27 Apr
2012
27 Apr
'12
7:49 a.m.
Hello community,
I'm stuck on a problem to query average ratings data from pages - I
installed the Ratings plugin, of course.
The following query works as expected, and shows the pages having average
votes, ordered by ratings then date :
#set($xwql = "select doc.fullName, ratings.averagevote from Document doc,
doc.object(XWiki.AverageRatingsClass) as ratings order by
ratings.averagevote desc, doc.date desc")
Of course, it will return only those pages for wich
XWiki.AverageRatingsClass exists.
Of course, what I would like, is this query to return ALL documents ordered
by ratings, considering no rating equals to value 0.
There are two problems that make this impossible to achieve with XWQL (or
I'd better say that I didn't find how) :
- first, to get all documents I would have to perform a LEFT JOIN. I tried
many syntaxes but could not achieve that. Even in pure JPQL I would not be
able to perform the LEFT JOIN and specify an ON clause anyway ...
- second, I planned to use COALESCE(ratings.averagevote, 0), to consider
that no ratings equal to average 0, but this keyword is not recognized by
XWQL
I realize that this is more a JPQL/Database issue than XWiki issue, but
ordering pages by average ratings is a very common and evident use-case as
long as you activate ratings, so I believe there must be a solution to find
... And sorting things in memory is really not a very attractive solution :(
(adding a XWiki.AverageRatingsClass object to all pages would also do the
trick but it seems really expensive ...)
Thanks,
Jeremie
--
View this message in context:
http://xwiki.475771.n2.nabble.com/XWQL-and-ratings-tp7505249.html
Sent from the XWiki- Users mailing list archive at Nabble.com.
22 Jun
22 Jun
11:51 a.m.
Hi,
For the record, the only way I found to achieve my need was to execute
2 requests.
(the idea was to get list of pages ordered by ratings, then date).
First XWQL selects rated pages ordered by ratings then date:
#set($xwql = "select doc.fullName, ratings.averagevote from Document doc,
doc.object(XWiki.AverageRatingsClass) as ratings order by
ratings.averagevote desc, doc.date desc")
Second HQL (XWQL seems not to recognize EXISTS keyword) selects
remaining pages (without ratings) ordered by date:
#set($hql = "select doc.fullName, 0 from XWikiDocument doc where not
exists(select obj.name from BaseObject as obj where
obj.name=doc.fullName and obj.className='XWiki.AverageRatingsClass')
order by doc.date desc")
The concatenation of results of both requests provide the wanted result.
I could not find a solution using a unique request, though, making
difficult (impossible?) to integrate sort by ratings in a livetable,
for example.
BR,
Jeremie
2012/4/27 jerem <jeremie.bousquet(a)gmail.com>om>:
Hello community,
I'm stuck on a problem to query average ratings data from pages - I
installed the Ratings plugin, of course.
The following query works as expected, and shows the pages having average
votes, ordered by ratings then date :
#set($xwql = "select doc.fullName, ratings.averagevote from Document doc,
doc.object(XWiki.AverageRatingsClass) as ratings order by
ratings.averagevote desc, doc.date desc")
Of course, it will return only those pages for wich
XWiki.AverageRatingsClass exists.
Of course, what I would like, is this query to return ALL documents ordered
by ratings, considering no rating equals to value 0.
There are two problems that make this impossible to achieve with XWQL (or
I'd better say that I didn't find how) :
- first, to get all documents I would have to perform a LEFT JOIN. I tried
many syntaxes but could not achieve that. Even in pure JPQL I would not be
able to perform the LEFT JOIN and specify an ON clause anyway ...
- second, I planned to use COALESCE(ratings.averagevote, 0), to consider
that no ratings equal to average 0, but this keyword is not recognized by
XWQL
I realize that this is more a JPQL/Database issue than XWiki issue, but
ordering pages by average ratings is a very common and evident use-case as
long as you activate ratings, so I believe there must be a solution to find
... And sorting things in memory is really not a very attractive solution :(
(adding a XWiki.AverageRatingsClass object to all pages would also do the
trick but it seems really expensive ...)
