的Grails GORM - 父母之前保存孩子

我有幾個類，有一個孩子父母的關係，但是，試圖挽救一切的Grails GORM首先保存了孩子，這最終引發了以下錯誤時：的Grails GORM - 父母之前保存孩子

ORA-02291: integrity constraint violated - parent key not found

這裏是我的課的基本代碼表示：

class Request 
{ 
    // Mapping definitions 
    static mapping = { 
    table(name: 'FORMS_REQUEST') 
    tablePerHierarchy(false) 
    id(length: 20, precision: 20, scale: 0, generator: 'sequence', params: [sequence: 'FORMS_REQUEST_SEQ'])  
    } 

    // Properties 
    Timestamp version 
    Form form 
    Date submittedTime 
}

abstract class Form 
{ 
    // Mapping definitions 
    static mapping = { 
    table(name: 'FORMS_FORM') 
    tablePerHierarchy(false) 
    id(length: 20, precision: 20, scale: 0, generator: 'sequence', params: [sequence: 'FORMS_FORM_SEQ']) 
    } 

    // Relationship definitions 
    static belongsTo = [request: Request] 

    // Properties 
    Timestamp version 
}

class AccessForm extends Form 
{ 
    // Mapping definitions 
    static mapping = { 
    table(name: 'FORMS_ACCESS_FORM') 
    id(length: 20, precision: 20, scale: 0, generator: 'sequence', params: [sequence: 'FORMS_ACCESS_FORM_SEQ']) 
    } 

    // Relationship definitions 
    static hasMany = [adGroups: AccessFormAD, printers: AccessFormPrinter] 

    // Properties 
    List adGroups 
    List printers 
}

class AccessFormAD 
{ 
    // Mapping definitions 
    static mapping = { 
    table(name: 'FORMS_ACCESS_FORM_AD') 
    id(length: 20, precision: 20, scale: 0, generator: 'sequence', params: [sequence: 'FORMS_ACCESS_FORM_AD_SEQ']) 
    } 

    // Relationship definitions 
    static belongsTo = [accessForm: AccessForm] 

    // Properties 
    Timestamp version 
}

class AccessFormPrinter 
{ 
    // Mapping definitions 
    static mapping = { 
    table(name: 'FORMS_ACCESS_FORM_PRINTER') 
    id(length: 20, precision: 20, scale: 0, generator: 'sequence', params: [sequence: 'FORMS_ACCESS_FORM_PRINTER_SEQ']) 
    } 

    // Relationship definitions 
    static belongsTo = [accessForm: AccessForm] 

    // Properties 
    Timestamp version 
}

用正確的數據創建的所有類等，並調用後，以下：

request.save(flush: true)

我得到上述錯誤。日誌顯示在Hibernate下面的SQL語句：

Hibernate: select FORMS_REQUEST_SEQ.nextval from dual 
Hibernate: select FORMS_FORM_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: select FORMS_ACCESS_FORM_AD_SEQ.nextval from dual 
Hibernate: insert into FORMS_ACCESS_FORM_AD (version, checked, DN, type, access_form_id, ad_groups_idx, id) values (?, ?, ?, ?, ?, ?, ?) 
Sep. 02 2014 @ 03:58:06 PM - class spi.SqlExceptionHelper - ORA-02291: integrity constraint (FK_954TU4QUPD4QE7H72XGVXSTKV) violated - parent key not found

它首先搶救孩子的對象之前的父母，這可以解釋的錯誤，但是，我不知道爲什麼（似乎愚蠢的格姆做這個），我也不知道如何改變GORM（Hibernate）的行爲來首先保存父項。

來源

2014-09-02 Harry Muscle

我猜這是因爲您的頂級請求正在使用'Form form'而不是'static hasOne = [form：Form]'。 – 2014-09-02 20:33:11

有趣的...修復它。沒想到這是必需的（因爲只有當您想要更改哪個表具有外鍵時，才需要這種關係）。 – 2014-09-02 20:42:33

問題是，您的Request域類正在使用簡單的屬性分配爲相關的Form。

因此，而不是Form form您需要使用static hasOne = [form:Form]來定義該關係。

原因是GORM通過使用諸如hasOne和hasMany之類的東西來確定關係，並且反過來可以找出需要插入的東西的順序。

來源

2014-09-02 20:44:51

的Grails GORM - 父母之前保存孩子

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