Use newline-delimited JSON instead of CSV for test data files

Dockerfile

@@ -15,6 +15,7 @@ RUN cargo build --release --all-targets
 
 FROM debian:buster-slim as ndc-reference
 COPY --from=build /app/target/release/ndc-reference ./ndc-reference
-COPY --from=build /app/ndc-reference/articles.csv ./articles.csv
-COPY --from=build /app/ndc-reference/authors.csv ./authors.csv
+COPY --from=build /app/ndc-reference/articles.json ./articles.json
+COPY --from=build /app/ndc-reference/authors.json ./authors.json
+COPY --from=build /app/ndc-reference/universities.json ./universities.json
 CMD ["sh", "-c", "./ndc-reference"]

ndc-reference/Cargo.toml

@@ -11,7 +11,6 @@ path = "bin/reference/main.rs"
 ndc-client = { path = "../ndc-client" }
 
 axum = "^0.6.20"
-csv = "^1.3.0"
 indexmap = { version = "^2", features = ["serde"] }
 prometheus = "^0.13.3"
 regex = "^1.10.2"

ndc-reference/bin/reference/main.rs

@@ -36,22 +36,6 @@ pub struct AppState {
     pub metrics: Metrics,
 }
 // ANCHOR_END: app-state
-// ANCHOR: read_csv
-fn read_csv(path: &str) -> core::result::Result<BTreeMap<i64, Row>, Box<dyn Error>> {
-    let mut rdr = csv::Reader::from_path(path)?;
-    let mut records: BTreeMap<i64, Row> = BTreeMap::new();
-    for row in rdr.deserialize() {
-        let row: BTreeMap<String, serde_json::Value> = row?;
-        let id = row
-            .get("id")
-            .ok_or("'id' field not found in csv file")?
-            .as_i64()
-            .ok_or("'id' field was not an integer in csv file")?;
-        records.insert(id, row);
-    }
-    Ok(records)
-}
-// ANCHOR_END: read_csv
 
 // ANCHOR: read_json_lines
 fn read_json_lines(path: &str) -> core::result::Result<BTreeMap<i64, Row>, Box<dyn Error>> {
@@ -125,9 +109,9 @@ async fn metrics_middleware<T>(
 // ANCHOR_END: metrics_middleware
 // ANCHOR: init_app_state
 fn init_app_state() -> AppState {
-    // Read the CSV data files
-    let articles = read_csv("articles.csv").unwrap();
-    let authors = read_csv("authors.csv").unwrap();
+    // Read the JSON data files
+    let articles = read_json_lines("articles.json").unwrap();
+    let authors = read_json_lines("authors.json").unwrap();
     let universities = read_json_lines("universities.json").unwrap();
 
     let metrics = Metrics::new().unwrap();

specification/src/tutorial/getting-started.md

@@ -1,8 +1,8 @@
 # Getting Started
 
-The reference implementation will serve queries and mutations based on in-memory data read from CSV files.
+The reference implementation will serve queries and mutations based on in-memory data read from newline-delimited JSON files.
 
-First, we will define some types to represent the data in the CSV files. Rows of CSV data will be stored in memory as ordered maps:
+First, we will define some types to represent the data in the newline-delimited JSON files. Rows of JSON data will be stored in memory as ordered maps:
 
 ```rust,no_run,noplayground
 {{#include ../../../ndc-reference/bin/reference/main.rs:row-type}}
@@ -14,7 +14,7 @@ Our application state will consist of collections of various types of rows:
 {{#include ../../../ndc-reference/bin/reference/main.rs:app-state}}
 ```
 
-In our `main` function, the data connector reads the initial data from the CSV files, and creates the `AppState`:
+In our `main` function, the data connector reads the initial data from the newline-delimited JSON files, and creates the `AppState`:
 
 ```rust,no-run,noplayground
 {{#include ../../../ndc-reference/bin/reference/main.rs:init_app_state}}