Make Option<T> fields optional in generated schemas (#16)

schemars/tests/expected/doc_comments_enum.json

@@ -19,9 +19,6 @@
       "properties": {
         "Complex": {
           "type": "object",
-          "required": [
-            "my_nullable_string"
-          ],
           "properties": {
             "my_nullable_string": {
               "title": "A nullable string",

schemars/tests/expected/flatten.json

@@ -0,0 +1,34 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Flat",
+  "type": "object",
+  "required": [
+    "b",
+    "f",
+    "s",
+    "v"
+  ],
+  "properties": {
+    "b": {
+      "type": "boolean"
+    },
+    "f": {
+      "type": "number",
+      "format": "float"
+    },
+    "os": {
+      "default": "",
+      "type": "string"
+    },
+    "s": {
+      "type": "string"
+    },
+    "v": {
+      "type": "array",
+      "items": {
+        "type": "integer",
+        "format": "int32"
+      }
+    }
+  }
+}

schemars/tests/expected/struct-normal.json

@@ -10,6 +10,12 @@
     "bar": {
       "type": "boolean"
     },
+    "baz": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
     "foo": {
       "type": "integer",
       "format": "int32"

schemars/tests/expected/struct-tuple.json

@@ -9,8 +9,14 @@
     },
     {
       "type": "boolean"
+    },
+    {
+      "type": [
+        "string",
+        "null"
+      ]
     }
   ],
-  "maxItems": 2,
-  "minItems": 2
+  "maxItems": 3,
+  "minItems": 3
 }

schemars/tests/flatten.rs

@@ -1,6 +1,6 @@
 mod util;
-use pretty_assertions::assert_eq;
-use schemars::{schema_for, JsonSchema};
+use schemars::JsonSchema;
+use util::*;
 
 #[derive(Debug, JsonSchema)]
 struct Flat {
@@ -43,8 +43,11 @@ struct Deep4 {
 }
 
 #[test]
-fn flatten_schema() {
-    let flat = schema_for!(Flat);
-    let deep = schema_for!(Deep1);
-    assert_eq!(flat, deep);
+fn test_flat_schema() -> TestResult {
+    test_default_generated_schema::<Flat>("flatten")
+}
+
+#[test]
+fn test_flattened_schema() -> TestResult {
+    test_default_generated_schema::<Deep1>("flatten")
 }

schemars/tests/struct.rs

@@ -6,6 +6,7 @@ use util::*;
 pub struct Struct {
     foo: i32,
     bar: bool,
+    baz: Option<String>,
 }
 
 #[test]
@@ -14,7 +15,7 @@ fn struct_normal() -> TestResult {
 }
 
 #[derive(Debug, JsonSchema)]
-pub struct Tuple(i32, bool);
+pub struct Tuple(i32, bool, Option<String>);
 
 #[test]
 fn struct_tuple() -> TestResult {