All,
I am relative new to Rails and struggle with following STI issue:
A parent class "Reading" has many subclasses "ElectricityReading",
"GasReading", ...
I wrote a method in the Reading class to update calculated columns in
each record, the logic goes like this:
1. Find first record
first = find(:first, :conditions => ["unit_id = ?", unit_id], :order
=> "date asc" )
# get values of some columns and store in local variables
2. Find all records, perform the calculations and store in calculated
fields
find(:all, :conditions => ["unit_id = ?", unit_id], :order => "date
asc" ).each do |r|
# get column values of r, calculate and save
3. Controller calls the method after each create or entry
ElectricityReading.calculate(unit_id)
The problem:
Instead of
SELECT * FROM "readings" WHERE (unit_id = 1) AND ( ("readings"."type"
= 'ElectricityReading' ) Limit 1
SELECT * FROM "readings" WHERE (unit_id = 1) AND ( ("readings"."type"
= 'ElectricityReading' )
I get
SELECT * FROM "readings" WHERE ("readings"."id" = '10') LIMIT 1
SELECT * FROM "readings" WHERE ("readings"."id" = '10')
So the calculations are performed on all Reading objects rather than
only the ElectricityReading object.
The funny thing is that it seems to work as expected in the console,
but fails as above using the built in server.
Is this a bug in STI? Would it be solved by using a different type of
inheritance?
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