php - doctrine manyToMany SQLSTATE[HY000]: General error: 1005 Can't create table (errno: 150) -

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i have issue 

/**  * @package entity  * @orm\entity  * @orm\table(name="r_country")  */  class rcountry { /**  * @orm\column(type="string", length=2)  * @orm\id  */ protected $id;  ...      /**  *  * @orm\manytomany(targetentity="rlanguage")  * @orm\jointable(name="prohibited_language_display",  *      joincolumns={@orm\joincolumn(name="country_id", referencedcolumnname="id", ondelete="cascade")},  *      inversejoincolumns={@orm\joincolumn(name="language_id", referencedcolumnname="id", ondelete="cascade")}  *      )  *  */ protected $prohibitedlanguagedisplay;  ...  }  /**  * @package entity  * @orm\entity  * @orm\table(name="r_language")  */ class rlanguage {     /**      * @orm\column(type="string", length=20)      * @orm\id      *      */     protected $id; ... }

i'm trying manytomany relation doctrine when update fires error

[doctrine\dbal\exception\driverexception]
exception occurred while executing 'alter table prohibited_language_display add constraint fk_77b02d13f92f3e70 foreign key (country_id) references r_country (id) on delete cascade':
sqlstate[hy000]: general error: 1005 can't create table 'database.#sql-498_8797' (errno: 150) 

                                                                                                         [doctrine\dbal\driver\pdoexception]

sqlstate[hy000]: general error: 1005 can't create table 'database.#sql-498_8797' (errno: 150) 

                                                                                                         [pdoexception]

sqlstate[hy000]: general error: 1005 can't create table 'database.#sql-498_8797' (errno: 150)

this th dump sql

create table prohibited_language_google (country_id varchar(2) not null, language_id varchar(20) not null, index idx_77b02d13f92f3e70 (country_id), index idx_77b02d1382f1baf4 (language_id), primary key(country_id, language_id)) default character set utf8 collate utf8_unicode_ci engine = innodb; alter table prohibited_language_display add constraint fk_77b02d13f92f3e70 foreign key (country_id) references r_country (id) on delete cascade; alter table prohibited_language_google add constraint fk_77b02d1382f1baf4 foreign key (language_id) references r_language (id) on delete cascade;

i've tryed de drop database , create new 1 doctrine , it's ok way, want update otherwise ill lose data in database.

is there 1 can me?

the problem doctrine generates script create table collation utf_unicode_ci, changed utf8_general_ci in order change had add doctrineconfiguration in app/config.yml 

doctrine.dbal.default_table_options.collate: "utf8_general_ci"

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