How to Construct Nested OR/AND Query Filters in the mongo-go-driver?

Nested OR/AND Query Filter in mongo-go-driver

In MongoDB, complex query filters can involve nested logical operators such as OR and AND. The mongo-go-driver allows you to construct these filters programmatically.

When using nested logical operators, it's essential to understand the structure required by the driver. For example, the $or operator requires an array of conditions, represented as bson.A. The $and operator, on the other hand, is the default and does not explicitly need to be specified.

Consider the following example where you want to create a filter with an OR condition nested within an AND condition:

filter := bson.M{
    "p": 10,
    "$and": bson.D{{"s", 30}, bson.M{"$or": bson.D{{"a", 1}}}}}
}

This code results in an error because it tries to mix bson.M with bson.D within an AND condition. To fix this, you need to use bson.A for the $or condition and remove the unnecessary $and operator:

filter := bson.D{
    {"p", 10},
    {"$or", bson.A{
        bson.D{{"s", 30}},
        bson.D{{"a", 1}},
    }},
}

Alternatively, you can use the following simplified syntax:

filter := bson.M{
    "p": 10,
    "$or": bson.A{
        bson.M{"s": 30},
        bson.M{"a": 10},
    },
}

This syntax creates the same query filter as the previous examples. The choice of syntax depends on your preference and the complexity of your query.

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