Module: LowCardTables::ActiveRecord::Relation

Included in:
ActiveRecord::Relation
Defined in:
lib/low_card_tables/active_record/relation.rb

Overview

This module gets included into ::ActiveRecord::Relation, and is the reason that you can say, for example:

User.where(:deleted => false)

…when :deleted is actually an attribute on a referenced low-card table. It overrides #where to call LowCardTables::HasLowCardTable::LowCardDynamicMethodManager#scope_from_query if this is a table that has any associated low-card tables; that method, in turn, knows how to create a proper WHERE clause for low-card attributes.

Instance Method Summary collapse

Instance Method Details

#where(*args) ⇒ Object

Overrides ::ActiveRecord::Relation#where to add support for low-card tables.



13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/low_card_tables/active_record/relation.rb', line 13

def where(*args)
  # Escape early if this is a model that has nothing to do with any low-card tables.
  return super(*args) unless has_any_low_card_tables?

  if args.length == 1 && args[0].kind_of?(Hash)
    # This is a gross hack -- our overridden #where calls LowCardDynamicMethodManager#scope_from_query,
    # but that, in turn, needs to call #where, and we don't want an infinite mutual recursion. So, if we
    # see :_low_card_direct in the Hash passed in, we remove it and then go straight to the superclass --
    # i.e., this is the 'escape hatch' for LowCardDynamicMethodManager#scope_from_query.
    direct = args[0].delete(:_low_card_direct)

    if direct
      super(*args)
    else
      _low_card_dynamic_method_manager.scope_from_query(self, args[0])
    end
  else
    super(*args)
  end
end