MeiliSearch/flatten-serde-json/README.md

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# Flatten serde Json
This crate flatten [`serde_json`](https://docs.rs/serde_json/latest/serde_json/) `Object` in a format
similar to [elastic search](https://www.elastic.co/guide/en/elasticsearch/reference/current/nested.html).
## Examples
### There is nothing to do
```json
{
"id": "287947",
"title": "Shazam!",
"release_date": 1553299200,
"genres": [
"Action",
"Comedy",
"Fantasy"
]
}
```
Flattens to:
```json
{
"id": "287947",
"title": "Shazam!",
"release_date": 1553299200,
"genres": [
"Action",
"Comedy",
"Fantasy"
]
}
```
------------
### Objects
```json
{
"a": {
"b": "c",
"d": "e",
"f": "g"
}
}
```
Flattens to:
```json
{
"a.b": "c",
"a.d": "e",
"a.f": "g"
}
```
------------
### Array of objects
```json
{
"a": [
{ "b": "c" },
{ "b": "d" },
{ "b": "e" },
]
}
```
Flattens to:
```json
{
"a.b": ["c", "d", "e"],
}
```
------------
### Array of objects with normal value in the array
```json
{
"a": [
42,
{ "b": "c" },
{ "b": "d" },
{ "b": "e" },
]
}
```
Flattens to:
```json
{
"a": 42,
"a.b": ["c", "d", "e"],
}
```
------------
### Array of objects of array of objects of ...
```json
{
"a": [
"b",
["c", "d"],
{ "e": ["f", "g"] },
[
{ "h": "i" },
{ "e": ["j", { "z": "y" }] },
],
["l"],
"m",
]
}
```
Flattens to:
```json
{
"a": ["b", "c", "d", "l", "m"],
"a.e": ["f", "g", "j"],
"a.h": "i",
"a.e.z": "y",
}
```
------------
### Collision between a generated field name and an already existing field
```json
{
"a": {
"b": "c",
},
"a.b": "d",
}
```
Flattens to:
```json
{
"a.b": ["c", "d"],
}
```