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 38

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

  relation = apply_join_dependency(self, construct_join_dependency)
  return false if ::ActiveRecord::NullRelation === relation

  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

  relation.activate do |shard_rel|
    return true if connection.select_value(shard_rel, "#{name} Exists", shard_rel.bind_values)
  end
  false
end

#find_one(id) ⇒ Object 



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

def find_one(id)
  return super(id) unless klass.integral_id?

  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.call_super(:find_one, FinderMethods, current_id)
    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
    shard.activate { super(local_id) }
  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 34

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