def _get_field_map(cls):
     """
     Return metadata for each field defined on this model, to aid in serializing
     and exporing data.
     """
     return OrderedDict([
         ('org_id', {
             'sql': 'organization.uuid',
             'label': 'unit:id:admin',
             'serializer': cls.serializers['string'],
         }),
         ('name', {
             'sql': 'organization.name',
             'label': Organization.get_spreadsheet_field_name('name'),
             'serializer': cls.serializers['identity'],
         }),
         ('name_confidence', {
             'sql': 'organization.name_confidence',
             'label': Organization.get_spreadsheet_confidence_field_name('name'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('division_id', {
             'sql': 'organization.division_id',
             'label': Organization.get_spreadsheet_field_name('division_id'),
             'serializer': cls.serializers['division_id'],
         }),
         ('division_id_confidence', {
             'sql': 'organization.division_id_confidence',
             'label': Organization.get_spreadsheet_confidence_field_name('division_id'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('classifications', {
             'sql': 'organization.classifications',
             'label': Organization.get_spreadsheet_field_name('classification'),
             'serializer': cls.serializers['list'],
         }),
         ('classifications_confidence', {
             'sql': 'organization.classifications_confidence',
             'label': Organization.get_spreadsheet_confidence_field_name('classification'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('aliases', {
             'sql': 'organization.aliases',
             'label': Organization.get_spreadsheet_field_name('aliases'),
             'serializer': cls.serializers['list'],
         }),
         ('aliases_confidence', {
             'sql': 'organization.aliases_confidence',
             'label': Organization.get_spreadsheet_confidence_field_name('aliases'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('firstciteddate', {
             'sql': 'organization.first_cited_date',
             'label': Organization.get_spreadsheet_field_name('firstciteddate'),
             'serializer': cls.serializers['identity'],
         }),
         ('firstciteddate_confidence', {
             'sql': 'organization.first_cited_date_confidence',
             'label': Organization.get_spreadsheet_confidence_field_name('firstciteddate'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('lastciteddate', {
             'sql': 'organization.last_cited_date',
             'label': Organization.get_spreadsheet_field_name('lastciteddate'),
             'serializer': cls.serializers['identity'],
         }),
         ('lastciteddate_confidence', {
             'sql': 'organization.last_cited_date_confidence',
             'label': Organization.get_spreadsheet_confidence_field_name('lastciteddate'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('realstart', {
             'sql': 'organization.real_start',
             'label': Organization.get_spreadsheet_field_name('realstart'),
             'serializer': cls.serializers['identity'],
         }),
         ('realstart_confidence', {
             'sql': 'organization.real_start_confidence',
             'label': Organization.get_spreadsheet_confidence_field_name('realstart'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('open_ended', {
             'sql': 'organization.open_ended',
             'label': Organization.get_spreadsheet_field_name('open_ended'),
             'serializer': cls.serializers['identity'],
         }),
         ('open_ended_confidence', {
             'sql': 'organization.open_ended_confidence',
             'label': Organization.get_spreadsheet_confidence_field_name('open_ended'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_id', {
             'sql': 'person.uuid',
             'label': 'person:admin:id',
             'serializer': cls.serializers['string'],
         }),
         ('person_id_confidence', {
             'sql': 'membership.person_id_confidence',
             'label': 'person:posting:confidence',
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_name', {
             'sql': 'person.name',
             'label': Person.get_spreadsheet_field_name('name'),
             'serializer': cls.serializers['identity'],
         }),
         ('person_name_confidence', {
             'sql': 'person.name_confidence',
             'label': Person.get_spreadsheet_confidence_field_name('name'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_aliases', {
             'sql': 'person.aliases',
             'label': Person.get_spreadsheet_field_name('aliases'),
             'serializer': cls.serializers['list'],
         }),
         ('person_aliases_confidence', {
             'sql': 'person.aliases_confidence',
