0

やや複雑な設計で、システムから「ItemCollection」を削除しようとしています。このオブジェクトは Publisher (1 対多) に属し、MediaItem (1 対多) と Posting (1 対 1) を持ちます。投稿は、非所有の多対多で他の 2 つのオブジェクトによって参照されます。

(親で removeFrom() を呼び出して) ItemCollection を削除すると、カスケードがトリガーされますが、多対多のコレクションで外部キー例外が発生します。beforeDelete() で他のコレクションから Posting を削除しようとしましたが、ログ出力はこれが機能していることを示していますが、外部キー例外は引き続き発生します。

主な階層は次のとおりです。

  class Publisher { 
    String name
    static hasMany = [collections : ItemCollection, defaultTags : MetaTag, feeds : Feed]

    static mapping = {
        collections cascade: 'all-delete-orphan'
    } 
}

class ItemCollection  {

    static hasOne = [posting:Posting]
    static hasMany = [items:MediaItem, tags:MetaTag] 
    static mapping = {
        items sort:'collectionOrder', order: 'asc', lazy:false, cascade: "all-delete-orphan"
        posting cascade: "all-delete-orphan"
        tags lazy:false
    }
    static belongsTo = [publisher:Publisher]
}


class Posting {
    static belongsTo = [itemCollection: ItemCollection]

    << see beforeDelete method below >>
}

Posting は、これら 2 つのクラスによって参照されます。

class ItemFeed {
    List posts  
    static hasMany = [posts:Posting, segments:FeedSegment] 

    static mapping = {
        segments cascade: 'all-delete-orphan'
        posts lazy:'false'

    }
    static constraints = {
        posts nullable:true
        segments nullable:true
    }
}

class FeedSegment {
    Date postingTime
    String s3objname
    List posts

    static belongsTo = [feed:ItemFeed]
    static hasMany = [posts:Posting]

    static constraints = {
        posts nullable:true
    }
}

私のコントローラーで私は呼んでいます：

collectionIds.addAll(params?.collectionIds)
collectionIds.each { id->
    log.info("deleting ${id}")
    def itemCollectionInstance = ItemCollection.get(id)
    def publisher = itemCollectionInstance.publisher
    publisher.removeFromCollections(itemCollectionInstance)
    publisher.save(flush:true)
}

そして、次の onDelete を Posting に追加しました。

def beforeDelete() {
        Posting.withNewSession {
            log.info 'trying to delete posting from feeds'

            Posting thees = Posting.get(id)   /// using "this" seemed to not be reliable..?
            log.info 'Deleting: ' + thees

            def feedsWithPost = ItemFeed.createCriteria().list{
                posts {
                    eq('id', thees.id)
                }
            }

            def x = feedsWithPost
            x.each { feed ->
                log.info '#posts: ' + feed.posts.size()
                feed.removeFromPosts(thees)
                if(feed.validate()) {
                    feed.save()
                } else {
                    log.warn "Problem with validation " + feed.errors.allErrors.dump()
                }
                log.info '#posts: ' + feed.posts.size()  <---- THIS SEEMS TO WORK. I SEE SIZE GO DOWN

            }

            // repeated for FeedSegment...

