I have a table Foo
that has a polymorphic belongs_to association called bar
. The foos
table has the standard bar_id
column. However, instead of a string-based bar_type
column, I have an integer bar_type_id
column. This column references the id
column in the table bar_types
. bar_types.name
holds the name of the class that represents the class of the particular bar
instance.
Does Rails (ideally >=2.3.10) allow for this type of polymorphic association?
We did it by overriding the
association_class
method in a new module and included it using the:extend
option. Also created a integer to string mapping hash to make things easier.In
config/initializers
directory or anywhere you like, create a file and define the hashINT_OBJECT_TYPE_TO_CLASSNAME = { 0 => "Project", 1 => "Task", 2 => "Timesheet" }
In comments.rb
There are two approaches for this.
First is easy:
Second could be tricky:
I'm making use of the polymorphic integer type gem, written by one of my co-workers. It's slightly easier to use than the examples given above, in my opinion. For example, after configuring the mapping, you change from:
to the new format:
I am not sure, but you can play around