             'label': Person.get_spreadsheet_confidence_field_name('aliases'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_division_id', {
             'sql': 'person.division_id',
             'label': Person.get_spreadsheet_field_name('division_id'),
             'serializer': cls.serializers['division_id'],
         }),
         ('person_division_id_confidence', {
             'sql': 'person.division_id_confidence',
             'label': Person.get_spreadsheet_confidence_field_name('division_id'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_date_of_birth', {
             'sql': 'person.date_of_birth',
             'label': PersonBiography.get_spreadsheet_field_name('date_of_birth'),
             'serializer': cls.serializers['list'],
         }),
         ('person_date_of_birth_confidence', {
             'sql': 'person.date_of_birth_confidence',
             'label': PersonBiography.get_spreadsheet_confidence_field_name('date_of_birth'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_date_of_death', {
             'sql': 'person.date_of_death',
             'label': PersonBiography.get_spreadsheet_field_name('date_of_death'),
             'serializer': cls.serializers['list'],
         }),
         ('person_date_of_death_confidence', {
             'sql': 'person.date_of_death_confidence',
             'label': PersonBiography.get_spreadsheet_confidence_field_name('date_of_death'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_deceased', {
             'sql': 'person.deceased',
             'label': PersonBiography.get_spreadsheet_field_name('deceased'),
             'serializer': cls.serializers['list'],
         }),
         ('person_deceased_confidence', {
             'sql': 'person.deceased_confidence',
             'label': PersonBiography.get_spreadsheet_confidence_field_name('deceased'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_account_types', {
             'sql': 'person.account_types',
             'label': PersonExtra.get_spreadsheet_field_name('account_type'),
             'serializer': cls.serializers['list'],
         }),
         ('person_account_types_confidence', {
             'sql': 'person.account_types_confidence',
             'label': PersonExtra.get_spreadsheet_confidence_field_name('account_type'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_accounts', {
             'sql': 'person.accounts',
             'label': PersonExtra.get_spreadsheet_field_name('account'),
             'serializer': cls.serializers['list'],
         }),
         ('person_accounts_confidence', {
             'sql': 'person.accounts_confidence',
             'label': PersonExtra.get_spreadsheet_confidence_field_name('account'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_external_link_descriptions', {
             'sql': 'person.external_link_descriptions',
             'label': PersonExtra.get_spreadsheet_field_name('external_link_description'),
             'serializer': cls.serializers['list'],
         }),
         ('person_external_link_descriptions_confidence', {
             'sql': 'person.external_link_descriptions_confidence',
             'label': PersonExtra.get_spreadsheet_confidence_field_name('external_link_description'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_media_descriptions', {
             'sql': 'person.media_descriptions',
             'label': PersonExtra.get_spreadsheet_field_name('media_description'),
             'serializer': cls.serializers['list'],
         }),
         ('person_media_descriptions_confidence', {
             'sql': 'person.media_descriptions_confidence',
             'label': PersonExtra.get_spreadsheet_confidence_field_name('media_description'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_notes', {
             'sql': 'person.notes',
             'label': PersonExtra.get_spreadsheet_field_name('notes'),
             'serializer': cls.serializers['list'],
         }),
         ('person_notes_confidence', {
             'sql': 'person.notes_confidence',
             'label': PersonExtra.get_spreadsheet_confidence_field_name('notes'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_role', {
             'sql': 'membership.role',
             'label': MembershipPerson.get_spreadsheet_field_name('role'),
             'serializer': cls.serializers['identity'],
         }),
         ('person_role_confidence', {
             'sql': 'membership.role_confidence',
             'label': MembershipPerson.get_spreadsheet_confidence_field_name('role'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_rank', {
             'sql': 'membership.rank',
             'label': MembershipPerson.get_spreadsheet_field_name('rank'),
             'serializer': cls.serializers['identity'],
         }),
         ('person_rank_confidence', {
             'sql': 'membership.rank_confidence',
