Creating a grid layout based on (pairs of) model attributes

Hi,

I’ve tried looking for an answer to this via Google, various forums etc
but have not found one yet - which seems surprising as I don’t think the
requirement is that unusual.

Is there an ‘off the shelf’ gem or rails plugin to create a grid or
matrix based upon attributes of a model?

I’ve written a mechanism to suit my immediate needs but I’m wondering if
there’s a general purpose one available; or whether it’s worth making my
implementation more generic and releasing it for others to use.

Basically, what I’m looking to do is take a list of objects which have
attributes ‘name’,‘A’ and ‘B’ and produce a table with A across the top,
B down the side and ‘name’ in cells where the object matches both A and
B.

eg my object contains “name”, “category” and “context”
the range of values for each of “category” and “context” is fixed.

What I’d like is (and this looks OK in fixed width fonts)

±----------±-----------±----------------±------------±--------------------+
| | Office | Home | Car | Boat |
±----------±-----------±----------------±------------±--------------------+
| CD Player | Acme1000 | MegaCD-III | Dashplayer | Portaplayer |
±----------±-----------±----------------±------------±--------------------+
| Television| | BigPix HD | | miniscreen |
±----------±-----------±----------------±------------±--------------------+
| GPS | | | Whereami-x10| Titanic-II |
| | | | GetmeHome++ | Vandervecken-XX|
±----------±-----------±----------------±------------±--------------------+

where, for example, I have an object Item
and Item.name=“Acme1000” Item.category=“CD Player”
Item.context=“Office”

For what it’s worth, my current implementation (which is a little more
involved than this as I’m bunching several contexts together) uses a
pair of hash tables to convert attributes to row and column numbers.
These are used to index a 2D array whose cells are themselves arrays of
names
ie
col=colhash(item.context)
row=rowhash(item.category)
matrix[row][col] << item.name

I can then use nested loops in the view to create a tabular output.

Is there a less messy way than this? One that can accommodate new
categories or contexts easily ?

Thanks

Apologies - it looke OK until I hit submit !

the table looks messy in proportional fonts – in a CSV equivalent

Category, Office, Home, Car, Boat

CD Player, Acme1000, MegaCD-III, Dashplayer, Portaplayer

Television, ,BigPix HD, , miniscreen

GPS , , , Whereami-x10, Titanic-II
GPS , , , GetmeHome++, Vandervecken-XX|

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