Thanks,
Jeremie
--
View this message in context:
http://xwiki.475771.n2.nabble.com/XWQL-and-ratings-tp7505249.html
Sent from the XWiki- Users mailing list archive at Nabble.com.
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
23 Jun
23 Jun
8:01 a.m.
Hi Jeremie,
If you ultimately resorted to HQL, I guess you could of used HQL all the
way instead of XWQL and have only 1 query instead of XWQL+HQL, right?
Thanks,
Eduard
On Fri, Jun 22, 2012 at 2:51 PM, Jeremie BOUSQUET <
jeremie.bousquet(a)gmail.com> wrote:
Hi,
For the record, the only way I found to achieve my need was to execute
2 requests.
(the idea was to get list of pages ordered by ratings, then date).
First XWQL selects rated pages ordered by ratings then date:
#set($xwql = "select doc.fullName, ratings.averagevote from Document doc,
doc.object(XWiki.AverageRatingsClass) as ratings order by
ratings.averagevote desc, doc.date desc")
Second HQL (XWQL seems not to recognize EXISTS keyword) selects
remaining pages (without ratings) ordered by date:
#set($hql = "select doc.fullName, 0 from XWikiDocument doc where not
exists(select obj.name from BaseObject as obj where
obj.name=doc.fullName and obj.className='XWiki.AverageRatingsClass')
order by doc.date desc")
The concatenation of results of both requests provide the wanted result.
I could not find a solution using a unique request, though, making
difficult (impossible?) to integrate sort by ratings in a livetable,
for example.
BR,
Jeremie
2012/4/27 jerem <jeremie.bousquet(a)gmail.com>om>:
Hello community,
I'm stuck on a problem to query average ratings data from pages - I
installed the Ratings plugin, of course.
The following query works as expected, and shows the pages having average
votes, ordered by ratings then date :
#set($xwql = "select doc.fullName, ratings.averagevote from Document doc,
doc.object(XWiki.AverageRatingsClass) as ratings order by
ratings.averagevote desc, doc.date desc")
Of course, it will return only those pages for wich
XWiki.AverageRatingsClass exists.
Of course, what I would like, is this query to return ALL documents
ordered
by ratings, considering no rating equals to value
0.
There are two problems that make this impossible to achieve with XWQL (or
I'd better say that I didn't find how) :
- first, to get all documents I would have to perform a LEFT JOIN. I
tried
many syntaxes but could not achieve that. Even in
pure JPQL I would not
be
able to perform the LEFT JOIN and specify an ON
clause anyway ...
- second, I planned to use COALESCE(ratings.averagevote, 0), to consider
that no ratings equal to average 0, but this keyword is not recognized by
XWQL
I realize that this is more a JPQL/Database issue than XWiki issue, but
ordering pages by average ratings is a very common and evident use-case
as
long as you activate ratings, so I believe there
must be a solution to
find
... And sorting things in memory is really not a
very attractive
solution :(
(adding a XWiki.AverageRatingsClass object to all pages would also do the
trick but it seems really expensive ...)
Thanks,
Jeremie
--
View this message in context:
http://xwiki.475771.n2.nabble.com/XWQL-and-ratings-tp7505249.html
Sent from the XWiki- Users mailing list archive
at Nabble.com.
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
7:50 p.m.
Hi Eduard,
Well, that's what I expected but I did not succeed to find a solution
with a unique query, wether in XWQL or HQL.
The solution would be to do a left join, but I could not find how to
formulate it and I wonder if it's possible with the current mappings.
Jeremie
2012/6/23 Eduard Moraru <enygma2002(a)gmail.com>om>:
Hi Jeremie,
If you ultimately resorted to HQL, I guess you could of used HQL all the
way instead of XWQL and have only 1 query instead of XWQL+HQL, right?
Thanks,
Eduard
On Fri, Jun 22, 2012 at 2:51 PM, Jeremie BOUSQUET <
jeremie.bousquet(a)gmail.com> wrote:
Hi,
For the record, the only way I found to achieve my need was to execute
2 requests.
(the idea was to get list of pages ordered by ratings, then date).
