[reportlab-users] Problem with a class derived from Table

[Robin Becker]

shawn a wrote:

> Hello,

> 

> I have a custom table class whose base is Table. When i pass in data

> rows and the table can render itself  on ONE page there is no issue.

> But when i pass in a larger data rows list that need to split onto

> other pages i get an exception.

> 

> For the purpose of this email I've stripped the custom table class down to this:

> 

> from reportlab.platypus import Table

> class MyTable(Table):

> 	def __init__(self,data,**kw):

> 		Table.__init__(self,data,**kw)

> 

> then in my code

> 

> t = MyTable(data,style=s[0])

> 

>........


s/tables.py",

> line 860, in _splitRows

>     splitByRow=splitByRow)

> TypeError: __init__() takes exactly 2 non-keyword arguments (4 given)

> 

> 

> To recap my custom table class throws the above exception if the list

> data is to large and the table needs to split across pages. It works

> fine if the table can be rendered onto one page

> OR i use the Table class exclusively:(like so)

> t = Table(data,style=s[0])

> 

> thanks,

> -Shawn

.......

I think the error tells it. The signature for myTable() is not the same as for 
the original Table() so when the split occurs and the splitByRow method does

	R0 = self.__class__( data[:n], self._colWidths, self._argH[:n],
				repeatRows=repeatRows, repeatCols=repeatCols,
				splitByRow=splitByRow)



we're passing three(+self) positional arguments. Two are actually keywords, but 
that doesn't matter. It would be more robust to pass these as positional and I 
will change the code in the trunk to do that, but without having keyword only 
arguments I don't see the right way to do this (ie it's the fact that some 
keywords can be passed as positional that causes this problem).
-- 
Robin Becker