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Frontend
  • Introduction
  • Getting started
  • About
  • Retrieving data
    • Introduction
    • Making a request
    • Property paths
    • Data providers
    • HTTP data provider
    • GraphQL data provider
    • Queries
    • GraphQL queries
    • Query Manager
    • Custom query classes
    • Bulk queries
  • Changing data
    • Introduction
    • Transforming and mapping data
    • Accessing properties
    • Transforming data
    • Available transformers
    • Mapping data
  • Advanced usage
    • Validation
    • Caching
    • Data History
    • Events
    • Testing API requests
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On this page
  • Transforming single values
  • BooleanValue
  • DateTimeValue
  • FloatValue
  • IntegerValue
  • Transforming all values
  • HtmlEntitiesDecode
  • SetEmptyToNull
  • StripTags
  • Trim
  • Transforming data
  • MapValues
  • RenameFields

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  1. Changing data

Available transformers

Transforming single values

Single value transformers are used to transform an individual value as it is accessed from data. This is useful to ensure data values are of an expected type.

If the value cannot be found or cannot be transformed, then null is returned.

BooleanValue

Transform value to a boolean.

Usage:

$transformer = new BooleanValue('[question]');
$value = $transformer->getValue($data);

By default, the following values are transformed to yes: 1, '1', 'true', 'yes', 'y'

And the following values are transformed to no: 0, '0', 'false', 'no', 'n'

Values are checked case-insensitively.

You can customise this by passing your own yes and no values to the constructor:

$transformer = new BooleanValue('[question]', ['yes', 'true'], ['no', 'false']);

DateTimeValue

Transform value to a DateTime object.

Usage:

$transformer = new DateTimeValue('[date]');
$value = $transformer->getValue($data);

You can pass a datetime format to transform the string from by passing the format to the constructor:

$transformer = new DateTimeValue('[date]', 'YY-MM-DD');

FloatValue

Transform value to a float.

Usage:

$transformer = new FloatValue('[price]');
$value = $transformer->getValue($data);

IntegerValue

Transform value to an integer.

Usage:

$transformer = new IntegerValue('[id]');
$value = $transformer->getValue($data);

Transforming all values

A value transformer loops through all data applying the transformation to each value.

HtmlEntitiesDecode

Decode data that has been encoded with HTML entities.

SetEmptyToNull

StripTags

Strip HTML tags.

Trim

Trims whitespace from start and end of values.

Transforming data

A data transformer acts on data as a whole.

MapValues

Maps values for one specific data field from old to new values. For example, updating category values to match local values.

The MapValues class takes two arguments:

  • $mapping - array of new value => old value/s

Usage:

use Strata\Data\Transform\Data\MapValues;

// New value => old values
$mapping = [
    'casual'    => ['T-Shirts', 'Jeans'],
    'outdoor'   => ['Scarfs', 'Coats'],
];

$transform = new MapValues('[item][category]', $mapping);

$data = [
    'item' => [
        'category' => 'T-Shirts'
    ]
];
$data = $transform->transform($data);

// Returns: casual
echo $data = ['item']['category'];

Supports the NotTransformedInterface interface, getNotTransformed() returns an array of any old values that cannot be mapped to a new value.

if ($transform->hasNotTransformed()) {
    $oldValues = $transform->getNotTransformed();
}

RenameFields

The RenameFields class takes one argument:

Usage:

use Strata\Data\Transform\Data\RenameFields;

// New value => old value
$mapping = [
    '[name]'    => '[full_name]',
];

$transform = new MapValues('[item]', $mapping);

$data = [
    'full_name' => 'Simon Jones',
];
$data = $transform->transform($data);

// Returns an array with the key 'full_name' renamed to 'name'

Supports the NotTransformedInterface interface, getNotTransformed() returns an array of any new field names that cannot be renamed because the old fieldnames cannot be found.

if ($transform->hasNotTransformed()) {
    $oldValues = $transform->getNotTransformed();
}
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Last updated 2 years ago

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By default this transforms a datetime string using .

Normalize empty data by setting to null. Empty data is defined via the PHP .

$propertyPath - to root item to map values for

Renames data field names from old to new field names. This is very similar to , however instead of copying data values to a new array or object, renaming fields simply leaves the original data array as is and renames any specific fields.

$propertyPaths - array of new field names to old field names

supported date and time formats
empty() function
mapping
property path
property paths