PHP: getting properties of an MgdSchema in correct order

1. Henri Bergius

   PHP: getting properties of an MgdSchema in correct order

   Wed November 11 2009 10:25:09 UTC
   Hi,
   
   I'm working on creating forms and object browsing views in MidCOM3
   based on MgdSchema reflection.
   
   One problem I have right now is that if I list the properties of an
   MgdSchema class using the following I get the in a random order:
   
   $dummy = new $type();
   $type_properties = get_object_vars($dummy);
   
   ...which is obviously confusing as the properties will be shown in
   very weird order.
   
   Asgard in Ragnaroek has some quite complex heuristics for this, but in
   reality when users design their MgdSchemas they usually place the
   properties in a sensible order that is better than the one we can
   create by heuristics.
   
   Is there, or can we have some way for listing the properties of an
   MgdSchema type in PHP in the order they appear in the original
   MgdSchema XML?
   
   --
   Henri Bergius
   Motorcycle Adventures and Free Software
   http://bergie.iki.fi/
   
   Skype: henribergius
   Jabber: henri.bergius@gmail.com
   Microblog: http://www.qaiku.com/home/bergie/
   
   My Royal Enfield Bullet 500 is for sale, see http://www.nettimoto.com/844397
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2. Andreas Flack

   Re: [midgard-dev] PHP: getting properties of an MgdSchema in correct order

   Wed November 11 2009 10:50:07 UTC
   I know this has been discussed before, but this question reminds me that
   I still haven't really understood why configuring form layout and
   behavior in the database schema is a good idea. On the plus side, I can
   see that this might offer reduced complexity and should probably be
   faster, but there are a lot of open questions, f.x.:
   
   - If I set some property to be hidden, required or readonly in the
   schema, does this apply only to the form view or also to PHP objects?
   
   - How do I implement a settings form (i.e. where form input is saved as
   parameters to f.x. a topic) or a preferences dialog (where form input is
   saved as parameters to a person)
   
   - What happens to null storage (i.e. some input field I want to have in
   the form, but process manually afterwards) and m:n relations (i.e.
   chooser widgets).
   
   - Will all fields defined in the schema be automatically be loaded when
   the object is instantiated (f.x. when loading a group object where a
   members chooser widget is defined in the schema, will all membership
   objects be loaded as well)?
   
   - Will it be necessary to restart Apache (and grant shell access to
   everone who wants to modify form layout) when you make changes?
   
   - How would you define callbacks to populate f.x. select lists?
   
   - What happens to constructs like 'readonly' => !$_MIDCOM->auth->admin ?
   
   - Will there be a way to define fieldsets?
   
   
   Bye,
   
   Andreas
   
   Henri Bergius schrieb:
   > Hi,
   >
   > I'm working on creating forms and object browsing views in MidCOM3
   > based on MgdSchema reflection.
   >
   > One problem I have right now is that if I list the properties of an
   > MgdSchema class using the following I get the in a random order:
   >
   > $dummy = new $type();
   > $type_properties = get_object_vars($dummy);
   >
   > ...which is obviously confusing as the properties will be shown in
   > very weird order.
   >
   > Asgard in Ragnaroek has some quite complex heuristics for this, but in
   > reality when users design their MgdSchemas they usually place the
   > properties in a sensible order that is better than the one we can
   > create by heuristics.
   >
   > Is there, or can we have some way for listing the properties of an
   > MgdSchema type in PHP in the order they appear in the original
   > MgdSchema XML?
   >
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3. Alexey Zakhlestine

   Re: [midgard-dev] PHP: getting properties of an MgdSchema in correct order

   Wed November 11 2009 11:15:08 UTC
   On 11.11.2009, at 13:17, Henri Bergius wrote:
   
   > Hi,
   >
   > I'm working on creating forms and object browsing views in MidCOM3
   > based on MgdSchema reflection.
   >
   > One problem I have right now is that if I list the properties of an
   > MgdSchema class using the following I get the in a random order:
   >
   > $dummy = new $type();
   > $type_properties = get_object_vars($dummy);
   >
   > ...which is obviously confusing as the properties will be shown in
   > very weird order.
   >
   > Asgard in Ragnaroek has some quite complex heuristics for this, but in
   > reality when users design their MgdSchemas they usually place the
   > properties in a sensible order that is better than the one we can
   > create by heuristics.
   >
   > Is there, or can we have some way for listing the properties of an
   > MgdSchema type in PHP in the order they appear in the original
   > MgdSchema XML?
   
   I don't think that it is a good idea to rely on order of fields in DB.
   Probably it would be a better idea to use midgard_reflection_property
   class for getting ordering info
   
   There isn't relevant method for that now, but it can be added
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4. Henri Bergius

   Re: [midgard-dev] PHP: getting properties of an MgdSchema in correct order

   Wed November 11 2009 11:40:06 UTC
   Hi,
   
   On Wed, Nov 11, 2009 at 1:11 PM, Alexey Zakhlestin <indeyets@gmail.com> wrote:
   > I don't think that it is a good idea to rely on order of fields in DB.
   > Probably it would be a better idea to use midgard_reflection_property
   > class for getting ordering info
   
   Yep, I'm not interested in the order of database columns, but instead
   in the order of <property /> elements in the MgdSchema XML files.
   
   > There isn't relevant method for that now, but it can be added
   
   Would make the stuff I'm hacking this week a lot easier :-)
   
   
   --
   Henri Bergius
   Motorcycle Adventures and Free Software
   http://bergie.iki.fi/
   
   Skype: henribergius
   Jabber: henri.bergius@gmail.com
   Microblog: http://www.qaiku.com/home/bergie/
   
   My Royal Enfield Bullet 500 is for sale, see http://www.nettimoto.com/844397
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5. Piotr Pokora

   Re: [midgard-dev] PHP: getting properties of an MgdSchema in correct order

   Wed November 11 2009 12:20:10 UTC
   Alexey Zakhlestin pisze:
   
   Hi!
   
   > I don't think that it is a good idea to rely on order of fields in DB.
   > Probably it would be a better idea to use midgard_reflection_property
   > class for getting ordering info
   >
   > There isn't relevant method for that now, but it can be added
   
   This is not trivial task.
   When reading/parsing schema we add properties to internal storage in the
   same order they are declared in schema file.
   
   First problem is GHashTable which returns our properties in different
   order. This order, is however kept the same when properties are
   registered for GObjectClass and returned from list_properties particular
   routine.
   
   The latter works "as is" right now, but may work different in a future.
   Proper implementation requires many computation to be made and simply we
   should invent our own class inheritance introspection for this.
   
   Piotras
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6. Piotr Pokora

   Re: [midgard-dev] PHP: getting properties of an MgdSchema in correct order

   Tue November 17 2009 11:55:06 UTC
   Henri Bergius pisze:
   > Hi,
   
   Hi!
   
   > One problem I have right now is that if I list the properties of an
   > MgdSchema class using the following I get the in a random order:
   >
   > $dummy = new $type();
   > $type_properties = get_object_vars($dummy);
   >
   > ...which is obviously confusing as the properties will be shown in
   > very weird order.
   
   Added workaround for this problem.
   Should be available in binary packages @OBS soon.
   
   Piotras
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