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farmer_id
2008 May 27
2
HABTM using two columns
...I was wondering whether anyone could guide me to docu and code
examples how to create and use a has_and_belongs_to_many relationship
with a joining table where TWO columns are used to identify the
relation to TWO alternative tables.
Example:
table 1: mothers [mother_id, name]
table 2: fathers [father_id, name]
table 3: children [child_id, name]
joining table 4: children_parent [child_id, parent_id, parent_type]
''parent type'' can be either ''mother'' or ''father'', and depending on
this, the ''parent_id'' links to an entry in eithe...