-derive", version = "=0.4.4", optional = true }
 uuid = { version = ">=0.7.0, <2.0.0", default-features = false, optional = true }
@@ -47,6 +49,7 @@ typed-uuid = ["postgres", "diesel/uuid", "dep:uuid"]
 mysql = ["benzina-derive?/mysql"]
 
 serde = ["dep:serde_core", "uuid?/serde"]
+schemars = ["dep:schemars"]
 utoipa = ["dep:utoipa"]
 
 example-generated = ["typed-uuid"]

benzina/src/lib.rs

@@ -31,6 +31,8 @@ pub mod example_generated;
 mod int;
 #[cfg(feature = "json")]
 mod json;
+#[cfg(all(feature = "schemars", feature = "postgres"))]
+mod schemars;
 #[cfg(all(feature = "serde", feature = "postgres"))]
 mod serde;
 #[cfg(feature = "postgres")]

benzina/src/schemars.rs

@@ -0,0 +1,32 @@
+use std::borrow::Cow;
+
+use schemars::{JsonSchema, Schema, SchemaGenerator, json_schema};
+
+use crate::{U15, U31, U63};
+
+macro_rules! impl_schemars_numbers {
+    ($($type:ident => $format:literal),*) => {
+        $(
+            impl JsonSchema for $type {
+                fn schema_name() -> Cow<'static, str> {
+                    stringify!($type).into()
+                }
+
+                fn json_schema(_: &mut SchemaGenerator) -> Schema {
+                    json_schema!({
+                        "type": "integer",
+                        "format": $format,
+                        "minimum": $type::MIN.get(),
+                        "maximum": $type::MAX.get()
+                    })
+                }
+            }
+        )*
+    }
+}
+
+impl_schemars_numbers! {
+    U15 => "int16",
+    U31 => "int32",
+    U63 => "int64"
+}