php - One-to-one association in form? -

in symfony 2.0, how create drop down list using one-to-one association in form? can guys put example please?

i try answer question way understand it. let's have faculty object bound single university object. in form used create or edit faculty, display combo box of university in database , user choose 1 among them. there 1 special symfony field type this: entity type. below code of buildform method use in facultytype object used create faculty form:

// application\acmebundle\form\type\facultytype public function buildform(formbuilder $builder, array $options) {     $builder->add('name');     $builder->add('university', 'entity', array(         // class of entity used combo box item         'class' => 'acmebundle:university',          // property of entity displaying entity text         'property' => 'name',          // query builder used populate combo box, accepts         // querybuilder object or \closure below          'query_builder' => function(entityrepository $repository) {             // return query builder selecting universities             return $repository->createquerybuilder('u');         }     )); } 

note: there other properties can set entity field type, invite take @ page more information on it.

rendered, show combo box universities have set in database. when user save form, university chose assigned faculty object bound form via setter. render drop-down list instead of combo box. if need select multiple entities, 'multiple' option of field type entity useful.

this being said, example showed not one-to-one relation rather many-to-one faculty object , one-to-many university object. one-to-one relation more relation university has unique address. in case, combo box wouldn't useful since university can have 1 adress sub-form more appropriate. if has many adresses, becomes one-to-many relation relation between university , faculties.

not sure if answer question correctly hope lead final solution.

regards, matt