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<DIV dir=ltr align=left><FONT face="Trebuchet MS" color=#0000ff size=2><SPAN
class=015575502-20112007>Hey Robert,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face="Trebuchet MS" color=#0000ff size=2><SPAN
class=015575502-20112007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face="Trebuchet MS" color=#0000ff size=2><SPAN
class=015575502-20112007> Is not Magma directly related case.
I think that is from the package with addons for Seaside that Keith Hodges made.
I'm sure you can ask him on the Seaside list,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face="Trebuchet MS" color=#0000ff size=2><SPAN
class=015575502-20112007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face="Trebuchet MS" color=#0000ff size=2><SPAN
class=015575502-20112007> cheers,</SPAN></FONT></DIV>
<DIV> </DIV>
<DIV align=left><SPAN class=250542422-20122006>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt" align=left><?xml:namespace prefix
= st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:PersonName
ProductID="Sebastian Sastre " w:st="on"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Trebuchet MS'">Sebastian
Sastre<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office"
/><o:p></o:p></SPAN></st1:PersonName></P>
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color=#0000ff size=2></FONT><BR></P></DIV>
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<FONT face=Tahoma size=2><B>De:</B> magma-bounces@lists.squeakfoundation.org
[mailto:magma-bounces@lists.squeakfoundation.org] <B>En nombre de </B>Robert
Schwarz<BR><B>Enviado el:</B> Lunes, 19 de Noviembre de 2007
19:15<BR><B>Para:</B> magma@lists.squeakfoundation.org<BR><B>Asunto:</B>
Tutorial<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Error: Magma helper not selected in application configuration.</DIV>
<DIV>When I add the WAMagmaConfiguration I see the Magma configuration group
but I didn't found any drop down menu where I can select WAMagma. </DIV>
<DIV><BR class=webkit-block-placeholder></DIV>
<DIV>How can I configure my application for the Magma helper?</DIV>
<DIV><BR class=webkit-block-placeholder></DIV>
<DIV>Robert</DIV><BR>
<DIV>
<DIV>Am 28.10.2007 um 06:57 schrieb Keith Hodges:</DIV><BR
class=Apple-interchange-newline>
<BLOCKQUOTE type="cite">
<DIV text="#000000" bgcolor="#ffffff">There have been calls for a Magma
tutorial to go into the Seaside tutorial in the persistency chapter. This
chapter already includes Glorp and GOODS.<BR><BR>Just in case someone is
already, or thinking of doing this, I have already written such a mini
tutorial.<BR><BR>In order to make Magma even easier to use, I have begun
rewriting "Magma seaside" to take advantage of my new Seaside Session
Helpers interface, which I released yesterday.<BR><BR>The idea being that
you can now use Magma, without a specialized Seaside Session class. This
should make it easier for users to adopt Magma for their existing
applications.<BR><BR>I am a little unsure as to how you are supposed to
obtain an exact match of a unique item from the database. <BR>This is how I
would do it (althought I know MagmaCollections dont actually implement
#firstOrNil)<BR><BR>^ (self users where: [ :each | each email = anEmail ])
firstOrNil<BR><BR>Is there a better way to obtain a unique
value?<BR><BR>cheers<BR><BR>Keith<BR><BR>p.s. the wiki page that I refer to
on MagmaCollections is a bit out of date.<BR>----<BR><BR>so far...
<BR><BR><B>Saving all data in an object-oriented database:
Magma</B><BR><BR>Another option to make your data persistent is to use an
object-oriented database like Magma.<BR><BR><B>Installing the Magma
Database</B><BR><BR>Magma is written entirely in Squeak, so there is no need
to install a separate server application. Both Magma and Seaside can run in
the same image. To install (into a 3.10 based image) just execute the
following. (This may take a while)<BR><BR><TT>Installer universes install:
'Magma seasideHelper'.</TT><BR><B><BR>Configuring your application to use
Magma</B><BR><BR>In the configuration for the 'todo' application you will
need to add WAMagmaConfiguration to the configuration "ancestry". Select it
from the drop down menu and click "Add". As soon as you do this, a new group
of configuration options will appear. You will need to select the "WAMagma",
helper class from the drop down menu.<BR><BR>The WAMagma class provides the
basic interface between Magma Sessions and Seaside Sessions. Subclasses
provide specialised session management such as shared or pooled sessions.
<BR><BR><B>Using Magma</B><BR><BR>Magma is very easy to use with seaside. To
obtain and use a database session helper, simply send <TT>#magma</TT> to the
current session. For example the code "<TT>self session magma"</TT> will
work within all seaside components.<BR><BR>To use Magma in this application
in a similar manner to the way we have connected to databases in other
examples we need to create an interfacing class, to which we can add our
specialized querying methods.<BR><BR><TT>Dictionary subclass:
#StMagmaDatabase<BR> instanceVariableNames:
''<BR> classVariableNames: ''<BR>
poolDictionaries: ''<BR> category:
'STTutTodoApp'<BR><BR>StSession-#initialize<BR> super
initialize.<BR> self db: (self magma rootAs:
StMagmaDatabase)<BR></TT><BR>The tutorial application accesses the database
via the <TT>#db </TT>accessor. Here we define this using the <TT>#rootAs:
</TT>helper method, which does everything we need, both to initialize the
database, and to provide us the interface that we want to it.<BR><BR>To
initialize our users collection we define the initialization on our root
object, and we need a method to return the users from the database, to add a
new user, and to find a
user.<BR><BR><TT>StMagmaDatabase-#initialize<BR> | users
|<BR> users := OrderedCollection
new.<BR> self at: #users put:
users.<BR><BR>StMagmaDatabase-#users<BR>
^ self at: #users <BR><BR>StMagmaDatabase-#addUser:
newUser<BR> ^ self users add:
newUser<BR><BR>StMagmaDatabase-#findUserByEmail:
anEmail<BR> ^ self users <BR>
detect: [:each | each email = anEmail]
<BR> ifNone:[]<BR></TT><BR>Notice how
for basic usage we have not needed any database specific code! If our
userbase is going to grow to a significant size it makes sense to re
implement the above using some database features, so we introduce a
MagmaCollection which you can read about in detail here: <A
class=moz-txt-link-freetext
href="http://wiki.squeak.org/squeak/2639">http://wiki.squeak.org/squeak/2639</A><BR><BR><TT>initialize<BR>
| users |<BR> users := MagmaCollection
new.<BR> users addIndex: (MaSearchStringIndex attribute:
#userName) beAscii.<BR> users addIndex:
(MaSearchStringIndex attribute: #email) beAscii.<BR> self
at: #users put: users<BR><BR>StMagmaDatabase-#users<BR>
^ self at: #users <BR><BR>StMagmaDatabase-#addUser:
newUser<BR> ^ self users add:
newUser<BR><BR>StMagmaDatabase-#findUserByEmail:
anEmail<BR> ^ (self users where: [ :each | each email =
anEmail ]) firstOrNil</TT><BR><BR>... need to explain how committing
works...
etc<BR><BR><BR><BR><BR> <BR></DIV>_______________________________________________<BR>Magma
mailing list<BR><A
href="mailto:Magma@lists.squeakfoundation.org">Magma@lists.squeakfoundation.org</A><BR>http://lists.squeakfoundation.org/mailman/listinfo/magma<BR></BLOCKQUOTE></DIV><BR></BLOCKQUOTE></BODY></HTML>