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 },

] });

Keys with operators like this will cause TypeScript errors as there is no way to support them on the typings side. They are still supported, but you will need to cast the condition to any to use them.

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]);

List of supported operators

Comparison

operator	name	description
$eq	equals	Matches values that are equal to a specified value.
$gt	greater	Matches values that are greater than a specified value.
$gte	greater or equal	Matches values that are greater than or equal to a specified value.
$in	contains	Matches any of the values specified in an array.
$lt	lower	Matches values that are less than a specified value.
$lte	lower or equal	Matches values that are less than or equal to a specified value.
$ne	not equal	Matches all values that are not equal to a specified value.
$nin	not contains	Matches none of the values specified in an array.
$like	like	Uses LIKE operator
$re	regexp	Uses REGEXP operator

Logical

operator	description
$and	Joins query clauses with a logical AND returns all documents that match the conditions of both clauses.
$not	Inverts the effect of a query expression and returns documents that do not match the query expression.
$or	Joins query clauses with a logical OR returns all documents that match the conditions of either clause.