First XWQL selects rated pages ordered by ratings then date:
#set($xwql = "select doc.fullName, ratings.averagevote from Document doc,
doc.object(XWiki.AverageRatingsClass) as ratings order by
ratings.averagevote desc, doc.date desc")
Second HQL (XWQL seems not to recognize EXISTS keyword) selects
remaining pages (without ratings) ordered by date:
#set($hql = "select doc.fullName, 0 from XWikiDocument doc where not
exists(select obj.name from BaseObject as obj where
obj.name=doc.fullName and obj.className='XWiki.AverageRatingsClass')
order by doc.date desc")
The concatenation of results of both requests provide the wanted result.
I could not find a solution using a unique request, though, making
difficult (impossible?) to integrate sort by ratings in a livetable,
for example.
BR,
Jeremie
2012/4/27 jerem <jeremie.bousquet(a)gmail.com>om>:
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users Hello community,
I'm stuck on a problem to query average ratings data from pages - I
installed the Ratings plugin, of course.
The following query works as expected, and shows the pages having average
votes, ordered by ratings then date :
#set($xwql = "select doc.fullName, ratings.averagevote from Document doc,
doc.object(XWiki.AverageRatingsClass) as ratings order by
ratings.averagevote desc, doc.date desc")
Of course, it will return only those pages for wich
XWiki.AverageRatingsClass exists.
Of course, what I would like, is this query to return ALL documents
ordered
by ratings, considering no rating equals to value
0.
There are two problems that make this impossible to achieve with XWQL (or
I'd better say that I didn't find how) :
- first, to get all documents I would have to perform a LEFT JOIN. I
tried
many syntaxes but could not achieve that. Even in
pure JPQL I would not
be
able to perform the LEFT JOIN and specify an ON
clause anyway ...
- second, I planned to use COALESCE(ratings.averagevote, 0), to consider
that no ratings equal to average 0, but this keyword is not recognized by
XWQL
I realize that this is more a JPQL/Database issue than XWiki issue, but
ordering pages by average ratings is a very common and evident use-case
as
long as you activate ratings, so I believe there
must be a solution to
find
... And sorting things in memory is really not a
very attractive
solution :(
(adding a XWiki.AverageRatingsClass object to all pages would also do the
trick but it seems really expensive ...)
Thanks,
Jeremie
--
View this message in context:
http://xwiki.475771.n2.nabble.com/XWQL-and-ratings-tp7505249.html
Sent from the XWiki- Users mailing list archive
at Nabble.com.
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
24 Jun
24 Jun
6:23 a.m.
I had the exact same objective a long time ago and could not find a solution. I think we
thought about creating the missing objects.
I don't think coalesce would have worked. The main issue is get the lines
Ludovic
Envoyé de mon iPad
Le 23 juin 2012 à 21:50, Jeremie BOUSQUET <jeremie.bousquet(a)gmail.com> a écrit :
Hi Eduard,
Well, that's what I expected but I did not succeed to find a solution
with a unique query, wether in XWQL or HQL.
The solution would be to do a left join, but I could not find how to
formulate it and I wonder if it's possible with the current mappings.
Jeremie
2012/6/23 Eduard Moraru <enygma2002(a)gmail.com>om>:
Hi Jeremie,
If you ultimately resorted to HQL, I guess you could of used HQL all the
way instead of XWQL and have only 1 query instead of XWQL+HQL, right?
Thanks,
Eduard
On Fri, Jun 22, 2012 at 2:51 PM, Jeremie BOUSQUET <
jeremie.bousquet(a)gmail.com> wrote:
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users Hi,
For the record, the only way I found to achieve my need was to execute
2 requests.
(the idea was to get list of pages ordered by ratings, then date).
First XWQL selects rated pages ordered by ratings then date:
#set($xwql = "select doc.fullName, ratings.averagevote from Document doc,
doc.object(XWiki.AverageRatingsClass) as ratings order by
ratings.averagevote desc, doc.date desc")
Second HQL (XWQL seems not to recognize EXISTS keyword) selects
remaining pages (without ratings) ordered by date:
#set($hql = "select doc.fullName, 0 from XWikiDocument doc where not
exists(select obj.name from BaseObject as obj where
obj.name=doc.fullName and obj.className='XWiki.AverageRatingsClass')
order by doc.date desc")
The concatenation of results of both requests provide the wanted result.