        }
    }

ItemCollection を削除しようとすると、次のスタック トレースが表示されます。

2012-10-02 18:09:21,499 [http-bio-9090-exec-1] INFO  feeds.Posting  - Deleting: com.broadcastr.feeds.Posting : 2
2012-10-02 18:09:21,507 [http-bio-9090-exec-1] INFO  feeds.Posting  - found feeds: [<com.broadcastr.feeds.ItemFeed@7592b321 category=Arts & Entertainment city=New York City posts=[com.broadcastr.feeds.Posting : 1, com.broadcastr.feeds.Posting : 2] lastUpdated=2012-10-02 17:27:48.819 segments=[] jsonMetaData=null errors=null id=1 version=2>]
2012-10-02 18:09:21,507 [http-bio-9090-exec-1] INFO  feeds.Posting  - #posts: 2
2012-10-02 18:09:21,507 [http-bio-9090-exec-1] INFO  feeds.Posting  - #posts: 1
2012-10-02 18:09:21,508 [http-bio-9090-exec-1] INFO  feeds.Posting  - found feeds: [<com.broadcastr.feeds.ItemFeed@7592b321 category=Arts & Entertainment city=New York City posts=[com.broadcastr.feeds.Posting : 1] lastUpdated=2012-10-02 17:27:48.819 segments=[] jsonMetaData=null errors=grails.validation.ValidationErrors: 0 errors id=1 version=2>]
2012-10-02 18:09:21,510 [http-bio-9090-exec-1] WARN  util.JDBCExceptionReporter  - SQL Error: 23503, SQLState: 23503
| Error 2012-10-02 18:09:21,510 [http-bio-9090-exec-1] ERROR util.JDBCExceptionReporter  - Referential integrity constraint violation: "FKFD598F4D2EE471: PUBLIC.ITEM_FEED_POSTING FOREIGN KEY(POSTING_ID) REFERENCES PUBLIC.POSTING(ID)"; SQL statement:
delete from posting where id=? and version=? [23503-164]
| Error 2012-10-02 18:09:21,512 [http-bio-9090-exec-1] ERROR events.PatchedDefaultFlushEventListener  - Could not synchronize database state with session
Message: could not delete: [com.broadcastr.feeds.Posting#2]
   Line | Method
->>  41 | doCall   in DebugFilters$_closure1_closure2_closure5
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   195 | doFilter in grails.plugin.cache.web.filter.PageFragmentCachingFilter
|    63 | doFilter in grails.plugin.cache.web.filter.AbstractFilter
|   886 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   908 | run . .  in     ''
^   680 | run      in java.lang.Thread
Caused by JdbcSQLException: Referential integrity constraint violation: "FKFD598F4D2EE471: PUBLIC.ITEM_FEED_POSTING FOREIGN KEY(POSTING_ID) REFERENCES PUBLIC.POSTING(ID)"; SQL statement:
delete from posting where id=? and version=? [23503-164]
->> 329 | getJdbcSQLException in org.h2.message.DbException
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   169 | get      in     ''
|   146 | get . .  in     ''
|   398 | checkRow in org.h2.constraint.ConstraintReferential
|   415 | checkRowRefTable in     ''
|   291 | checkRow in     ''
|   862 | fireConstraints in org.h2.table.Table
|   879 | fireAfterRow in     ''
|    99 | update . in org.h2.command.dml.Delete
|    73 | update   in org.h2.command.CommandContainer
|   226 | executeUpdate in org.h2.command.Command
|   143 | executeUpdateInternal in org.h2.jdbc.JdbcPreparedStatement
|   129 | executeUpdate in     ''
|   105 | executeUpdate in org.apache.commons.dbcp.DelegatingPreparedStatement
|    41 | doCall . in DebugFilters$_closure1_closure2_closure5
|   195 | doFilter in grails.plugin.cache.web.filter.PageFragmentCachingFilter
|    63 | doFilter in grails.plugin.cache.web.filter.AbstractFilter
|   886 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   908 | run . .  in     ''
^   680 | run      in java.lang.Thread
| Error 2012-10-02 18:09:21,516 [http-bio-9090-exec-1] ERROR servlet.GrailsDispatcherServlet  - HandlerInterceptor.afterCompletion threw exception
Message: could not delete: [com.broadcastr.feeds.Posting#2]; SQL [delete from posting where id=? and version=?]; constraint ["FKFD598F4D2EE471: PUBLIC.ITEM_FEED_POSTING FOREIGN KEY(POSTING_ID) REFERENCES PUBLIC.POSTING(ID)"; SQL statement:
delete from posting where id=? and version=? [23503-164]]; nested exception is org.hibernate.exception.ConstraintViolationException: could not delete: [com.broadcastr.feeds.Posting#2]
   Line | Method
->>  41 | doCall   in DebugFilters$_closure1_closure2_closure5
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   195 | doFilter in grails.plugin.cache.web.filter.PageFragmentCachingFilter
|    63 | doFilter in grails.plugin.cache.web.filter.AbstractFilter
|   886 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   908 | run . .  in     ''
^   680 | run      in java.lang.Thread
Caused by ConstraintViolationException: could not delete: [com.broadcastr.feeds.Posting#2]
->>  41 | doCall   in DebugFilters$_closure1_closure2_closure5
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   195 | doFilter in grails.plugin.cache.web.filter.PageFragmentCachingFilter
|    63 | doFilter in grails.plugin.cache.web.filter.AbstractFilter
|   886 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   908 | run . .  in     ''
^   680 | run      in java.lang.Thread
Caused by JdbcSQLException: Referential integrity constraint violation: "FKFD598F4D2EE471: PUBLIC.ITEM_FEED_POSTING FOREIGN KEY(POSTING_ID) REFERENCES PUBLIC.POSTING(ID)"; SQL statement:
delete from posting where id=? and version=? [23503-164]
->> 329 | getJdbcSQLException in org.h2.message.DbException
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|   169 | get      in     ''
|   146 | get . .  in     ''
|   398 | checkRow in org.h2.constraint.ConstraintReferential
|   415 | checkRowRefTable in     ''
|   291 | checkRow in     ''
|   862 | fireConstraints in org.h2.table.Table
|   879 | fireAfterRow in     ''
|    99 | update . in org.h2.command.dml.Delete
|    73 | update   in org.h2.command.CommandContainer
|   226 | executeUpdate in org.h2.command.Command
|   143 | executeUpdateInternal in org.h2.jdbc.JdbcPreparedStatement
|   129 | executeUpdate in     ''
|   105 | executeUpdate in org.apache.commons.dbcp.DelegatingPreparedStatement
|    41 | doCall . in DebugFilters$_closure1_closure2_closure5
|   195 | doFilter in grails.plugin.cache.web.filter.PageFragmentCachingFilter
|    63 | doFilter in grails.plugin.cache.web.filter.AbstractFilter
|   886 | runTask  in java.util.concurrent.ThreadPoolExecutor$Worker
|   908 | run . .  in     ''
^   680 | run      in java.lang.Thread
4

2 に答える 2

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私が扱っていない別のテーブルが参照されていることがわかりました。上記の答えを明確にするために- withNewSession はここで使用する正しいイディオムであり、 beforeDelete メソッド内で保存（フラッシュ：真）したくありません。

于 2012-10-05T19:17:51.687 に答える
0

おそらく、2 つのセッションを使用するべきではありません。beforeDeletePosting オブジェクトが削除される前に、ハンドラーで作成されたセッションがフラッシュされるという保証が休止状態にあるとは思いません。2 つの個別のセッションが必要ない場合は、withSession代わりに を使用しますwithNewSession。

于 2012-10-03T17:20:01.513 に答える