FET
Build query dynamically
A
Go library for building mongo queries with factory functions.
What is FET?
you can build queries with factory functions. It can make your repository functions more generic, and makes checking query variables easier with the built-in checker system.
Installation
go get github.com/ahmetcanozcan/fet
Getting Started
basic usage of the fet is building a query factory functions, and then this query can be used in mongo driver functions.
filter := fet.Build(
fet.Field("username").Eq("test"),
)
err := collection.FindOne(ctx, filter)
instead of using Field, you can use with functions directly.
filter := fet.Build(
fet.WithValueEq("userName", "test"),
)
// is equivalent of:
// filter := bson.M{
// "userName": "test",
// }
err := collection.FindOne(ctx, filter)
Features
Generic Repository Functions
func (repo *repository) GetByFilters(ctx context.Context, filters ...[]fet.Updater) (*User, error) {
// ...
filter := fet.Build(filters...)
err := collection.FindOne(ctx, filter).Decode(&user)
// ...
return user, err
}
// This function can be called
user, err := repo.GetByFilters(
ctx,
fet.WithValueEq("username", "test"),
fet.WithValueEq("password", "test"),
)
user, err := repo.GetByFilters(
ctx,
fet.Field("username").Eq("test"),
fet.Field("password").Eq("test"),
fet.Or(
fet.Field("pretty").Eq(true),
fet.Field("admin").Eq(true),
)
)
Checker
checker is basic function that returns true depends on field name and query variable. FET has some built-in checker functions such as IfNotNil, IfNotEmpty, IfNotZeroTime.
filter := fet.Build(
fet.Field("username").Eq(username),
fet.Field("cardId").Eq(cardId, fet.IfNotEmpty),
)
// filter is change depends on cardId
// if cardId is empty, filter is equivalent of:
filter := bson.M{
"username": username,
}
// if cardId is not empty, filter is equivalent of:
filter := bson.M{
"username": username,
"cardId": cardId,
}
Contributing
Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
Please make sure to update tests as appropriate.
