Smart Query Conditions

When you want to make complex queries, you can easily end up with a lot of boilerplate code full of curly brackets:

const res = await orm.em.find(Author, { $and: [
{ id: { $in: [1, 2, 7] }, },
{ id: { $nin: [3, 4] }, },
{ id: { $gt: 5 }, },
{ id: { $lt: 10 }, },
{ id: { $gte: 7 }, },
{ id: { $lte: 8 }, },
{ id: { $ne: 9 }, },
] });

For AND condition with single field, you can also do this:

const res = await orm.em.find(Author, {
id: {
$in: [1, 2, 7],
$nin: [3, 4],
$gt: 5,
$lt: 10,
$gte: 7,
$lte: 8,
$ne: 9,
},
});

Another way to do this by including the operator in your keys:

const res = await orm.em.find(Author, { $and: [
{ 'id:in': [1, 2, 7] },
{ 'id:nin': [3, 4] },
{ 'id:gt': 5 },
{ 'id:lt': 10 },
{ 'id:gte': 7 },
{ 'id:lte': 8 },
{ 'id:ne': 9 },
] });

For comparison operators, you can also use their mathematical symbols:

const res = await orm.em.find(Author, { $and: [
{ 'id >': 5 },
{ 'id <': 10 },
{ 'id >=': 7 },
{ 'id <=': 8 },
{ 'id !=': 9 },
] });

There is also shortcut for $in - simply provide array as value and it will be converted automatically:

const res = await orm.em.find(Author, { favouriteBook: [1, 2, 7] });

For primary key lookup, you can provide the array directly to em.find():

const res = await orm.em.find(Author, [1, 2, 7]);