src/mango/src/mango_idx.erl - couchdb - Git at Google

 % Licensed under the Apache License, Version 2.0 (the "License"); you may not
 % use this file except in compliance with the License. You may obtain a copy of
 % the License at
 %
 % http://www.apache.org/licenses/LICENSE-2.0
 %
 % Unless required by applicable law or agreed to in writing, software
 % distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 % WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 % License for the specific language governing permissions and limitations under
 % the License.

 % This module is for the "index object" as in, the data structure
 % representing an index. Not to be confused with mango_index which
 % contains APIs for managing indexes.

 -module(mango_idx).


 -export([
     list/1,
     recover/1,

     new/2,
     validate_new/2,
     add/2,
     remove/2,
     from_ddoc/2,
     special/1,

     dbname/1,
     ddoc/1,
     name/1,
     type/1,
     def/1,
     opts/1,
     columns/1,
     is_usable/3,
     start_key/2,
     end_key/2,
     cursor_mod/1,
     idx_mod/1,
     to_json/1,
     delete/4,
     get_usable_indexes/3,
     get_partial_filter_selector/1
 ]).


 -include_lib("couch/include/couch_db.hrl").
 -include("mango.hrl").
 -include("mango_idx.hrl").


 list(Db) ->
     {ok, Indexes} = ddoc_cache:open(db_to_name(Db), ?MODULE),
     Indexes.


 get_usable_indexes(Db, Selector, Opts) ->
     ExistingIndexes = mango_idx:list(Db),

     GlobalIndexes = mango_cursor:remove_indexes_with_partial_filter_selector(ExistingIndexes),
     UserSpecifiedIndex = mango_cursor:maybe_filter_indexes_by_ddoc(ExistingIndexes, Opts),
     UsableIndexes0 = lists:usort(GlobalIndexes ++ UserSpecifiedIndex),

     SortFields = get_sort_fields(Opts),
     UsableFilter = fun(I) -> is_usable(I, Selector, SortFields) end,

     case lists:filter(UsableFilter, UsableIndexes0) of
         [] ->
             ?MANGO_ERROR({no_usable_index, missing_sort_index});
         UsableIndexes ->
             UsableIndexes
     end.


 recover(Db) ->
     {ok, DDocs0} = mango_util:open_ddocs(Db),
     Pred = fun({Props}) ->
         case proplists:get_value(<<"language">>, Props) of
             <<"query">> -> true;
             _ -> false
         end
     end,
     DDocs = lists:filter(Pred, DDocs0),
     Special = special(Db),
     {ok, Special ++ lists:flatmap(fun(Doc) ->
         from_ddoc(Db, Doc)
     end, DDocs)}.


 get_sort_fields(Opts) ->
     case lists:keyfind(sort, 1, Opts) of
         {sort, Sort} ->
             mango_sort:fields(Sort);
         _ ->
             []
     end.


 new(Db, Opts) ->
     Def = get_idx_def(Opts),
     Type = get_idx_type(Opts),
     IdxName = get_idx_name(Def, Opts),
     DDoc = get_idx_ddoc(Def, Opts),
     {ok, #idx{
         dbname = db_to_name(Db),
         ddoc = DDoc,
         name = IdxName,
         type = Type,
         def = Def,
         opts = filter_opts(Opts)
     }}.


 validate_new(Idx, Db) ->
     Mod = idx_mod(Idx),
     Mod:validate_new(Idx, Db).


 add(DDoc, Idx) ->
     Mod = idx_mod(Idx),
     {ok, NewDDoc} = Mod:add(DDoc, Idx),
     % Round trip through JSON for normalization
     Body = ?JSON_DECODE(?JSON_ENCODE(NewDDoc#doc.body)),
     {ok, NewDDoc#doc{body = Body}}.


 remove(DDoc, Idx) ->
     Mod = idx_mod(Idx),
     {ok, NewDDoc} = Mod:remove(DDoc, Idx),
     % Round trip through JSON for normalization
     Body = ?JSON_DECODE(?JSON_ENCODE(NewDDoc#doc.body)),
     {ok, NewDDoc#doc{body = Body}}.


