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<div class="moz-cite-prefix">OK...That was much, much more than I
hoped for!!! :)<br>
<br>
I like most of your last ideas, especially the last one. The
others, though, were very helpful in giving insight as to how
EPrints works with respect to plugins and the get_value()
function. <br>
<br>
So for your last suggestion: What do you think this virtual field
should be, and how does somebody define a callback on a field's
return value? OK, If this, on the other hand, is not something
easy to implement, I can definitely go with your fore-last
suggestion, using this "eprint_fields_automatic.pl" (which I had
no idea of...it sounds very promising as well (as the syntax is
somehow self-explanatory or documented)).<br>
<br>
Thanks a lot Tim!!!<br>
<br>
On 25/06/2015 11:42 πμ, Timothy Miles-Board wrote:<br>
</div>
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<p>The "problem" is that when you ask $eprint->get_value()
for the value of a multilang field it gives you a perl data
structure - in this case arrayref (array of
{langcode=>text} hashrefs) - ie. the same behaviour as you
would expect for a compound field or any field with a multiple
value.</p>
<p><br>
</p>
<p>$eprint->get_value() is used everywhere - including in
export plugins. So any field where the plugin implicitly
expects a string - like title, abstract etc - it will output
something like ARRAYx01123123</p>
<p><br>
</p>
<p>So your options are:</p>
<p><br>
</p>
<p>* Fix up all the plugins to be cleverer about how they get
the "best" value of multilang field (ie. use get_value() then
look at the user's lang / default lang to pull out the best
string from the multilang structure) - but this would mean
repeating the same routine in every plugin..</p>
<p><br>
</p>
<p>* Change the way that get_value() works so that it somehow
decides which behaviour to use (arrayref vs best lang string)
based on calling context etc. - get_value is used everywhere
in EPrints so this would probably break everything..</p>
<p><br>
</p>
<p>* Add a layer of abstraction between the low level
get_value() and the plugins that defines an API for returning
language dependent strings - then change all the plugins to
use that (so instead of get_value(), plugins could call
get_lang_string() or something - something like this would be
the best approach...</p>
<p><br>
</p>
<p>In the meantime, what you could do is instead of changing the
default title, abstract etc fields, just define new multilang
versions.</p>
<p><br>
</p>
<p>So eg. ml_title, ml_abstract ...</p>
<p><br>
</p>
<p>Then use these in your workflow instead of the default title,
abstract .. etc.</p>
<p><br>
</p>
<p>Finally in eprint_fields_automatic.pl, write some code to
take the ml_* fields and populate the equivalent scalar
fields. So eg. get the value of ml_title, pull out the text in
the default language (or if the default language version is
not defined, some other language in order of preference - the
EPrints::Language module already does stuff like this with
phrases) and write that value into the title field.</p>
<p><br>
</p>
<p>Then anything that expects $eprint->get_value( "title" )
to return a string will be happy (albeit they will always give
the default/preferred language).</p>
<p><br>
</p>
<p>Or...</p>
<p><br>
</p>
<p>Change the default title, abstract etc. fields to a virtual
field so that you can dynamically work out the (string) value
by looking at ml_title, ml_abstract etc - as long as the value
returned is always a string this shouldn't break anything.</p>
<p><br>
</p>
<p>Food for thought I hope,</p>
<p><br>
</p>
<p>Tim</p>
<p><br>
</p>
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<br>
<div style="color: rgb(0, 0, 0);">
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
color="#000000" face="Calibri, sans-serif"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:eprints-tech-bounces@ecs.soton.ac.uk">eprints-tech-bounces@ecs.soton.ac.uk</a>
<a class="moz-txt-link-rfc2396E" href="mailto:eprints-tech-bounces@ecs.soton.ac.uk"><eprints-tech-bounces@ecs.soton.ac.uk></a> on behalf of
George Mamalakis <a class="moz-txt-link-rfc2396E" href="mailto:mamalos@eng.auth.gr"><mamalos@eng.auth.gr></a><br>
<b>Sent:</b> 25 June 2015 8:38 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:eprints-tech@ecs.soton.ac.uk">eprints-tech@ecs.soton.ac.uk</a><br>
<b>Subject:</b> [EP-tech] Re: [spam?] Re: How to set a
field to be multilang</font>
<div> </div>
</div>
<div>
<div class="moz-cite-prefix">Thanks Alen, I'll look into it
deeper.<br>
<br>
It's sad, though, that default Import/Export plugins
break. Could you give a few hints on how to customise
these plugins? (general guidelines). Could the changes be
applied on the parent Import and Export plugin, or most
child plugins tend to override functions dealing with
title, abstract, etc?<br>
<br>
And that being the case, isn't it equivalent to adding
extra fields for an additional language? Either way same
things are broken, right? :)<br>
<br>
Lastly, where are these metadata fields stored in the
database? Reading the article in the link you provided
diagonally, it seems that I need to update the database in
order to create them, right?<br>
<br>
Thanks again!<br>
<br>
On 24/06/2015 11:18 μμ, Alen Vodopijevec wrote:<br>
</div>
<blockquote type="cite">Hi!<br>
<br>
You have Metadata Field Types documented here:<br>
<a moz-do-not-send="true"
