class PgSearch::Configuration::Column

def alias
  Configuration.alias(association.subselect_alias, @column_name)
end

def column_name
  @connection.quote_column_name(@column_name)
end

def expression
  full_name
end

def full_name
  "#{table_name}.#{column_name}"
end

def initialize(column_name, weight, model)
  @column_name = column_name.to_s
  @weight = weight
  @model = model
  @connection = model.connection
end

def table_name
  @connection.quote_table_name(@model.table_name)
end

def to_sql
  "coalesce(#{expression}::text, '')"
end