I could not find a solution using a unique request, though, making
difficult (impossible?) to integrate sort by ratings in a livetable,
for example.
BR,
Jeremie
2012/4/27 jerem <jeremie.bousquet(a)gmail.com>om>:
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users Hello community,
I'm stuck on a problem to query average ratings data from pages - I
installed the Ratings plugin, of course.
The following query works as expected, and shows the pages having average
votes, ordered by ratings then date :
#set($xwql = "select doc.fullName, ratings.averagevote from Document doc,
doc.object(XWiki.AverageRatingsClass) as ratings order by
ratings.averagevote desc, doc.date desc")
Of course, it will return only those pages for wich
XWiki.AverageRatingsClass exists.
Of course, what I would like, is this query to return ALL documents
ordered
by ratings, considering no rating equals to value
0.
There are two problems that make this impossible to achieve with XWQL (or
I'd better say that I didn't find how) :
- first, to get all documents I would have to perform a LEFT JOIN. I
tried
many syntaxes but could not achieve that. Even in
pure JPQL I would not
be
able to perform the LEFT JOIN and specify an ON
clause anyway ...
- second, I planned to use COALESCE(ratings.averagevote, 0), to consider
that no ratings equal to average 0, but this keyword is not recognized by
XWQL
I realize that this is more a JPQL/Database issue than XWiki issue, but
ordering pages by average ratings is a very common and evident use-case
as
long as you activate ratings, so I believe there
must be a solution to
find
... And sorting things in memory is really not a
very attractive
solution :(
(adding a XWiki.AverageRatingsClass object to all pages would also do the
trick but it seems really expensive ...)
Thanks,
Jeremie
--
View this message in context:
http://xwiki.475771.n2.nabble.com/XWQL-and-ratings-tp7505249.html
Sent from the XWiki- Users mailing list archive
at Nabble.com.
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
25 Jun
25 Jun
12:30 p.m.
As far as I can tell, you can only do joins in HQL *if* you have set up
object mappings (one-to-one, one-to-many, etc.). However, as far as I can
see in our Hibernate mapping, XWiki does not do these mappings and only
does basic property-to-primitiveType-to-table-column mappings.
This is also the cause for the very verbose HQL queries that we have to do:
"... BaseObject obj, StringProperty prop where and prop.id.id=obj.id and
prop.name='age'... etc." instead of "select
someObject.someProperty" but
this is also because XWiki objects don`t have individual backing java
classes and that xwiki 'classes' are created at runtime, using a single
generic backing java class (BaseObject).
Thanks,
Eduard
On Sun, Jun 24, 2012 at 9:23 AM, ludovic(a)xwiki.com <ludovic(a)xwiki.com>wrote;wrote:
I had the exact same objective a long time ago and
could not find a
solution. I think we thought about creating the missing objects.
I don't think coalesce would have worked. The main issue is get the lines
Ludovic
Envoyé de mon iPad
Le 23 juin 2012 à 21:50, Jeremie BOUSQUET <jeremie.bousquet(a)gmail.com> a
écrit :
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
Hi Eduard,
Well, that's what I expected but I did not succeed to find a solution
with a unique query, wether in XWQL or HQL.
The solution would be to do a left join, but I could not find how to
formulate it and I wonder if it's possible with the current mappings.
Jeremie
2012/6/23 Eduard Moraru <enygma2002(a)gmail.com>om>:
> Hi Jeremie,
>
> If you ultimately resorted to HQL, I guess you could of used HQL all the
> way instead of XWQL and have only 1 query instead of XWQL+HQL, right?
>
> Thanks,
> Eduard
>
> On Fri, Jun 22, 2012 at 2:51 PM, Jeremie BOUSQUET <
> jeremie.bousquet(a)gmail.com> wrote:
>
>> Hi,
>>
>> For the record, the only way I found to achieve my need was to execute
>> 2 requests.
>> (the idea was to get list of pages ordered by ratings, then date).
