Migrate equipment description field via hook_update_n().
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<?php
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/**
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* @file
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* Farm equipment install file.
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*/
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/**
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* Migrate Equipment Description field to plain Description field (from farm_fields).
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*/
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function farm_equipment_update_7000(&$sandbox) {
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// Revert this module's field_instance Features component.
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features_revert(array('farm_equipment' => array('field_instance')));
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// If the new description field database tables exist...
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if (db_table_exists('field_data_field_farm_description') && db_table_exists('field_revision_field_farm_description')) {
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// Copy all descriptions from the old database tables to the new ones.
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db_query('INSERT INTO {field_data_field_farm_description} SELECT * FROM {field_data_field_farm_equipment_description}');
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db_query('INSERT INTO {field_revision_field_farm_description} SELECT * FROM {field_revision_field_farm_equipment_description}');
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// Delete the old field.
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$field = field_info_instance('farm_asset', 'field_farm_equipment_description', 'equipment');
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field_delete_instance($field);
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}
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}
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