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) 


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# File 'lib/switchman/active_record/finder_methods.rb', line 51

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'
  relation.activate { return true if connection.select_value(*args) }
  false
rescue
  raise if ::Rails.version >= '4.1' || !(::ActiveRecord::ThrowResult === $!)
  false
end

#find_one(id, call_super: false) ⇒ Object 



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# File 'lib/switchman/active_record/finder_methods.rb', line 4

def find_one(id, call_super: false)
  return super(id) unless klass.integral_id?
  return super(id) if call_super

  if shard_source_value != :implicit
    current_shard = Shard.current(klass.shard_category)
    result = self.activate do |relation, shard|
      current_id = Shard.relative_id_for(id, current_shard, shard)
      # current_id will be nil for non-integral id
      next unless current_id
      # skip the shard if the object can't be on it. unless we're only looking at one shard;
      # we might be expecting a shadow object
      next if current_id > Shard::IDS_PER_SHARD && self.all_shards.length > 1
      relation.send(:find_one, current_id, call_super: true)
    end
    if result.is_a?(Array)
      result = result.first
    end
    # we may have skipped all shards
    raise_record_not_found_exception!(id, 0, 1) unless result
    return result
  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(id)
  end
end

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



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# File 'lib/switchman/active_record/finder_methods.rb', line 47

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