href="http://wiki.eprints.org/w/Category:EPrints_Metadata_Fields">http://wiki.eprints.org/w/Category:EPrints_Metadata_Fields</a><br>
<br>
But, be aware that changing title, keywords and abstract
fields to <br>
'compound' breaks default EPrints plugins - export/import
.. these <br>
plugins expect title/keywords/abstract to be simple and
not compound <br>
(hash) value.<br>
<br>
I'm using it that way but there is some extra effort to
customize and <br>
maintain import/export plugins.<br>
<br>
If anybody have a suggestion or a better solution please
let me know.<br>
<br>
Maybe this is a good opportunity to discuss that i18n
issues in EPrints.<br>
<br>
Kind regards,<br>
--<br>
Alen<br>
<br>
On 06/24/2015 10:15 AM, George Mamalakis wrote:<br>
> Ah,<br>
><br>
> And by the way, is there any documentation on this
"fields" attribute <br>
> somewhere? Cos I think it wasn't mentioned anywhere.<br>
><br>
> Thanks again!<br>
><br>
> On 24/06/2015 10:29 πμ, Timothy Miles-Board wrote:<br>
>><br>
>> ---------- Forwarded message ----------<br>
>> From: Timothy Miles-Board <a
moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:timothy.miles-board@ulcc.ac.uk">
<timothy.miles-board@ulcc.ac.uk></a><br>
>> Date: 18 Jun 2015 11:30 pm<br>
>> Subject: Re: [EP-tech] How to set a field to be
multilang<br>
>> To: <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:eprints-tech@ecs.soton.ac.uk">
eprints-tech@ecs.soton.ac.uk</a><br>
>> Cc:<br>
>><br>
>> {<br>
>> name => 'title',<br>
>> type => 'multilang',<br>
>> multiple => 1,<br>
>> fields => [ { sub_name => "text", type
=> "longtext",<br>
>> input_rows => 3, make_single_value_orderkey
=><br>
>> 'EPrints::Extras::english_title_orderkey' } ],<br>
>> input_add_boxes => 1,<br>
>> },<br>
>><br>
>><br>
>> Tim<br>
>><br>
>> On 23 Jun 2015 9:09 am, George Mamalakis <a
moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:mamalos@eng.auth.gr">
<mamalos@eng.auth.gr></a> wrote:<br>
>><br>
>> Guys (and girls),<br>
>><br>
>> Any news on multilingual fields? Anybody using
them?<br>
>><br>
>> Thanks!<br>
>><br>
>> George<br>
>><br>
>> On 18/06/2015 06:31 μμ, George Mamalakis wrote:<br>
>> > Hello again,<br>
>> ><br>
>> > I am trying to make my EPrints installation
support<br>
>> multilanguage fields<br>
>> > (eg. title, abstract, etc.). The thing I did
that worked (which<br>
>> doesn't<br>
>> > feel right to me, though) was adding a new
Metadata field (eg.<br>
>> title_en)<br>
>> > and add it to the database and workflow. On
the documentation,<br>
>> on the<br>
>> > other hand, I saw that there is a Multilang
field type<br>
>> > (./perl_lib/EPrints/MetaField/<a
moz-do-not-send="true" href="http://Multilang.pm">Multilang.pm</a>)
which should be<br>
>> used for<br>
>> > this purpose. The strange thing is that its
perldoc DESCRIPTION<br>
>> section<br>
>> > starts with "not done", probably meaning
that it's not implemented?<br>
>> > Disregarding the last comment, when I
changed<br>
>> > ./archives/myarchive/cfg/cfg.d/eprint_<a
moz-do-not-send="true" href="http://fields.pl">fields.pl</a>
title field to<br>
>> read:<br>
>> ><br>
>> > {<br>
>> > name => 'title',<br>
>> > type => 'multilang',<br>
>> > input_rows => 3,<br>
>> > make_single_value_orderkey =><br>
>> > 'EPrints::Extras::english_title_orderkey',<br>
>> > },<br>
>> ><br>
>> > and I reloaded epadmin, I got the following
error:<br>
>> ><br>
>> > "Error in field property for eprint.title:
fields on a multilang<br>
>> > metafield can't be undefined"<br>
>> ><br>
>> > So, which is the proper way for adding
multilanguage support in<br>
>> fields<br>
>> > and display them in workflows?<br>
>> ><br>
>> > Thanks for all help in advance!<br>
>> ><br>
>><br>
>><br>
>> -- <br>
>> George Mamalakis<br>
>><br>
>> IT and Security Officer,<br>
>> Electrical and Computer Engineer (Aristotle Univ.
of Thessaloniki),<br>
>> PhD (Aristotle Univ. of Thessaloniki),<br>
>> MSc (Imperial College of London)<br>
>><br>
>> School of Electrical and Computer Engineering<br>
>> Aristotle University of Thessaloniki<br>
>><br>
>> phone number : +30 (2310) 994379<br>
>><br>
>><br>
>><br>
>> *** Options:<br>
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><br>
><br>
> -- <br>
> George Mamalakis<br>
><br>
> IT and Security Officer,<br>
> Electrical and Computer Engineer (Aristotle Univ. of
Thessaloniki),<br>
> PhD (Aristotle Univ. of Thessaloniki),<br>
> MSc (Imperial College of London)<br>
><br>
> School of Electrical and Computer Engineering<br>
> Aristotle University of Thessaloniki<br>
><br>
> phone number : +30 (2310) 994379<br>
><br>
><br>
><br>
><br>
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<br>
<pre class="moz-signature" cols="72">--
George Mamalakis
IT and Security Officer,
Electrical and Computer Engineer (Aristotle Univ. of Thessaloniki),
PhD (Aristotle Univ. of Thessaloniki),
MSc (Imperial College of London)
School of Electrical and Computer Engineering
Aristotle University of Thessaloniki
phone number : +30 (2310) 994379
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<br>
<pre class="moz-signature" cols="72">--
George Mamalakis
IT and Security Officer,
Electrical and Computer Engineer (Aristotle Univ. of Thessaloniki),
PhD (Aristotle Univ. of Thessaloniki),
MSc (Imperial College of London)
School of Electrical and Computer Engineering
Aristotle University of Thessaloniki
phone number : +30 (2310) 994379
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