class ActiveRecord::TableMetadata

def aggregated_with?(aggregation_name)
  klass && reflect_on_aggregation(aggregation_name)
end

def arel_attribute(column_name)
  if klass
    klass.arel_attribute(column_name, arel_table)
  else
    arel_table[column_name]
  end
end

def associated_predicate_builder(table_name)
  associated_table(table_name).predicate_builder
end

def associated_table(table_name)
  association = klass._reflect_on_association(table_name) || klass._reflect_on_association(table_name.to_s.singularize)
  if !association && table_name == arel_table.name
    self
  elsif association && !association.polymorphic?
    association_klass = association.klass
    arel_table = association_klass.arel_table.alias(table_name)
    TableMetadata.new(association_klass, arel_table, association)
  else
    type_caster = TypeCaster::Connection.new(klass, table_name)
    arel_table = Arel::Table.new(table_name, type_caster: type_caster)
    TableMetadata.new(nil, arel_table, association, type_caster)
  end
end

def associated_with?(association_name)
  klass && klass._reflect_on_association(association_name)
end

def has_column?(column_name)
  klass && klass.columns_hash.key?(column_name.to_s)
end

def initialize(klass, arel_table, association = nil, types = klass)
  @klass = klass
  @types = types
  @arel_table = arel_table
  @association = association
end

def polymorphic_association?
  association && association.polymorphic?
end

def predicate_builder
  if klass
    predicate_builder = klass.predicate_builder.dup
    predicate_builder.instance_variable_set(:@table, self)
    predicate_builder
  else
    PredicateBuilder.new(self)
  end
end

def reflect_on_aggregation(aggregation_name)
  klass.reflect_on_aggregation(aggregation_name)
end

def resolve_column_aliases(hash)
  new_hash = hash.dup
  hash.each_key do |key|
    if key.is_a?(Symbol) && new_key = klass.attribute_aliases[key.to_s]
      new_hash[new_key] = new_hash.delete(key)
    end
  end
  new_hash
end

def type(column_name)
  types.type_for_attribute(column_name)
end