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[Form] Merging two (almost identical) paragraphs #17432

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Merged
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Nov 18, 2022
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[Form] Merging two (almost identical) paragraphs #17432

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12 changes: 5 additions & 7 deletions form/data_mappers.rst
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Expand Up @@ -19,13 +19,11 @@ The Difference between Data Transformers and Mappers
It is important to know the difference between
:doc:`data transformers </form/data_transformers>` and mappers.

* **Data transformers** change the representation of a value (e.g. from
``"2016-08-12"`` to a ``DateTime`` instance);
* **Data mappers** map data (e.g. an object or array) to form fields, and vice versa.

Changing a ``YYYY-mm-dd`` string value to a ``DateTime`` instance is done by a
data transformer. Populating inner fields (e.g year, hour, etc) of a compound date type using
a ``DateTime`` instance is done by the data mapper.
* **Data transformers** change the representation of a single value, e.g. from
``"2016-08-12"`` to a ``DateTime`` instance;
* **Data mappers** map data (e.g. an object or array) to one or many form fields, and vice versa,
e.g. using a single ``DateTime`` instance to populate the inner fields (e.g year, hour, etc.)
of a compound date type.

Creating a Data Mapper
----------------------
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