I’ve read Fred Cheung’s excellent example of nested :includes at the
link;
His examples deal with including parent and children associations but
I can’t see the connection of how to address a child, grandchild
nested :include.
I am presenting my users’ with the ability to create a complex find
upon the Parent table.
The result of this find ( @parent ) will then be passed to another
find whose purpose is to create a multilevel ‘nested’ array that is
then passed to the .to_xml method.
I am pursuing this approach in order to pass the resultant @xmlout
array to the Jasper Reports ( iReport ) framework is which the user is
able to generate some very robust reports.
Obviously, one might suggest this approach;
for parent in @parents
@xmlout << parent
for child in parent.child
@xmlout << child
for grandchild in child.grandchildren
@xmlout << grandchild
When this @xmlout is created the indention of the resulting XML file
has the child and grandchild at equal levels in XML indentation as the
parent.
The only way I seem to be able to get a properly indented XML file
that makes sense to the Jasper Reports framework is to call
the .to_xml method against a ‘ActiveRecord’ prepared nested array. The
following attempts don’t ‘Blow Up’ but yield the child and NOT the
grandchild nested array. These are;
@xmlout << Parent.find(parent.id).to_xml(:include => {:children =>
{:child => :grandchildren}})
@xmlout << Parent.find(parent.id).to_xml(:include => {:children =>
{:grandchildren => :child}})
I am happy to share any parts of this endeavor which is loosely
predicated upon the excellent “How to Integrate Jasper Reports” at
http://wiki.rubyonrails.org/rails/pages/howtointegratejasperreports
Thank you,
David