Add #[schemars(inner(...)] attribute to specify schema for array items (#234)

schemars/examples/schemars_attrs.rs

@@ -10,6 +10,8 @@ pub struct MyStruct {
     pub my_bool: bool,
     #[schemars(default)]
     pub my_nullable_enum: Option<MyEnum>,
+    #[schemars(inner(regex(pattern = "^x$")))]
+    pub my_vec_str: Vec<String>,
 }
 
 #[derive(Deserialize, Serialize, JsonSchema)]

schemars/examples/schemars_attrs.schema.json

@@ -4,7 +4,8 @@
   "type": "object",
   "required": [
     "myBool",
-    "myNumber"
+    "myNumber",
+    "myVecStr"
   ],
   "properties": {
     "myBool": {
@@ -26,6 +27,13 @@
       "format": "int32",
       "maximum": 10.0,
       "minimum": 1.0
+    },
+    "myVecStr": {
+      "type": "array",
+      "items": {
+        "type": "string",
+        "pattern": "^x$"
+      }
     }
   },
   "additionalProperties": false,

schemars/tests/expected/validate_inner.json

@@ -0,0 +1,74 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Struct",
+  "type": "object",
+  "required": [
+    "array_str_length",
+    "slice_str_contains",
+    "vec_i32_range",
+    "vec_str_length",
+    "vec_str_length2",
+    "vec_str_regex",
+    "vec_str_url"
+  ],
+  "properties": {
+    "array_str_length": {
+      "type": "array",
+      "items": {
+        "type": "string",
+        "maxLength": 100,
+        "minLength": 5
+      },
+      "maxItems": 2,
+      "minItems": 2
+    },
+    "slice_str_contains": {
+      "type": "array",
+      "items": {
+        "type": "string",
+        "pattern": "substring\\.\\.\\."
+      }
+    },
+    "vec_i32_range": {
+      "type": "array",
+      "items": {
+        "type": "integer",
+        "format": "int32",
+        "maximum": 10.0,
+        "minimum": -10.0
+      }
+    },
+    "vec_str_length": {
+      "type": "array",
+      "items": {
+        "type": "string",
+        "maxLength": 100,
+        "minLength": 1
+      }
+    },
+    "vec_str_length2": {
+      "type": "array",
+      "items": {
+        "type": "string",
+        "maxLength": 100,
+        "minLength": 1
+      },
+      "maxItems": 3,
+      "minItems": 1
+    },
+    "vec_str_regex": {
+      "type": "array",
+      "items": {
+        "type": "string",
+        "pattern": "^[Hh]ello\\b"
+      }
+    },
+    "vec_str_url": {
+      "type": "array",
+      "items": {
+        "type": "string",
+        "format": "uri"
+      }
+    }
+  }
+}

schemars/tests/expected/validate_schemars_attrs.json

@@ -1,6 +1,6 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
-  "title": "Struct",
+  "title": "Struct2",
   "type": "object",
   "required": [
     "contains_str1",

schemars/tests/validate.rs

@@ -101,7 +101,7 @@ pub struct Struct2 {
 
 #[test]
 fn validate_schemars_attrs() -> TestResult {
-    test_default_generated_schema::<Struct>("validate_schemars_attrs")
+    test_default_generated_schema::<Struct2>("validate_schemars_attrs")
 }
 
 #[derive(JsonSchema)]

schemars/tests/validate_inner.rs

@@ -0,0 +1,31 @@
+mod util;
+
+use schemars::JsonSchema;
+use util::*;
+
+// In real code, this would typically be a Regex, potentially created in a `lazy_static!`.
+static STARTS_WITH_HELLO: &str = r"^[Hh]ello\b";
+
+#[allow(dead_code)]
+#[derive(JsonSchema)]
+pub struct Struct<'a> {
+    #[schemars(inner(length(min = 5, max = 100)))]
+    array_str_length: [&'a str; 2],
+    #[schemars(inner(contains(pattern = "substring...")))]
+    slice_str_contains: &'a[&'a str],
+    #[schemars(inner(regex = "STARTS_WITH_HELLO"))]
+    vec_str_regex: Vec<String>,
+    #[schemars(inner(length(min = 1, max = 100)))]
+    vec_str_length: Vec<&'a str>,
+    #[schemars(length(min = 1, max = 3), inner(length(min = 1, max = 100)))]
+    vec_str_length2: Vec<String>,
+    #[schemars(inner(url))]
+    vec_str_url: Vec<String>,
+    #[schemars(inner(range(min = -10, max = 10)))]
+    vec_i32_range: Vec<i32>,
+}
+
+#[test]
+fn validate_inner() -> TestResult {
+    test_default_generated_schema::<Struct>("validate_inner")
+}