A rails model question

Rails
1

Hi all,

I am a newbie in ruby/rails.

I have a question about my database model:
table1: entities (name, description, author_id …)
table2: relations (source_id, target_id, relation_type) (it describes
the relations between 2 entities and the relation type)

How can I define models using rails, or do I need to redefine my
database schema?

thank you

2

On Jul 20, 2006, at 2:21 PM, Andy Gao wrote:

database schema?

thank you

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I’m slightly confused about what you’re trying to do. Regardless, it
sounds like you’re looking for has_many, belongs_to, etc. Those are
the active record commands that allow you to make relationships
between tables. If that sounds like what you want, then go check
them out in Agile Rails book.

-Ben L.

3

Ben L. wrote:

I’m slightly confused about what you’re trying to do. Regardless, it
sounds like you’re looking for has_many, belongs_to, etc. Those are
the active record commands that allow you to make relationships
between tables. If that sounds like what you want, then go check
them out in Agile Rails book.

-Ben L.

The relation table describe the relationship between 2 entities in
entity table.
So as you say, in entity model:
has_and_belongs_to_many :entity

How can I define the relation table? As far as I know, the relation
table name will be “entities_entities”? and how can I define name of the
table columns (the entity_ids) ?

Thank you for your quick response, Ben.