Re: [Rails] Reference pointer or Boolean attribute

On 22 August 2012 19:37, Jason Walsh <lists@ruby-forum.com> wrote:
> Hi
>
> Just interested in anybody's opinion on the following:
>
> I have one model class called Diagram, that contains a number of Node
> classes (ie 1-many relationship). One of the Node classes must be the
> start node.

Some questions:

Are the other nodes in a sequence or is it just the start node that is
special (in other words could you link from node to node)? I am not
saying you should do that, just asking the question.

Is the start node considered by the Diagram to be different from the
others, or is just that it happens to be the start one (whatever that
may mean)?

Is the node intrinsically a start node, in other words is there
something special about it, or is it only from the point of view of
the Diagram that it is node of this type. Or to put it another way
are there nodes of two types, 'start' and 'ordinary'?

Colin

>
> Which would be better:
>
> 1. Attribute in Diagram class called StartNode containing id of the
> start Node.
>
> 2. Boolean attribute in Node class called StartNode? and set to true if
> its the start node.
>
> Would be interested in knowing the 'Rails' way of doing this :)
>
> Cheers
>
> Jason
>
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