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Make the json flattener return the original values

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Clément Renault 2023-03-15 11:01:51 +01:00
parent ea016d97af
commit d5881519cb
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1 changed files with 48 additions and 16 deletions
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64
flatten-serde-json/src/lib.rs
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@ -3,45 +3,45 @@
use serde_json::{Map, Value}; use serde_json::{Map, Value};
pub fn flatten(json: &Map<String, Value>) -> Map<String, Value> { pub fn flatten(json: &Map<String, Value>) -> Map<String, Value> {
let mut obj = Map::new(); let mut obj = json.clone();
let mut all_keys = vec![]; let mut all_entries = vec![];
insert_object(&mut obj, None, json, &mut all_keys); insert_object(&mut obj, None, json, &mut all_entries);
for key in all_keys { for (key, old_val) in all_entries {
obj.entry(key).or_insert(Value::Array(vec![])); obj.entry(key).or_insert(old_val.clone());
} }
obj obj
} }
fn insert_object( fn insert_object<'a>(
base_json: &mut Map<String, Value>, base_json: &mut Map<String, Value>,
base_key: Option<&str>, base_key: Option<&str>,
object: &Map<String, Value>, object: &'a Map<String, Value>,
all_keys: &mut Vec<String>, all_entries: &mut Vec<(String, &'a Value)>,
) { ) {
for (key, value) in object { for (key, value) in object {
let new_key = base_key.map_or_else(|| key.clone(), |base_key| format!("{base_key}.{key}")); let new_key = base_key.map_or_else(|| key.clone(), |base_key| format!("{base_key}.{key}"));
all_keys.push(new_key.clone()); all_entries.push((new_key.clone(), value));
if let Some(array) = value.as_array() { if let Some(array) = value.as_array() {
insert_array(base_json, &new_key, array, all_keys); insert_array(base_json, &new_key, array, all_entries);
} else if let Some(object) = value.as_object() { } else if let Some(object) = value.as_object() {
insert_object(base_json, Some(&new_key), object, all_keys); insert_object(base_json, Some(&new_key), object, all_entries);
} else { } else {
insert_value(base_json, &new_key, value.clone()); insert_value(base_json, &new_key, value.clone());
} }
} }
} }
fn insert_array( fn insert_array<'a>(
base_json: &mut Map<String, Value>, base_json: &mut Map<String, Value>,
base_key: &str, base_key: &str,
array: &Vec<Value>, array: &'a Vec<Value>,
all_keys: &mut Vec<String>, all_entries: &mut Vec<(String, &'a Value)>,
) { ) {
for value in array { for value in array {
if let Some(object) = value.as_object() { if let Some(object) = value.as_object() {
insert_object(base_json, Some(base_key), object, all_keys); insert_object(base_json, Some(base_key), object, all_entries);
} else if let Some(sub_array) = value.as_array() { } else if let Some(sub_array) = value.as_array() {
insert_array(base_json, base_key, sub_array, all_keys); insert_array(base_json, base_key, sub_array, all_entries);
} else { } else {
insert_value(base_json, base_key, value.clone()); insert_value(base_json, base_key, value.clone());
} }
@ -302,4 +302,36 @@ mod tests {
.unwrap() .unwrap()
); );
} }
#[test]
fn flatten_nested_values_keep_original_values() {
let mut base: Value = json!({
"tags": {
"t1": "v1"
},
"prices": {
"p1": [null]
}
});
let json = std::mem::take(base.as_object_mut().unwrap());
let flat = flatten(&json);
println!("{}", serde_json::to_string_pretty(&flat).unwrap());
assert_eq!(
&flat,
json!({
"tags": {
"t1": "v1"
},
"tags.t1": "v1",
"prices": {
"p1": [null]
},
"prices.p1": [null]
})
.as_object()
.unwrap()
);
}
} }