Class attribute datatype convertion without data loss

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Author	Message
Piotrek Karaś	Tuesday 25 July 2006 5:35:55 am Is it possible to convert custom class' attribute's datatype to another (similar) without loosing the data inserted (as object attributes) before this convertion and with all the existing attributes being converted? Example: I have a simple custom class with only one attribute "my_description" which is of XML block type. After creating say 10 objects, I discover, that I don't need XML block after all and Text block would be just enough and even more convenient (no tags were ever used). Is it possible to convert the "my_description" attribute to a Text block without loosing the values of the existing 10 objects, so that when I edit one of them, it's available through classic textarea instead of OnlineEditor and data is all there? Any help would be appreciated. PS. This is my first post, 2 weeks of intensive eZpublish experience so far, hello to everyone :) -- Company: mediaSELF Sp. z o.o., http://www.mediaself.pl eZ references: http://ez.no/partners/worldwide_partners/mediaself eZ certified developer: http://ez.no/certification/verify/272585 eZ blog: http://ez.ryba.eu
Mark Marsiglio	Tuesday 25 July 2006 6:18:39 am With only 10 objects, I think the easiest way to accomplish this would be to add the text block, copy and paste each object's XML Block into the text block, then remove the XML block. As an aside though, it might be a good idea to leave it as an XML block, even if you don't think you will need it now. The problem might be turned around in the future when it would be harder to convert it back. There is little downside to using an XML block vs. a Text block that I know of. http://www.thinkcreative.com Turning Ideas Into Strategic Solutions
Piotrek Karaś	Tuesday 25 July 2006 9:25:10 am After your suggestions (which I find both true and valuable by the way) as well as few experiments of my own, I'm starting to face the fact, than planning would be everything in custom class use and eZ isn't as flexible as I thought (even though it is still far more than I have ever expected before I started using it) :) -- Company: mediaSELF Sp. z o.o., http://www.mediaself.pl eZ references: http://ez.no/partners/worldwide_partners/mediaself eZ certified developer: http://ez.no/certification/verify/272585 eZ blog: http://ez.ryba.eu
Kristof Coomans	Tuesday 25 July 2006 10:33:13 am Hi guys This is not a standard feature of eZ publish, but some time ago I've made an extension with a GUI for datatype conversions. It uses a plugin system, so every possible datatype-to-datatype conversion can be supported. The quality of the conversion depends on the plugin. You can download a first alpha release at http://ez.no/community/contribs/datatypes/datatypes. independent eZ Publish developer and service provider \| http://blog.coomanskristof.be \| http://ezpedia.org
Piotrek Karaś	Tuesday 25 July 2006 12:14:37 pm I will definitely give it a try (despite the highly experimental notice ;). Thanks a lot. -- Company: mediaSELF Sp. z o.o., http://www.mediaself.pl eZ references: http://ez.no/partners/worldwide_partners/mediaself eZ certified developer: http://ez.no/certification/verify/272585 eZ blog: http://ez.ryba.eu

eZ debug

Timing:	Jan 31 2025 06:29:46
Script start
Timing:	Jan 31 2025 06:29:46
Module start 'layout'
Timing:	Jan 31 2025 06:29:46
Module start 'content'
Timing:	Jan 31 2025 06:29:47
Module end 'content'
Timing:	Jan 31 2025 06:29:47
Script end

Main resources:

Total runtime	0.9986 sec
Peak memory usage	4,096.0000 KB
Database Queries	65

Timing points:

Checkpoint	Start (sec)	Duration (sec)	Memory at start (KB)	Memory used (KB)
Script start	0.0000	0.0058	588.3750	151.2422
Module start 'layout'	0.0058	0.0031	739.6172	36.7109
Module start 'content'	0.0089	0.9886	776.3281	1,007.0938
Module end 'content'	0.9975	0.0011	1,783.4219	16.1094
Script end	0.9986		1,799.5313

Time accumulators:

Accumulator	Duration (sec)	Duration (%)	Count	Average (sec)
Ini load
Load cache	0.0030	0.2980	16	0.0002
Check MTime	0.0013	0.1287	16	0.0001
Mysql Total
Database connection	0.0009	0.0895	1	0.0009
Mysqli_queries	0.9358	93.7076	65	0.0144
Looping result	0.0007	0.0698	63	0.0000
Template Total	0.9635	96.5	2	0.4818
Template load	0.0019	0.1951	2	0.0010
Template processing	0.9616	96.2878	2	0.4808
Template load and register function	0.0014	0.1424	1	0.0014
states
state_id_array	0.0012	0.1164	1	0.0012
state_identifier_array	0.0019	0.1867	2	0.0009
Override
Cache load	0.0016	0.1594	24	0.0001
Sytem overhead
Fetch class attribute can translate value	0.0005	0.0536	3	0.0002
Fetch class attribute name	0.0030	0.3007	8	0.0004
XML
Image XML parsing	0.0015	0.1527	3	0.0005
class_abstraction
Instantiating content class attribute	0.0000	0.0022	10	0.0000
General
dbfile	0.0021	0.2068	28	0.0001
String conversion	0.0000	0.0008	4	0.0000
Note: percentages do not add up to 100% because some accumulators overlap

Templates used to render the page:

Usage	Requested template	Template	Template loaded
1	node/view/full.tpl	full/forum_topic.tpl	extension/sevenx/design/simple/override/templates/full/forum_topic.tpl
5	content/datatype/view/ezimage.tpl	<No override>	extension/sevenx/design/simple/templates/content/datatype/view/ezimage.tpl
5	content/datatype/view/ezxmltext.tpl	<No override>	extension/community_design/design/suncana/templates/content/datatype/view/ezxmltext.tpl
5	content/datatype/view/ezxmltags/paragraph.tpl	<No override>	extension/ezwebin/design/ezwebin/templates/content/datatype/view/ezxmltags/paragraph.tpl
1	print_pagelayout.tpl	<No override>	extension/community/design/community/templates/print_pagelayout.tpl
Number of times templates used: 17 Number of unique templates used: 5

Time used to render debug report: 0.0001 secs