 delete(Filt, Db, Indexes, DelOpts) ->
     case lists:filter(Filt, Indexes) of
         [Idx] ->
             {ok, DDoc} = mango_util:load_ddoc(Db, mango_idx:ddoc(Idx)),
             {ok, NewDDoc} = mango_idx:remove(DDoc, Idx),
             FinalDDoc = case NewDDoc#doc.body of
                 {[{<<"language">>, <<"query">>}]} ->
                     NewDDoc#doc{deleted = true, body = {[]}};
                 _ ->
                     NewDDoc
             end,
             case mango_crud:insert(Db, FinalDDoc, DelOpts) of
                 {ok, _} ->
                     {ok, true};
                 Error ->
                     {error, Error}
             end;
         [] ->
             {error, not_found}
     end.


 from_ddoc(Db, {Props}) ->
     DbName = db_to_name(Db),
     DDoc = proplists:get_value(<<"_id">>, Props),

     case proplists:get_value(<<"language">>, Props) of
         <<"query">> -> ok;
         _ ->
             ?MANGO_ERROR(invalid_query_ddoc_language)
     end,
     IdxMods = case module_loaded(dreyfus_index) of
         true ->
             [mango_idx_view, mango_idx_text];
         false ->
             [mango_idx_view]
     end,
     Idxs = lists:flatmap(fun(Mod) -> Mod:from_ddoc({Props}) end, IdxMods),
     lists:map(fun(Idx) ->
         Idx#idx{
             dbname = DbName,
             ddoc = DDoc
         }
     end, Idxs).


 special(Db) ->
     AllDocs = #idx{
         dbname = db_to_name(Db),
         name = <<"_all_docs">>,
         type = <<"special">>,
         def = all_docs,
         opts = []
     },
     % Add one for _update_seq
     [AllDocs].


 dbname(#idx{dbname=DbName}) ->
     DbName.


 ddoc(#idx{ddoc=DDoc}) ->
     DDoc.


 name(#idx{name=Name}) ->
     Name.


 type(#idx{type=Type}) ->
     Type.


 def(#idx{def=Def}) ->
     Def.


 opts(#idx{opts=Opts}) ->
     Opts.


 to_json(#idx{}=Idx) ->
     Mod = idx_mod(Idx),
     Mod:to_json(Idx).


 columns(#idx{}=Idx) ->
     Mod = idx_mod(Idx),
     Mod:columns(Idx).


 is_usable(#idx{}=Idx, Selector, SortFields) ->
     Mod = idx_mod(Idx),
     Mod:is_usable(Idx, Selector, SortFields).


 start_key(#idx{}=Idx, Ranges) ->
     Mod = idx_mod(Idx),
     Mod:start_key(Ranges).


 end_key(#idx{}=Idx, Ranges) ->
     Mod = idx_mod(Idx),
     Mod:end_key(Ranges).


 cursor_mod(#idx{type = <<"json">>}) ->
     mango_cursor_view;
 cursor_mod(#idx{def = all_docs, type= <<"special">>}) ->
     mango_cursor_special;
 cursor_mod(#idx{type = <<"text">>}) ->
     case module_loaded(dreyfus_index) of
         true ->
             mango_cursor_text;
         false ->
             ?MANGO_ERROR({index_service_unavailable, <<"text">>})
     end.


 idx_mod(#idx{type = <<"json">>}) ->
     mango_idx_view;
 idx_mod(#idx{type = <<"special">>}) ->
     mango_idx_special;
 idx_mod(#idx{type = <<"text">>}) ->
     case module_loaded(dreyfus_index) of
         true ->
             mango_idx_text;
         false ->
             ?MANGO_ERROR({index_service_unavailable, <<"text">>})
     end.


 db_to_name(Name) when is_binary(Name) ->
     Name;
 db_to_name(Name) when is_list(Name) ->
     iolist_to_binary(Name);
 db_to_name(Db) ->
     couch_db:name(Db).


 get_idx_def(Opts) ->
     case proplists:get_value(def, Opts) of
         undefined ->
             ?MANGO_ERROR(no_index_definition);
         Def ->
             Def
     end.


 get_idx_type(Opts) ->
     case proplists:get_value(type, Opts) of
         <<"json">> -> <<"json">>;
         <<"text">> -> case module_loaded(dreyfus_index) of
             true ->
                 <<"text">>;
             false ->
                 ?MANGO_ERROR({index_service_unavailable, <<"text">>})
             end;
         %<<"geo">> -> <<"geo">>;
         undefined -> <<"json">>;
         BadType ->
             ?MANGO_ERROR({invalid_index_type, BadType})
     end.


