I have this code in a controller:
respond_to do |format|
if @currency.save
flash[:notice] = 'Currency was successfully created.'
format.html { redirect_to(@currency) }
format.xml { render :xml => @currency,
:status => :created, :location => @currency }
else
format.html { render :action => "new" }
format.xml { render :xml => @currency.errors,
:status => :unprocessable_entity }
end
I have this code in the associated AR model:
# save
#
# Override AR save method to catch DBMS specific errors
# such as uniqueness constraint violations
def save
super
rescue ActiveRecord::StatementInvalid => this_exception
errors.add_to_base(hll_ar_exception(this_exception))
end
When I attempt to add a record in violation of a uniqueness constraint
then hll_ar_exception catches the dbms error and returns. If the error
is something else then it raises the original error again.
I expect that if the custom error handler returns a value to the
instance save method then a Rails error is raised with the provided text
and displayed in the view. However, this does not happen. Instead I
receive a record added successfully notice, even though the new row is
not actually inserted.
Further, if I make this one change to the model code:
# save
#
# Override AR save method to catch DBMS specific errors
# such as uniqueness constraint violations
def save
super
rescue ActiveRecord::StatementInvalid => this_exception
errors.add_to_base(hll_ar_exception(this_exception))
puts hll_ar_exception(this_exception) ##### <=== add this line
end
Then I do get the error message returned from hll_ar_exception displayed
in the view as an error with the appropriate field highlighted.
Can somebody explain to me what is going on?
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