Module: Switchman::ActiveRecord::FinderMethods

Defined in:
lib/switchman/active_record/finder_methods.rb

Instance Method Summary collapse

Instance Method Details

#exists?(conditions = :none) ⇒ Boolean

Returns:

  • (Boolean) 


33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
 
# File 'lib/switchman/active_record/finder_methods.rb', line 33

def exists?(conditions = :none)
  conditions = conditions.id if ::ActiveRecord::Base === conditions
  return false if !conditions

  if ::Rails.version >= '4.1'
    relation = apply_join_dependency(self, construct_join_dependency)
    return false if ::ActiveRecord::NullRelation === relation
  else
    join_dependency = construct_join_dependency_for_association_find
    relation = construct_relation_for_association_find(join_dependency)
  end

  relation = relation.except(:select, :order).select("1 AS one").limit(1)

  case conditions
  when Array, Hash
    relation = relation.where(conditions)
  else
    relation = relation.where(table[primary_key].eq(conditions)) if conditions != :none
  end

  args = [relation, "#{name} Exists"]
  args << relation.bind_values if ::Rails.version >= '4.1'
  activate { return true if connection.select_value(*args) }
  false
rescue
  raise if ::Rails.version >= '4.1' || !(::ActiveRecord::ThrowResult === $!)
  false
end

#find_one(id) ⇒ Object 



4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
 
# File 'lib/switchman/active_record/finder_methods.rb', line 4

def find_one(id)
  if shard_source_value != :implicit
    return self.activate { super(Shard.relative_id_for(id, Shard.current(klass.shard_category), primary_shard)) }
  end

  local_id, shard = Shard.local_id_for(id)
  if shard
    if ::Rails.version < '4.2'
      # find_one uses binds, so we can't depend on QueryMethods
      # catching it
      begin
        old_shard_value = shard_value
        self.shard_value = shard
        super(local_id)
      ensure
        self.shard_value = old_shard_value
      end
    else
      shard.activate { super(local_id) }
    end
  else
    super
  end
end

#find_or_instantiator_by_attributes(match, attributes, *args) ⇒ Object 



29
30
31
 
# File 'lib/switchman/active_record/finder_methods.rb', line 29

def find_or_instantiator_by_attributes(match, attributes, *args)
  primary_shard.activate { super }
end