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AbstractRelationalFieldQueryDataModuleProcessor.php
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AbstractRelationalFieldQueryDataModuleProcessor.php
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<?php
declare(strict_types=1);
namespace PoP\API\ModuleProcessors;
use PoP\FieldQuery\QueryHelpers;
use PoP\ComponentModel\State\ApplicationState;
use PoP\ComponentModel\Facades\Schema\FieldQueryInterpreterFacade;
use PoP\ComponentModel\ModuleProcessors\AbstractQueryDataModuleProcessor;
abstract class AbstractRelationalFieldQueryDataModuleProcessor extends AbstractQueryDataModuleProcessor
{
protected function getFields(array $module, $moduleAtts): array
{
// If it is a virtual module, the fields are coded inside the virtual module atts
if (!is_null($moduleAtts)) {
return $moduleAtts['fields'];
}
// If it is a normal module, it is the first added, then simply get the fields from $vars
$vars = ApplicationState::getVars();
return $vars['query'] ?? [];
}
/**
* Property fields: Those fields which have a numeric key only
*
* @param array $module
* @return array
*/
protected function getPropertyFields(array $module): array
{
$moduleAtts = count($module) >= 3 ? $module[2] : null;
$fields = $this->getFields($module, $moduleAtts);
return array_values(array_filter(
$fields,
function ($key) {
return is_numeric($key);
},
ARRAY_FILTER_USE_KEY
));
}
/**
* Nested fields: Those fields which have a field as key and an array of submodules as value
*
* @param array $module
* @return array
*/
protected function getFieldsWithNestedSubfields(array $module): array
{
$moduleAtts = count($module) >= 3 ? $module[2] : null;
$fields = $this->getFields($module, $moduleAtts);
return array_filter(
$fields,
function ($key) {
return !is_numeric($key);
},
ARRAY_FILTER_USE_KEY
);
}
/**
* Given a field, return its corresponding "not(isEmpty($field))
*
* @param array $fields
* @return array
*/
protected function getNotIsEmptyConditionField(string $field): string
{
$fieldQueryInterpreter = FieldQueryInterpreterFacade::getInstance();
// Convert the field into its "not is null" version
if ($fieldAlias = $fieldQueryInterpreter->getFieldAlias($field)) {
$conditionFieldAlias = 'not-isnull-' . $fieldAlias;
}
return $fieldQueryInterpreter->getField(
'not',
[
'value' => $fieldQueryInterpreter->getField(
'isNull',
[
'value' => $fieldQueryInterpreter->composeField(
$fieldQueryInterpreter->getFieldName($field),
$fieldQueryInterpreter->getFieldArgs($field) ?? QueryHelpers::getEmptyFieldArgs()
),
]
),
],
$conditionFieldAlias,
false,
$fieldQueryInterpreter->getDirectives($field)
);
}
public function getDataFields(array $module, array &$props): array
{
// The fields which have a numeric key only are the data-fields for the current module level
// Process only the fields without "skip output if null". Those will be processed on function `getConditionalOnDataFieldSubmodules`
$fieldQueryInterpreter = FieldQueryInterpreterFacade::getInstance();
return array_filter(
$this->getPropertyFields($module),
function ($field) use ($fieldQueryInterpreter) {
return !$fieldQueryInterpreter->isSkipOuputIfNullField($field);
}
);
}
public function getDomainSwitchingSubmodules(array $module): array
{
$ret = parent::getDomainSwitchingSubmodules($module);
$fieldQueryInterpreter = FieldQueryInterpreterFacade::getInstance();
// The fields which are not numeric are the keys from which to switch database domain
$fieldNestedFields = $this->getFieldsWithNestedSubfields($module);
// Process only the fields without "skip output if null". Those will be processed on function `getConditionalOnDataFieldDomainSwitchingSubmodules`
$fieldNestedFields = array_filter(
$this->getFieldsWithNestedSubfields($module),
function ($field) use ($fieldQueryInterpreter) {
return !$fieldQueryInterpreter->isSkipOuputIfNullField($field);
},
ARRAY_FILTER_USE_KEY
);
// Create a "virtual" module with the fields corresponding to the next level module
foreach ($fieldNestedFields as $field => $nestedFields) {
$ret[$field] = array(
[
$module[0],
$module[1],
['fields' => $nestedFields]
],
);
}
return $ret;
}
public function getConditionalOnDataFieldSubmodules(array $module): array
{
$ret = parent::getConditionalOnDataFieldSubmodules($module);
$fieldQueryInterpreter = FieldQueryInterpreterFacade::getInstance();
// Calculate the property fields with "skip output if null" on true
$propertyFields = array_filter(
$this->getPropertyFields($module),
function ($field) use ($fieldQueryInterpreter) {
return $fieldQueryInterpreter->isSkipOuputIfNullField($field);
}
);
$relationalFields = array_keys(array_filter(
$this->getFieldsWithNestedSubfields($module),
function ($field) use ($fieldQueryInterpreter) {
return $fieldQueryInterpreter->isSkipOuputIfNullField($field);
},
ARRAY_FILTER_USE_KEY
));
$fields = array_values(array_unique(array_merge(
$propertyFields,
$relationalFields
)));
// Create a "virtual" module with the fields corresponding to the next level module
foreach ($fields as $field) {
$conditionField = $this->getNotIsEmptyConditionField($field);
$conditionalField = $fieldQueryInterpreter->removeSkipOuputIfNullFromField($field);
$ret[$conditionField][] = [
$module[0],
$module[1],
['fields' => [$conditionalField]]
];
}
return $ret;
}
public function getConditionalOnDataFieldDomainSwitchingSubmodules(array $module): array
{
$ret = parent::getConditionalOnDataFieldDomainSwitchingSubmodules($module);
$fieldQueryInterpreter = FieldQueryInterpreterFacade::getInstance();
// Calculate the nested fields with "skip output if null" on true
$fieldNestedFields = array_filter(
$this->getFieldsWithNestedSubfields($module),
function ($field) use ($fieldQueryInterpreter) {
return $fieldQueryInterpreter->isSkipOuputIfNullField($field);
},
ARRAY_FILTER_USE_KEY
);
foreach ($fieldNestedFields as $field => $nestedFields) {
$conditionField = $this->getNotIsEmptyConditionField($field);
$conditionalField = $fieldQueryInterpreter->removeSkipOuputIfNullFromField($field);
$ret[$conditionField][$conditionalField] = array(
[
$module[0],
$module[1],
['fields' => $nestedFields]
],
);
}
return $ret;
}
}