>>
>> First XWQL selects rated pages ordered by ratings then date:
>> #set($xwql = "select doc.fullName, ratings.averagevote from Document
doc,
>> doc.object(XWiki.AverageRatingsClass) as
ratings order by
>> ratings.averagevote desc, doc.date desc")
>>
>> Second HQL (XWQL seems not to recognize EXISTS keyword) selects
>> remaining pages (without ratings) ordered by date:
>> #set($hql = "select doc.fullName, 0 from XWikiDocument doc where not
>> exists(select obj.name from BaseObject as obj where
>> obj.name=doc.fullName and obj.className='XWiki.AverageRatingsClass')
>> order by doc.date desc")
>>
>> The concatenation of results of both requests provide the wanted
result.
>> I could not find a solution using a
unique request, though, making
>> difficult (impossible?) to integrate sort by ratings in a livetable,
>> for example.
>>
>> BR,
>> Jeremie
>>
>> 2012/4/27 jerem <jeremie.bousquet(a)gmail.com>om>:
>>> Hello community,
>>>
>>> I'm stuck on a problem to query average ratings data from pages - I
>>> installed the Ratings plugin, of course.
>>>
>>> The following query works as expected, and shows the pages having
average
>>> votes, ordered by ratings then date
:
>>>
>>> #set($xwql = "select doc.fullName, ratings.averagevote from Document
doc,
>>> doc.object(XWiki.AverageRatingsClass)
as ratings order by
>>> ratings.averagevote desc, doc.date desc")
>>>
>>> Of course, it will return only those pages for wich
>>> XWiki.AverageRatingsClass exists.
>>>
>>> Of course, what I would like, is this query to return ALL documents
>> ordered
>>> by ratings, considering no rating equals to value 0.
>>>
>>> There are two problems that make this impossible to achieve with XWQL
(or
>>> I'd better say that I didn't
find how) :
>>> - first, to get all documents I would have to perform a LEFT JOIN. I
>> tried
>>> many syntaxes but could not achieve that. Even in pure JPQL I would
not
>> be
>>> able to perform the LEFT JOIN and specify an ON clause anyway ...
>>> - second, I planned to use COALESCE(ratings.averagevote, 0), to
consider
>>> that no ratings equal to average 0,
but this keyword is not
recognized by
>>> XWQL
>>>
>>> I realize that this is more a JPQL/Database issue than XWiki issue,
but
>>> ordering pages by average ratings is
a very common and evident
use-case
>> as
>>> long as you activate ratings, so I believe there must be a solution to
>> find
>>> ... And sorting things in memory is really not a very attractive
>> solution :(
>>>
>>> (adding a XWiki.AverageRatingsClass object to all pages would also do
the
> trick but it seems really expensive ...)
>
> Thanks,
> Jeremie
>
> --
> View this message in context:
http://xwiki.475771.n2.nabble.com/XWQL-and-ratings-tp7505249.html
> Sent from the XWiki- Users mailing list archive at Nabble.com.
> _______________________________________________
> users mailing list
> users(a)xwiki.org
> http://lists.xwiki.org/mailman/listinfo/users
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
2:50 p.m.
Could be solved if the following issue was solved:
https://hibernate.onjira.com/browse/HHH-16
(Explicit joins on unrelated classes)
But this issue has been there for a very long time ...
And even with that it would consider that non-matching items (objects
without average votes) would return null value for average vote, so
I'm not sure sorting would treat these correctly.
Jeremie
2012/6/25 Eduard Moraru <enygma2002(a)gmail.com>om>:
As far as I can tell, you can only do joins in HQL
*if* you have set up
object mappings (one-to-one, one-to-many, etc.). However, as far as I can
see in our Hibernate mapping, XWiki does not do these mappings and only
does basic property-to-primitiveType-to-table-column mappings.
This is also the cause for the very verbose HQL queries that we have to do:
"... BaseObject obj, StringProperty prop where and prop.id.id=obj.id and
prop.name='age'... etc." instead of "select
someObject.someProperty" but
this is also because XWiki objects don`t have individual backing java
classes and that xwiki 'classes' are created at runtime, using a single
generic backing java class (BaseObject).
