# discoveryrule.update

### Description

`object discoveryrule.update(object/array lldRules)`

This method allows to update existing LLD rules.

### Parameters

`(object/array)` LLD rule properties to be updated.

The `itemid` property must be defined for each LLD rule, all other
properties are optional. Only the passed properties will be updated, all
others will remain unchanged.

Additionally to the [standard LLD rule properties](object#lld_rule), the
method accepts the following parameters.

|Parameter|Type|Description|
|---------|----|-----------|
|filter|object|LLD rule [filter](/manual/api/reference/discoveryrule/object#lld_rule_filter) object to replace the current filter.|
|preprocessing|array|LLD rule [preprocessing](/manual/api/reference/discoveryrule/object#lld_rule_preprocessing) options to replace the current preprocessing options.|
|lld\_macro\_paths|array|LLD rule [lld\_macro\_path](/manual/api/reference/discoveryrule/object#lld_macro_path) options.|

### Return values

`(object)` Returns an object containing the IDs of the updated LLD rules
under the `itemids` property.

### Examples

#### Adding a filter to an LLD rule

Add a filter so that the contents of the *{\#FSTYPE}* macro would match
the *\@File systems for discovery* regexp.

Request:

``` {.java}
{
    "jsonrpc": "2.0",
    "method": "discoveryrule.update",
    "params": {
        "itemid": "22450",
        "filter": {
            "evaltype": 1,
            "conditions": [
                {
                    "macro": "{#FSTYPE}",
                    "value": "@File systems for discovery"
                }
            ]
        }
    },
    "auth": "038e1d7b1735c6a5436ee9eae095879e",
    "id": 1
}
```

Response:

``` {.java}
{
    "jsonrpc": "2.0",
    "result": {
        "itemids": [
            "22450"
        ]
    },
    "id": 1
}
```

#### Adding LLD macro paths

Request:

``` {.java}
{
    "jsonrpc": "2.0",
    "method": "discoveryrule.update",
    "params": {
        "itemid": "22450",
        "lld_macro_paths": [
            {
                "lld_macro": "{#MACRO1}",
                "path": "$.json.path"
            }
        ]
    },
    "auth": "038e1d7b1735c6a5436ee9eae095879e",
    "id": 1
}
```

Response:

``` {.java}
{
    "jsonrpc": "2.0",
    "result": {
        "itemids": [
            "22450"
        ]
    },
    "id": 1
}
```

#### Disable trapping

Disable LLD trapping for discovery rule.

Request:

``` {.java}
{
    "jsonrpc": "2.0",
    "method": "discoveryrule.update",
    "params": {
        "itemid": "28336",
        "allow_traps": "0"
    },
    "id": 36,
    "auth": "d678e0b85688ce578ff061bd29a20d3b"
}
```

Response:

``` {.java}
{
    "jsonrpc": "2.0",
    "result": {
        "itemids": [
            "28336"
        ]
    },
    "id": 36
}
```

#### Updating LLD rule preprocessing options

Update an LLD rule with preprocessing rule “JSONPath”.

Request:

``` {.java}
{
    "jsonrpc": "2.0",
    "method": "discoveryrule.update",
    "params": {
        "itemid": "44211",
        "preprocessing": [
            {
                "type": "12",
                "params": "$.path.to.json",
                "error_handler": "2",
                "error_handler_params": "5"
            }
        ]
    },
    "auth": "700ca65537074ec963db7efabda78259",
    "id": 1
}
```

Response:

``` {.java}
{
    "jsonrpc": "2.0",
    "result": {
        "itemids": [
            "44211"
        ]
    },
    "id": 1
}
```

### Source

CDiscoveryRule::update() in
*frontends/php/include/classes/api/services/CDiscoveryRule.php*.