 get_idx_ddoc(Idx, Opts) ->
     case proplists:get_value(ddoc, Opts) of
         <<"_design/", _Rest/binary>> = Name ->
             Name;
         Name when is_binary(Name) ->
             <<"_design/", Name/binary>>;
         _ ->
             Bin = gen_name(Idx, Opts),
             <<"_design/", Bin/binary>>
     end.


 get_idx_name(Idx, Opts) ->
     case proplists:get_value(name, Opts) of
         Name when is_binary(Name) ->
             Name;
         _ ->
             gen_name(Idx, Opts)
     end.


 gen_name(Idx, Opts0) ->
     Opts = lists:usort(Opts0),
     TermBin = term_to_binary({Idx, Opts}),
     Sha = crypto:hash(sha, TermBin),
     mango_util:enc_hex(Sha).


 filter_opts([]) ->
     [];
 filter_opts([{user_ctx, _} | Rest]) ->
     filter_opts(Rest);
 filter_opts([{ddoc, _} | Rest]) ->
     filter_opts(Rest);
 filter_opts([{name, _} | Rest]) ->
     filter_opts(Rest);
 filter_opts([{type, _} | Rest]) ->
     filter_opts(Rest);
 filter_opts([{w, _} | Rest]) ->
     filter_opts(Rest);
 filter_opts([Opt | Rest]) ->
     [Opt | filter_opts(Rest)].


 get_partial_filter_selector(#idx{def = Def}) when Def =:= all_docs; Def =:= undefined ->
     undefined;
 get_partial_filter_selector(#idx{def = {Def}}) ->
     case proplists:get_value(<<"partial_filter_selector">>, Def) of
         undefined -> get_legacy_selector(Def);
         {[]} -> undefined;
         Selector -> Selector
     end.


 % Partial filter selectors is supported in text indexes via the selector field
 % This adds backwards support for existing indexes that might have a selector in it
 get_legacy_selector(Def) ->
     case proplists:get_value(<<"selector">>, Def) of
         undefined -> undefined;
         {[]} -> undefined;
         Selector -> Selector
     end.

 -ifdef(TEST).
 -include_lib("eunit/include/eunit.hrl").

 index(SelectorName, Selector) ->
     {
         idx,<<"mango_test_46418cd02081470d93290dc12306ebcb">>,
            <<"_design/57e860dee471f40a2c74ea5b72997b81dda36a24">>,
            <<"Selected">>,<<"json">>,
            {[{<<"fields">>,{[{<<"location">>,<<"asc">>}]}},
              {SelectorName,{Selector}}]},
            [{<<"def">>,{[{<<"fields">>,[<<"location">>]}]}}]
     }.

 get_partial_filter_all_docs_test() ->
     Idx = #idx{def = all_docs},
     ?assertEqual(undefined, get_partial_filter_selector(Idx)).

 get_partial_filter_undefined_def_test() ->
     Idx = #idx{def = undefined},
     ?assertEqual(undefined, get_partial_filter_selector(Idx)).

 get_partial_filter_selector_default_test() ->
     Idx = index(<<"partial_filter_selector">>, []),
     ?assertEqual(undefined, get_partial_filter_selector(Idx)).

 get_partial_filter_selector_missing_test() ->
     Idx = index(<<"partial_filter_selector">>, []),
     ?assertEqual(undefined, get_partial_filter_selector(Idx)).

 get_partial_filter_selector_with_selector_test() ->
     Selector = [{<<"location">>,{[{<<"$gt">>,<<"FRA">>}]}}],
     Idx = index(<<"partial_filter_selector">>, Selector),
     ?assertEqual({Selector}, get_partial_filter_selector(Idx)).

 get_partial_filter_selector_with_legacy_selector_test() ->
     Selector = [{<<"location">>,{[{<<"$gt">>,<<"FRA">>}]}}],
     Idx = index(<<"selector">>, Selector),
     ?assertEqual({Selector}, get_partial_filter_selector(Idx)).

 get_partial_filter_selector_with_legacy_default_selector_test() ->
     Idx = index(<<"selector">>, []),
     ?assertEqual(undefined, get_partial_filter_selector(Idx)).


 get_idx_ddoc_name_only_test() ->
     Opts = [{ddoc, <<"foo">>}],
     ?assertEqual(<<"_design/foo">>, get_idx_ddoc({}, Opts)).

 get_idx_ddoc_design_slash_name_test() ->
     Opts = [{ddoc, <<"_design/foo">>}],
     ?assertEqual(<<"_design/foo">>, get_idx_ddoc({}, Opts)).

