# ApplyMapping class
<a name="aws-glue-api-crawler-pyspark-transforms-ApplyMapping"></a>

Applies a mapping in a `DynamicFrame`.

## Example
<a name="pyspark-ApplyMapping-examples"></a>

We recommend that you use the [`DynamicFrame.apply_mapping()`](aws-glue-api-crawler-pyspark-extensions-dynamic-frame.md#aws-glue-api-crawler-pyspark-extensions-dynamic-frame-apply_mapping) method to apply a mapping in a `DynamicFrame`. To view a code example, see [Example: Use apply\$1mapping to rename fields and change field types](aws-glue-api-crawler-pyspark-extensions-dynamic-frame.md#pyspark-apply_mapping-example).

## Methods
<a name="aws-glue-api-crawler-pyspark-transforms-ApplyMapping-_methods"></a>
+ [\$1\$1call\$1\$1](#aws-glue-api-crawler-pyspark-transforms-ApplyMapping-__call__)
+ [apply](#aws-glue-api-crawler-pyspark-transforms-ApplyMapping-apply)
+ [name](#aws-glue-api-crawler-pyspark-transforms-ApplyMapping-name)
+ [describeArgs](#aws-glue-api-crawler-pyspark-transforms-ApplyMapping-describeArgs)
+ [describeReturn](#aws-glue-api-crawler-pyspark-transforms-ApplyMapping-describeReturn)
+ [describeTransform](#aws-glue-api-crawler-pyspark-transforms-ApplyMapping-describeTransform)
+ [describeErrors](#aws-glue-api-crawler-pyspark-transforms-ApplyMapping-describeErrors)
+ [Describe](#aws-glue-api-crawler-pyspark-transforms-ApplyMapping-describe)

## \$1\$1call\$1\$1(frame, mappings, transformation\$1ctx = "", info = "", stageThreshold = 0, totalThreshold = 0)
<a name="aws-glue-api-crawler-pyspark-transforms-ApplyMapping-__call__"></a>

Applies a declarative mapping to a specified `DynamicFrame`.
+ `frame` – The `DynamicFrame` to apply the mapping to (required).
+ `mappings` – A list of mapping tuples (required). Each consists of: (source column, source type, target column, target type).

  If the source column has a dot "`.`" in the name, you must place back-ticks "````" around it. For example, to map `this.old.name` (string) to `thisNewName`, you would use the following tuple:

  ```
  ("`this.old.name`", "string", "thisNewName", "string")
  ```
+ `transformation_ctx` – A unique string that is used to identify state information (optional).
+ `info` – A string that is associated with errors in the transformation (optional).
+ `stageThreshold` – The maximum number of errors that can occur in the transformation before it errors out (optional). The default is zero.
+ `totalThreshold` – The maximum number of errors that can occur overall before processing errors out (optional). The default is zero.

Returns only the fields of the `DynamicFrame` that are specified in the "mapping" tuples.

## apply(cls, \$1args, \$1\$1kwargs)
<a name="aws-glue-api-crawler-pyspark-transforms-ApplyMapping-apply"></a>

Inherited from `GlueTransform` [apply](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-apply).

## name(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-ApplyMapping-name"></a>

Inherited from `GlueTransform` [name](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-name).

## describeArgs(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-ApplyMapping-describeArgs"></a>

Inherited from `GlueTransform` [describeArgs](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeArgs).

## describeReturn(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-ApplyMapping-describeReturn"></a>

Inherited from `GlueTransform` [describeReturn](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeReturn).

## describeTransform(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-ApplyMapping-describeTransform"></a>

Inherited from `GlueTransform` [describeTransform](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeTransform).

## describeErrors(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-ApplyMapping-describeErrors"></a>

Inherited from `GlueTransform` [describeErrors](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeErrors).

## describe(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-ApplyMapping-describe"></a>

Inherited from `GlueTransform` [describe](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describe).