hibernate - Grails controller saves the domain item anyways -

-

using grails 2.3.9

in controller checks , when failing returning custom error response. here code snippet:

def update() {     def instance = group.get(params.groupid)     instance.properies = params      if (instance.haserrors()) {         // going through here: instance not saved         respond instance.errors, view:'edit'         return     }      // custom checks     if(checksfailed) {         // instance saved anyways :(         instance.discard()         response.senderror(response.sc_conflict)         return     }      instance.save flush:true     // ... respond success }

when check fails, error response returned want it. however, instance gets saved anyways (the instance.save not reached). how can make grails/hibernate know not save instance?

another approach might disconnect instance hibernate session. how have in grails?

update: in controller domain instance scaffolded, instance.discard() trick works:

def update(group groupinstance) {     if (groupinstance.haserrors()) {         // going through here: instance not saved         respond instance.errors, view:'edit'         return     }      // custom checks     if(checksfailed) {         // instance not saved         groupinstance.discard()         response.senderror(response.sc_conflict)         return     }      groupinstance.save flush:true     // ... respond success }

i find difficult understand why works in 1 case , not in another.

the best way not use discard() instead use transactions , native transaction features of database. recommend moving logic service (separating controller flow code , logic of application. example:

class groupservice {    @transactional    void updatebook(params) {        ....        // custom checks        if(checksfailed) {           status.setrollbackonly() // rollback transaction                }        else {            instance.save flush:true        }    } }

you can either call setrollbackonly on transaction status or throw runtime exception.

note if use exceptions, can expensive best create custom exception type groupupdateexception , override fillinstacktrace not fill stack trace reduces cost of exception. see why throwable.fillinstacktrace() method public? why use it?


Comments

Post a Comment

Popular posts from this blog

C# random value from dictionary and tuple -

-
i have following code, , need random item contains string "region_1" dictionary. public static dictionary<int, tuple<string, int, currencytype>> itemarray = new dictionary<int, tuple<string, int, currencytype>>() { { 0xb3e, new tuple<string, int, currencytype>("region_1", 1500, currencytype.fame) } }; public static int generateitemid(string shopid) { var generateditem = itemarray.elementat(new random().next(0, itemarray.count)).key; } how select this? it's not possible efficiently... first create static random @ class level... prevent non-random behaviour if run query on short period of time... (it's seeded discrete clock) static random rnd = new random(); then: var item = itemarray.values .where(t => t.item1 == shopid) .orderby(_ => rnd.next()) .firstordefault()
Read more

cgi - How do I interpret URLs without extension as files rather than missing directories in nginx? -

-
so i'm trying install zoneminder , have run under nginx, has few compiled files need run using fast-cgi. these files lack extension. if file has extension, there no issue , nginx interprets file , return 404 if can't find it. if has no extension, assume it's directory , return 404 when can't find sort of index page. here have now: # security camera domain. server { listen 888; server_name mydomain.com; root /srv/http/zm; # enable php support. include php.conf; location / { index index.html index.htm index.php; } # enable cgi support. location ~ ^/cgi-bin/(.+)$ { alias /srv/cgi-bin/zm/; fastcgi_pass unix:/run/fcgiwrap.sock; fastcgi_param script_filename $document_root/$1; include fastcgi.conf; } } the idea is, under cgi-bin directory goes through fastcgi pipe. any idea on howi can fix this? upon closer inspection, realized zoneminder has 2 cgi sc...
Read more

.htaccess - htaccess convert request to clean url and add slash at the end of the url -

-
ok , searched more 4 days , more 20 posts here in stach or in websites without kind of success first here htaccess file rewriteengine on rewriterule ^([a-za-z0-9_]+)/?$ index.php?page=$1 [nc] rewriterule ^([a-za-z0-9_]+)\/([a-za-z0-9_]+)\/?$ index.php?page=$1&action=$2 [nc] i tried many codes 1 worked me can call request , works me www.example.com/pagename => www.example.com/index.php?page=pagename here questions , please provide me information "in detail" understand code well 1- how convert request automatically www.example.com/index.php?page=pagename www.example.com/pagename 2- if tried add slash @ end shows me page without images or styling mean www.example.com/pagename => works www.example.com/pagename/ => doesn't work that's :) for first part need 301 rule this: rewritecond %{the_request} /index\.php\?page=([^\s&]+) [nc] rewriterule ^ /%1? [r=301,l] for second part use absolute path in css, js, images files r...
Read more