 -endif.
	% Licensed under the Apache License, Version 2.0 (the "License"); you may not
	% use this file except in compliance with the License. You may obtain a copy of
	% the License at
	%
	% http://www.apache.org/licenses/LICENSE-2.0
	%
	% Unless required by applicable law or agreed to in writing, software
	% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
	% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
	% License for the specific language governing permissions and limitations under
	% the License.

	% This module is for the "index object" as in, the data structure
	% representing an index. Not to be confused with mango_index which
	% contains APIs for managing indexes.

	-module(mango_idx).


	-export([
	list/1,
	recover/1,

	new/2,
	validate_new/2,
	add/2,
	remove/2,
	from_ddoc/2,
	special/1,

	dbname/1,
	ddoc/1,
	name/1,
	type/1,
	def/1,
	opts/1,
	columns/1,
	is_usable/3,
	start_key/2,
	end_key/2,
	cursor_mod/1,
	idx_mod/1,
	to_json/1,
	delete/4,
	get_usable_indexes/3,
	get_partial_filter_selector/1
	]).


	-include_lib("couch/include/couch_db.hrl").
	-include("mango.hrl").
	-include("mango_idx.hrl").


	list(Db) ->
	{ok, Indexes} = ddoc_cache:open(db_to_name(Db), ?MODULE),
	Indexes.


	get_usable_indexes(Db, Selector, Opts) ->
	ExistingIndexes = mango_idx:list(Db),

	GlobalIndexes = mango_cursor:remove_indexes_with_partial_filter_selector(ExistingIndexes),
	UserSpecifiedIndex = mango_cursor:maybe_filter_indexes_by_ddoc(ExistingIndexes, Opts),
	UsableIndexes0 = lists:usort(GlobalIndexes ++ UserSpecifiedIndex),

	SortFields = get_sort_fields(Opts),
	UsableFilter = fun(I) -> is_usable(I, Selector, SortFields) end,

	case lists:filter(UsableFilter, UsableIndexes0) of
	[] ->
	?MANGO_ERROR({no_usable_index, missing_sort_index});
	UsableIndexes ->
	UsableIndexes
	end.


	recover(Db) ->
	{ok, DDocs0} = mango_util:open_ddocs(Db),
	Pred = fun({Props}) ->
	case proplists:get_value(<<"language">>, Props) of
	<<"query">> -> true;
	_ -> false
	end
	end,
	DDocs = lists:filter(Pred, DDocs0),
	Special = special(Db),
	{ok, Special ++ lists:flatmap(fun(Doc) ->
	from_ddoc(Db, Doc)
	end, DDocs)}.


	get_sort_fields(Opts) ->
	case lists:keyfind(sort, 1, Opts) of
	{sort, Sort} ->
	mango_sort:fields(Sort);
	_ ->
	[]
	end.


	new(Db, Opts) ->
	Def = get_idx_def(Opts),
	Type = get_idx_type(Opts),
	IdxName = get_idx_name(Def, Opts),
	DDoc = get_idx_ddoc(Def, Opts),
	{ok, #idx{
	dbname = db_to_name(Db),
	ddoc = DDoc,
	name = IdxName,
	type = Type,
	def = Def,
	opts = filter_opts(Opts)
	}}.


	validate_new(Idx, Db) ->
	Mod = idx_mod(Idx),
	Mod:validate_new(Idx, Db).


	add(DDoc, Idx) ->
	Mod = idx_mod(Idx),
	{ok, NewDDoc} = Mod:add(DDoc, Idx),
	% Round trip through JSON for normalization
	Body = ?JSON_DECODE(?JSON_ENCODE(NewDDoc#doc.body)),
	{ok, NewDDoc#doc{body = Body}}.


	remove(DDoc, Idx) ->
	Mod = idx_mod(Idx),
	{ok, NewDDoc} = Mod:remove(DDoc, Idx),
	% Round trip through JSON for normalization
	Body = ?JSON_DECODE(?JSON_ENCODE(NewDDoc#doc.body)),
	{ok, NewDDoc#doc{body = Body}}.


