Question

I’m having some trouble with a .where statement in rails. Can anybody help?

<% due_late = project.tasks.where(":date_due < ?", Date.today).count %>

Answer 1

date_due in this context is the column name as defined in the database, not the Ruby symbol :date_due.

<% due_late = project.tasks.where("date_due < ?", Date.today).count %>
#---------------------------------^^

Update after comments

It is necessary to differentiate the table name in a JOIN query if both tables have the same column name:

# Assuming it is tasks.date_due you are testing, rather than phases.date_due
<% due_late = project.tasks.where("tasks.date_due < ?", Date.today).count %>

As a point of advice, rather than perform this calculation in the view .erb file, it would be better to create a method in the model which returns the value.

def due_late
  tasks.where("tasks.date_due < ?", Date.today).count
end

Called in the view as

<%= project.due_late %>