Thanks,
Eduard
On Sun, Jun 24, 2012 at 9:23 AM, ludovic(a)xwiki.com <ludovic(a)xwiki.com>wrote;wrote:
I had the exact same objective a long time ago
and could not find a
solution. I think we thought about creating the missing objects.
I don't think coalesce would have worked. The main issue is get the lines
Ludovic
Envoyé de mon iPad
Le 23 juin 2012 à 21:50, Jeremie BOUSQUET <jeremie.bousquet(a)gmail.com> a
écrit :
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users Hi Eduard,
Well, that's what I expected but I did not succeed to find a solution
with a unique query, wether in XWQL or HQL.
The solution would be to do a left join, but I could not find how to
formulate it and I wonder if it's possible with the current mappings.
Jeremie
2012/6/23 Eduard Moraru <enygma2002(a)gmail.com>om>:
> Hi Jeremie,
>
> If you ultimately resorted to HQL, I guess you could of used HQL all the
> way instead of XWQL and have only 1 query instead of XWQL+HQL, right?
>
> Thanks,
> Eduard
>
> On Fri, Jun 22, 2012 at 2:51 PM, Jeremie BOUSQUET <
> jeremie.bousquet(a)gmail.com> wrote:
>
>> Hi,
>>
>> For the record, the only way I found to achieve my need was to execute
>> 2 requests.
>> (the idea was to get list of pages ordered by ratings, then date).
>>
>> First XWQL selects rated pages ordered by ratings then date:
>> #set($xwql = "select doc.fullName, ratings.averagevote from Document
doc,
>> doc.object(XWiki.AverageRatingsClass) as
ratings order by
>> ratings.averagevote desc, doc.date desc")
>>
>> Second HQL (XWQL seems not to recognize EXISTS keyword) selects
>> remaining pages (without ratings) ordered by date:
>> #set($hql = "select doc.fullName, 0 from XWikiDocument doc where not
>> exists(select obj.name from BaseObject as obj where
>> obj.name=doc.fullName and obj.className='XWiki.AverageRatingsClass')
>> order by doc.date desc")
>>
>> The concatenation of results of both requests provide the wanted
result.
>> I could not find a solution using a
unique request, though, making
>> difficult (impossible?) to integrate sort by ratings in a livetable,
>> for example.
>>
>> BR,
>> Jeremie
>>
>> 2012/4/27 jerem <jeremie.bousquet(a)gmail.com>om>:
>>> Hello community,
>>>
>>> I'm stuck on a problem to query average ratings data from pages - I
>>> installed the Ratings plugin, of course.
>>>
>>> The following query works as expected, and shows the pages having
average
>>> votes, ordered by ratings then date
:
>>>
>>> #set($xwql = "select doc.fullName, ratings.averagevote from Document
doc,
>>> doc.object(XWiki.AverageRatingsClass)
as ratings order by
>>> ratings.averagevote desc, doc.date desc")
>>>
>>> Of course, it will return only those pages for wich
>>> XWiki.AverageRatingsClass exists.
>>>
>>> Of course, what I would like, is this query to return ALL documents
>> ordered
>>> by ratings, considering no rating equals to value 0.
>>>
>>> There are two problems that make this impossible to achieve with XWQL
(or
>>> I'd better say that I didn't
find how) :
>>> - first, to get all documents I would have to perform a LEFT JOIN. I
>> tried
>>> many syntaxes but could not achieve that. Even in pure JPQL I would
not
>> be
>>> able to perform the LEFT JOIN and specify an ON clause anyway ...
>>> - second, I planned to use COALESCE(ratings.averagevote, 0), to
consider
>>> that no ratings equal to average 0,
but this keyword is not
recognized by
>>> XWQL
>>>
>>> I realize that this is more a JPQL/Database issue than XWiki issue,
but
>>> ordering pages by average ratings is
a very common and evident
use-case
>> as
>>> long as you activate ratings, so I believe there must be a solution to
>> find
>>> ... And sorting things in memory is really not a very attractive
>> solution :(
>>>
>>> (adding a XWiki.AverageRatingsClass object to all pages would also do
the
>>
trick but it seems really expensive ...)
>>
>> Thanks,
>> Jeremie
>>
>> --
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ludovic＠xwiki.com