	delete(Filt, Db, Indexes, DelOpts) ->
	case lists:filter(Filt, Indexes) of
	[Idx] ->
	{ok, DDoc} = mango_util:load_ddoc(Db, mango_idx:ddoc(Idx)),
	{ok, NewDDoc} = mango_idx:remove(DDoc, Idx),
	FinalDDoc = case NewDDoc#doc.body of
	{[{<<"language">>, <<"query">>}]} ->
	NewDDoc#doc{deleted = true, body = {[]}};
	_ ->
	NewDDoc
	end,
	case mango_crud:insert(Db, FinalDDoc, DelOpts) of
	{ok, _} ->
	{ok, true};
	Error ->
	{error, Error}
	end;
	[] ->
	{error, not_found}
	end.


	from_ddoc(Db, {Props}) ->
	DbName = db_to_name(Db),
	DDoc = proplists:get_value(<<"_id">>, Props),

	case proplists:get_value(<<"language">>, Props) of
	<<"query">> -> ok;
	_ ->
	?MANGO_ERROR(invalid_query_ddoc_language)
	end,
	IdxMods = case module_loaded(dreyfus_index) of
	true ->
	[mango_idx_view, mango_idx_text];
	false ->
	[mango_idx_view]
	end,
	Idxs = lists:flatmap(fun(Mod) -> Mod:from_ddoc({Props}) end, IdxMods),
	lists:map(fun(Idx) ->
	Idx#idx{
	dbname = DbName,
	ddoc = DDoc
	}
	end, Idxs).


	special(Db) ->
	AllDocs = #idx{
	dbname = db_to_name(Db),
	name = <<"_all_docs">>,
	type = <<"special">>,
	def = all_docs,
	opts = []
	},
	% Add one for _update_seq
	[AllDocs].


	dbname(#idx{dbname=DbName}) ->
	DbName.


	ddoc(#idx{ddoc=DDoc}) ->
	DDoc.


	name(#idx{name=Name}) ->
	Name.


	type(#idx{type=Type}) ->
	Type.


	def(#idx{def=Def}) ->
	Def.


	opts(#idx{opts=Opts}) ->
	Opts.


	to_json(#idx{}=Idx) ->
	Mod = idx_mod(Idx),
	Mod:to_json(Idx).


	columns(#idx{}=Idx) ->
	Mod = idx_mod(Idx),
	Mod:columns(Idx).


	is_usable(#idx{}=Idx, Selector, SortFields) ->
	Mod = idx_mod(Idx),
	Mod:is_usable(Idx, Selector, SortFields).


	start_key(#idx{}=Idx, Ranges) ->
	Mod = idx_mod(Idx),
	Mod:start_key(Ranges).


	end_key(#idx{}=Idx, Ranges) ->
	Mod = idx_mod(Idx),
	Mod:end_key(Ranges).


	cursor_mod(#idx{type = <<"json">>}) ->
	mango_cursor_view;
	cursor_mod(#idx{def = all_docs, type= <<"special">>}) ->
	mango_cursor_special;
	cursor_mod(#idx{type = <<"text">>}) ->
	case module_loaded(dreyfus_index) of
	true ->
	mango_cursor_text;
	false ->
	?MANGO_ERROR({index_service_unavailable, <<"text">>})
	end.


	idx_mod(#idx{type = <<"json">>}) ->
	mango_idx_view;
	idx_mod(#idx{type = <<"special">>}) ->
	mango_idx_special;
	idx_mod(#idx{type = <<"text">>}) ->
	case module_loaded(dreyfus_index) of
	true ->
	mango_idx_text;
	false ->
	?MANGO_ERROR({index_service_unavailable, <<"text">>})
	end.


	db_to_name(Name) when is_binary(Name) ->
	Name;
	db_to_name(Name) when is_list(Name) ->
	iolist_to_binary(Name);
	db_to_name(Db) ->
	couch_db:name(Db).


	get_idx_def(Opts) ->
	case proplists:get_value(def, Opts) of
	undefined ->
	?MANGO_ERROR(no_index_definition);
	Def ->
	Def
	end.


	get_idx_type(Opts) ->
	case proplists:get_value(type, Opts) of
	<<"json">> -> <<"json">>;
	<<"text">> -> case module_loaded(dreyfus_index) of
	true ->
	<<"text">>;
	false ->
	?MANGO_ERROR({index_service_unavailable, <<"text">>})
	end;
	%<<"geo">> -> <<"geo">>;
	undefined -> <<"json">>;
	BadType ->
	?MANGO_ERROR({invalid_index_type, BadType})
	end.


