examples/define_types.rs:add derive feature

Author: RandyMcMillan

query/Cargo.toml

@@ -19,7 +19,7 @@ path = "src/lib.rs"
 clap = { version = "4", features = ["derive"] }
 futures = "0.3"
 log = "0.4.27"
-serde = "1.0"
+serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 tokio = { version = "1", features = ["full"] }
 tokio-tungstenite = { version = "0.13.0", features = ["tls"] }

query/examples/define_types.rs

@@ -0,0 +1,55 @@
+use serde::{Deserialize, Serialize};
+use serde_json::Result;
+
+// Define structs that mirror the JSON structure
+#[derive(Debug, Deserialize, Serialize)]
+struct Outer {
+    level1_key: Inner,
+    other_key: String,
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+struct Inner {
+    level2_key_a: String,
+    level2_key_b: i64,
+    another_nested: DeepInner,
+}
+
+#[derive(Debug, Deserialize, Serialize)]
+struct DeepInner {
+    deep_key: bool,
+}
+
+fn main() -> Result<()> {
+    let json_data = r#"
+        {
+            "level1_key": {
+                "level2_key_a": "value_a",
+                "level2_key_b": 123,
+                "another_nested": {
+                    "deep_key": true
+                }
+            },
+            "other_key": "some_other_value"
+        }
+    "#;
+
+    // Deserialize the JSON string directly into your Rust struct
+    let parsed_data: Outer = serde_json::from_str(json_data)?;
+
+    // Access the second-level key directly through struct fields
+    let level2_value_a = &parsed_data.level1_key.level2_key_a;
+    let level2_value_b = parsed_data.level1_key.level2_key_b;
+    let deep_value = parsed_data.level1_key.another_nested.deep_key;
+
+
+    println!("Value of level2_key_a: {}", level2_value_a);
+    println!("Value of level2_key_b: {}", level2_value_b);
+    println!("Value of deep_key: {}", deep_value);
+
+    // If a field is missing or has the wrong type, serde_json::from_str will return an Err
+    // let invalid_json = r#"{ "level1_key": { "level2_key_a": "oops" } }"#;
+    // let _ = serde_json::from_str::<Outer>(invalid_json); // This would return an Error
+
+    Ok(())
+}