mirror of
https://github.com/mongodb/mongo.git
synced 2024-12-01 01:21:03 +01:00
69 lines
1.7 KiB
JavaScript
69 lines
1.7 KiB
JavaScript
t = db.slice1;
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t.drop();
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t.insert({_id:1, a:[0,1,2,3,4,5,-5,-4,-3,-2,-1], b:1, c:1});
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// first three
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out = t.findOne({}, {a:{$slice:3}});
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assert.eq(out.a , [0,1,2], '1');
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// last three
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out = t.findOne({}, {a:{$slice:-3}});
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assert.eq(out.a , [-3, -2, -1], '2');
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// skip 2, limit 3
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out = t.findOne({}, {a:{$slice:[2, 3]}});
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assert.eq(out.a , [2,3,4], '3');
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// skip to fifth from last, limit 4
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out = t.findOne({}, {a:{$slice:[-5, 4]}});
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assert.eq(out.a , [-5, -4, -3, -2], '4');
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// skip to fifth from last, limit 10
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out = t.findOne({}, {a:{$slice:[-5, 10]}});
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assert.eq(out.a , [-5, -4, -3, -2, -1], '5');
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// interaction with other fields
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out = t.findOne({}, {a:{$slice:3}});
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assert.eq(out.a , [0,1,2], 'A 1');
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assert.eq(out.b , 1, 'A 2');
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assert.eq(out.c , 1, 'A 3');
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out = t.findOne({}, {a:{$slice:3}, b:true});
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assert.eq(out.a , [0,1,2], 'B 1');
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assert.eq(out.b , 1, 'B 2');
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assert.eq(out.c , undefined);
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out = t.findOne({}, {a:{$slice:3}, b:false});
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assert.eq(out.a , [0,1,2]);
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assert.eq(out.b , undefined);
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assert.eq(out.c , 1);
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t.drop()
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t.insert({comments: [{id:0, text:'a'},{id:1, text:'b'},{id:2, text:'c'},{id:3, text:'d'}], title:'foo'})
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out = t.findOne({}, {comments:{$slice:2}, 'comments.id':true});
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assert.eq(out.comments , [{id:0}, {id:1}]);
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assert.eq(out.title , undefined);
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out = t.findOne({}, {comments:{$slice:2}, 'comments.id':false});
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assert.eq(out.comments , [{text: 'a'}, {text: 'b'}]);
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assert.eq(out.title , 'foo');
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//nested arrays
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t.drop();
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t.insert({_id:1, a:[[1,1,1], [2,2,2], [3,3,3]], b:1, c:1});
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out = t.findOne({}, {a:{$slice:1}});
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assert.eq(out.a , [[1,1,1]], 'n 1');
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out = t.findOne({}, {a:{$slice:-1}});
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assert.eq(out.a , [[3,3,3]], 'n 2');
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out = t.findOne({}, {a:{$slice:[0,2]}});
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assert.eq(out.a , [[1,1,1],[2,2,2]], 'n 2');
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