	get_idx_ddoc(Idx, Opts) ->
	case proplists:get_value(ddoc, Opts) of
	<<"_design/", _Rest/binary>> = Name ->
	Name;
	Name when is_binary(Name) ->
	<<"_design/", Name/binary>>;
	_ ->
	Bin = gen_name(Idx, Opts),
	<<"_design/", Bin/binary>>
	end.


	get_idx_name(Idx, Opts) ->
	case proplists:get_value(name, Opts) of
	Name when is_binary(Name) ->
	Name;
	_ ->
	gen_name(Idx, Opts)
	end.


	gen_name(Idx, Opts0) ->
	Opts = lists:usort(Opts0),
	TermBin = term_to_binary({Idx, Opts}),
	Sha = crypto:hash(sha, TermBin),
	mango_util:enc_hex(Sha).


	filter_opts([]) ->
	[];
	filter_opts([{user_ctx, _} \| Rest]) ->
	filter_opts(Rest);
	filter_opts([{ddoc, _} \| Rest]) ->
	filter_opts(Rest);
	filter_opts([{name, _} \| Rest]) ->
	filter_opts(Rest);
	filter_opts([{type, _} \| Rest]) ->
	filter_opts(Rest);
	filter_opts([{w, _} \| Rest]) ->
	filter_opts(Rest);
	filter_opts([Opt \| Rest]) ->
	[Opt \| filter_opts(Rest)].


	get_partial_filter_selector(#idx{def = Def}) when Def =:= all_docs; Def =:= undefined ->
	undefined;
	get_partial_filter_selector(#idx{def = {Def}}) ->
	case proplists:get_value(<<"partial_filter_selector">>, Def) of
	undefined -> get_legacy_selector(Def);
	{[]} -> undefined;
	Selector -> Selector
	end.


	% Partial filter selectors is supported in text indexes via the selector field
	% This adds backwards support for existing indexes that might have a selector in it
	get_legacy_selector(Def) ->
	case proplists:get_value(<<"selector">>, Def) of
	undefined -> undefined;
	{[]} -> undefined;
	Selector -> Selector
	end.

	-ifdef(TEST).
	-include_lib("eunit/include/eunit.hrl").

	index(SelectorName, Selector) ->
	{
	idx,<<"mango_test_46418cd02081470d93290dc12306ebcb">>,
	<<"_design/57e860dee471f40a2c74ea5b72997b81dda36a24">>,
	<<"Selected">>,<<"json">>,
	{[{<<"fields">>,{[{<<"location">>,<<"asc">>}]}},
	{SelectorName,{Selector}}]},
	[{<<"def">>,{[{<<"fields">>,[<<"location">>]}]}}]
	}.

	get_partial_filter_all_docs_test() ->
	Idx = #idx{def = all_docs},
	?assertEqual(undefined, get_partial_filter_selector(Idx)).

	get_partial_filter_undefined_def_test() ->
	Idx = #idx{def = undefined},
	?assertEqual(undefined, get_partial_filter_selector(Idx)).

	get_partial_filter_selector_default_test() ->
	Idx = index(<<"partial_filter_selector">>, []),
	?assertEqual(undefined, get_partial_filter_selector(Idx)).

	get_partial_filter_selector_missing_test() ->
	Idx = index(<<"partial_filter_selector">>, []),
	?assertEqual(undefined, get_partial_filter_selector(Idx)).

	get_partial_filter_selector_with_selector_test() ->
	Selector = [{<<"location">>,{[{<<"$gt">>,<<"FRA">>}]}}],
	Idx = index(<<"partial_filter_selector">>, Selector),
	?assertEqual({Selector}, get_partial_filter_selector(Idx)).

	get_partial_filter_selector_with_legacy_selector_test() ->
	Selector = [{<<"location">>,{[{<<"$gt">>,<<"FRA">>}]}}],
	Idx = index(<<"selector">>, Selector),
	?assertEqual({Selector}, get_partial_filter_selector(Idx)).

	get_partial_filter_selector_with_legacy_default_selector_test() ->
	Idx = index(<<"selector">>, []),
	?assertEqual(undefined, get_partial_filter_selector(Idx)).


	get_idx_ddoc_name_only_test() ->
	Opts = [{ddoc, <<"foo">>}],
	?assertEqual(<<"_design/foo">>, get_idx_ddoc({}, Opts)).

	get_idx_ddoc_design_slash_name_test() ->
	Opts = [{ddoc, <<"_design/foo">>}],
	?assertEqual(<<"_design/foo">>, get_idx_ddoc({}, Opts)).

	-endif.