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# Queries

## Graph or Tree

Queries can return results in 2 formats. A graph or a tree.

Graphs results are a collection of records  (nodes) and a collection of edges. This format is more useful for network visualization.

The tree format is more straightforward as it returns a collection of records. Each record has a **_children** and a **_parents** field and the tree can continue upwards or downwards according to the depth you have requested.

For example to request records with their children and their children's children:

```php
$query->childrenDepth(2);
```
Maybe you only want to get a specific type of relationship:

```php
$query->childrenDepth(2)->childrenFields(["categories"]);
```

## Filters

You can filter your query with the following format:

```php
$query->filter(["field_operator" => "value"]);

// example:

$query->filter(["date_lt" => "2020-09-15"]);
```

Or filters are also available:

```php
$query
    ->filter(["price_eqn" => 10])
    ->orFilter(["title_regex" => "search", "slug_regex" => "search"])
    ;
```
## Operator List

- regex
- eq
- ne
- eqnum
- neqnum
- filter
- eqtrue
- eqfalse
- netrue
- nefalse
- in: 
- innum
- nin
- ninnum
- lt
- lte
- gt
- gte
- null
- nnull
- exists
- nexists

## Example

Get 10 posts from the sports category as a tree


```php
$posts = $query
    ->filter([
        "schema" => "posts",
        "children.categories.data.slug" => "sports",
       ]
    )
    ->childrenDepth(1)
    ->limit(10)
    ->tree();

$posts->map(...)->toArray();

```