search for: start_dt

Hi All, This might be simple question, I need to retrive data for modelling from the databases. Eveytime date values changes so I countnot fix date value in the code, it is required to pass as parameter. When I pass the date as parameter, it throws error. (ERROR: column "start_dt" does not exist Position: 285) My script is as below, please guide me where am I going wrong? All parameters are passed correctly, when start_dt and end_dt are replaced by '2010-11-01' and '2011-01-31' respectively in the query code works fine without any errors. ############...

I''m trying to assign a parent foreign key value using collection_select from my child "new" form. The problem I''m having is if I do not make a selection, I get the following error instead of the Rails validates_presence_of error: You have a nil object when you didn''t expect it! You might have expected an instance of Array. The error occurred while evaluating

...the list elements; then I would like to rbind the extracted rows into a new dataframe containing all of the extracted rows from all of the list elements. I don't need any help with the code itself, it works fine for one chunk of data (e.g., a single dataframe). The code is: t0<-match(times$START_DT, data$DATETIME) #MAKE A VECTOR OF START TIMES t1<-match(times$STOP_DT, data$DATETIME) #MAKE A VECTOR OF STOP TIMES indices<-mapply(FUN = ":", t0, t1) #MAKES A LIST, EACH ELEMENT CONTAINS INDICES OF TIMES CORRESPONDING TO ONE WETLAND idex<-times[rep(1:nrow(times), sapply(indices,...