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Selected Fields Providers
The selected fields providers must implement interface
Selected fields provider returns an array of field names which must be present in the select statement of the datasource
query according to the given datagrid configuration and parameters. In other words, depending on the datagrid configuration
and parameters (request- and user-specific), it must return the fields needed to be displayed/processed for the datagrid to be rendered correctly.
Keep in mind that the word field here does not mean an entity field or extended field, but rather a field that must be present in the select statement of a query.
OroDatagridBundle provides two selected fields providers out-of-box:
These providers are collected in the
Oro\Bundle\DataGridBundle\Provider\SelectedFields\SelectedFieldsProvider) service, which calls all its inner providers and returns an array of unique field names.
How to Use
Selected fields providers enable fetching field names which must be present in the datasource query of the datagrid. This data can be used in datagrid extensions which modify the datagrid configuration, add new columns, sorters, etc. The purpose is to detect whether it is necessary to add a certain field or join the datasource query, as not every field added to the query is actually displayed to the end user. This can significantly help improve the performance of datagrids that work with tables with many records.
For example, the
oro_datagrid.provider.selected_fields service is used in the
oro_entity_extend.datagrid.extension.dynamic_fields datagrid extension to prevent adding joins for extended fields which are not going to be displayed to the end user.
Selected Fields Provider
Oro\Bundle\DataGridBundle\Provider\SelectedFields\SelectedFieldsProvider composite provider is declared as the
oro_datagrid.provider.selected_fields service that returns selected fields from all inner providers.
$selectedFieldsStateProvider = $this->container->get('oro_datagrid.provider.selected_fields'); $selectedFields = $selectedFieldsStateProvider->getSelectedFields($datagridConfiguration, $datagridParameters); var_export($selectedFields); // Will output //['sampleField1', 'sampleColumn2']
Fields Required by Columns
Oro\Bundle\DataGridBundle\Provider\SelectedFields\SelectedFieldsFromColumnsProvider provider is declared as
oro_datagrid.provider.selected_fields.columns service. It returns fields (used in renderable columns) that must be present in the select statement of the datasource query.
Oro\Bundle\DataGridBundle\Provider\State\ColumnsStateProvider to fetch the current state of columns, then collects
data_name configuration options from columns which are currently
Keep in mind that the resulting array of fields can differ depending on the moment when the provider is called because it fetches data from the datagrid configuration and state, which can be changed by extensions and listeners.
oro_datagrid.provider.selected_fields.columns service is not intended to be used directly. Use the
oro_datagrid.provider.selected_fields service instead to get a full list of selected fields. However, you can use it if you specifically need those fields that are used in renderable columns.
Fields Required by Sorters
Oro\Bundle\DataGridBundle\Provider\SelectedFields\SelectedFieldsFromSortersProvider provider is declared as
oro_datagrid.provider.selected_fields.sorters service. It returns an array of field names (required by applied sorters)
which must be present in the select statement of the datasource query.
Oro\Bundle\DataGridBundle\Provider\State\SortersStateProvider to fetch the current state of sorters, then collects
data_name configuration options from sorters that are currently applied.
Keep in mind that the resulting array of fields can differ depending on the moment when a provider is called because it fetches data from the datagrid configuration and state that can be changed by extensions and listeners.
oro_datagrid.provider.selected_fields.sorters service is not intended to be used directly. Use
service instead to get a full list of selected fields. However, you can use it if you specifically need those fields that are required by applied sorters.
How to Customize
You can create your own selected fields provider by implementing
Oro\Bundle\DataGridBundle\Provider\SelectedFields\SelectedFieldsProviderInterface. Define it as a service with the