             'label': MembershipPerson.get_spreadsheet_confidence_field_name('rank'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_title', {
             'sql': 'membership.title',
             'label': MembershipPerson.get_spreadsheet_field_name('title'),
             'serializer': cls.serializers['identity'],
         }),
         ('person_title_confidence', {
             'sql': 'membership.title_confidence',
             'label': MembershipPerson.get_spreadsheet_confidence_field_name('title'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_firstciteddate', {
             'sql': 'membership.first_cited_date',
             'label': MembershipPerson.get_spreadsheet_field_name('firstciteddate'),
             'serializer': cls.serializers['identity'],
         }),
         ('person_firstciteddate_year', {
             'sql': 'membership.first_cited_date_year',
             'label': MembershipPerson.get_spreadsheet_field_name('firstciteddate') + ':year',
             'serializer': cls.serializers['identity'],
         }),
         ('person_firstciteddate_month', {
             'sql': 'membership.first_cited_date_month',
             'label': MembershipPerson.get_spreadsheet_field_name('firstciteddate') + ':month',
             'serializer': cls.serializers['identity'],
         }),
         ('person_firstciteddate_day', {
             'sql': 'membership.first_cited_date_day',
             'label': MembershipPerson.get_spreadsheet_field_name('firstciteddate') + ':day',
             'serializer': cls.serializers['identity'],
         }),
         ('person_firstciteddate_confidence', {
             'sql': 'membership.first_cited_date_confidence',
             'label': MembershipPerson.get_spreadsheet_confidence_field_name('firstciteddate'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_realstart', {
             'sql': 'membership.real_start',
             'label': MembershipPerson.get_spreadsheet_field_name('realstart'),
             'serializer': cls.serializers['identity'],
         }),
         ('person_realstart_confidence', {
             'sql': 'membership.real_start_confidence',
             'label': MembershipPerson.get_spreadsheet_confidence_field_name('realstart'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_startcontext', {
             'sql': 'membership.start_context',
             'label': MembershipPerson.get_spreadsheet_field_name('startcontext'),
             'serializer': cls.serializers['identity'],
         }),
         ('person_startcontext_confidence', {
             'sql': 'membership.start_context_confidence',
             'label': MembershipPerson.get_spreadsheet_confidence_field_name('startcontext'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_lastciteddate', {
             'sql': 'membership.last_cited_date',
             'label': MembershipPerson.get_spreadsheet_field_name('lastciteddate'),
             'serializer': cls.serializers['identity'],
         }),
         ('person_lastciteddate_year', {
             'sql': 'membership.last_cited_date_year',
             'label': MembershipPerson.get_spreadsheet_field_name('lastciteddate') + ':year',
             'serializer': cls.serializers['identity'],
         }),
         ('person_lastciteddate_month', {
             'sql': 'membership.last_cited_date_month',
             'label': MembershipPerson.get_spreadsheet_field_name('lastciteddate') + ':month',
             'serializer': cls.serializers['identity'],
         }),
         ('person_lastciteddate_day', {
             'sql': 'membership.last_cited_date_day',
             'label': MembershipPerson.get_spreadsheet_field_name('lastciteddate') + ':day',
             'serializer': cls.serializers['identity'],
         }),
         ('person_lastciteddate_confidence', {
             'sql': 'membership.last_cited_date_confidence',
             'label': MembershipPerson.get_spreadsheet_confidence_field_name('lastciteddate'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_realend', {
             'sql': 'membership.real_end',
             'label': MembershipPerson.get_spreadsheet_field_name('realend'),
             'serializer': cls.serializers['identity'],
         }),
         ('person_realend_confidence', {
             'sql': 'membership.real_end_confidence',
             'label': MembershipPerson.get_spreadsheet_confidence_field_name('realend'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
         ('person_endcontext', {
             'sql': 'membership.end_context',
             'label': MembershipPerson.get_spreadsheet_field_name('endcontext'),
             'serializer': cls.serializers['identity'],
         }),
         ('person_endcontext_confidence', {
             'sql': 'membership.end_context_confidence',
             'label': MembershipPerson.get_spreadsheet_confidence_field_name('endcontext'),
             'confidence': True,
             'serializer': cls.serializers['identity'],
         }),
     ])