13 KiB
Changes between 1.0.0-beta7 and 1.0.0-beta8
MongoDB 2.1/2.2 Aggregation Framework support
monger.collection/aggregate provides a convenient way to run aggregation queries.
(ns my.service
(:require [monger.collection :as mc])
(:use monger.operators))
;; single stage pipeline
(mc/aggregate "docs" [{$project {:subtotal {$multiply ["$quantity", "$price"]}
:_id "$state"}}])
;; two stage pipeline
(mc/aggregate "docs" [{$project {:subtotal {$multiply ["$quantity", "$price"]}
:_id 1
:state 1}}
{$group {:_id "$state"
:total {$sum "$subtotal"}}}])
The following couple of tests demonstrates aggregation queries with some sample data:
(deftest ^{:edge-features true} test-basic-projection-with-multiplication
(let [collection "docs"
batch [{ :state "CA" :quantity 1 :price 199.00 }
{ :state "NY" :quantity 2 :price 199.00 }
{ :state "NY" :quantity 1 :price 299.00 }
{ :state "IL" :quantity 2 :price 11.50 }
{ :state "CA" :quantity 2 :price 2.95 }
{ :state "IL" :quantity 3 :price 5.50 }]
expected [{:_id "NY" :subtotal 398.0}
{:_id "NY" :subtotal 299.0}
{:_id "IL" :subtotal 23.0}
{:_id "CA" :subtotal 5.9}
{:_id "IL" :subtotal 16.5}
{:_id "CA" :subtotal 199.0}]]
(mc/insert-batch collection batch)
(let [result (vec (mc/aggregate "docs" [{$project {:subtotal {$multiply ["$quantity", "$price"]}
:_id "$state"}}]))]
(is (= expected result)))))
(deftest ^{:edge-features true} test-basic-total-aggregation
(let [collection "docs"
batch [{ :state "CA" :quantity 1 :price 199.00 }
{ :state "NY" :quantity 2 :price 199.00 }
{ :state "NY" :quantity 1 :price 299.00 }
{ :state "IL" :quantity 2 :price 11.50 }
{ :state "CA" :quantity 2 :price 2.95 }
{ :state "IL" :quantity 3 :price 5.50 }]
expected [{:_id "CA", :total 204.9} {:_id "IL", :total 39.5} {:_id "NY", :total 697.0}]]
(mc/insert-batch collection batch)
(let [result (vec (mc/aggregate "docs" [{$project {:subtotal {$multiply ["$quantity", "$price"]}
:_id 1
:state 1}}
{$group {:_id "$state"
:total {$sum "$subtotal"}}}]))]
(is (= expected result)))))
The aggregation framework is an edge feature that will be available in MongoDB 2.2.
More Operators
Two new operator macros: $regex, $options and those used by the upcoming
MongoDB 2.2 Aggregation framework.
Changes between 1.0.0-beta6 and 1.0.0-beta7
Replica sets support
Monger can now connect to replica sets using one or more seeds when
calling monger.core/connect with a collection of server addresses
instead of just a single one:
(ns my.service
(:use monger.core))
;; Connect to a single MongoDB instance
(connect (server-address "127.0.0.1" 27017) (mongo-options))
;; Connect to a replica set
(connect [(server-address "127.0.0.1" 27017) (server-address "127.0.0.1" 27018)]
(mongo-options))
monger.core/connect! works exactly the same way.
Contributed by Baishampayan Ghose.
ring.session.store implementation
Monger now features a Ring session store implementation. To use it, require monger.ring.session-store and use
monger.ring.session-store/monger-store function like so:
(ns my.service
(:use monger.ring.session-store))
(let [store (monger-store "web_sessions")]
...)
Changes between 1.0.0-beta5 and 1.0.0-beta6
find-and-modify support
monger.collection/find-and-modify function implements atomic Find and Modify command.
It is similar to the "regular" update operations but atomically modifies a document (at most one) and returns it.
An example:
(mgcol/find-and-modify "scoreboard" {:name "Sophie Bangs"} {$inc {:level 1}} :return-new true)
Contributed by Baishampayan Ghose.
monger.js is deprecated
monger.js namespace is kept for backwards compatibility but is deprecated in favor of ClojureWerkz Support
that now has exactly the same function in clojurewerkz.support.js. To add Support to your project with Leiningen, use
[clojurewerkz/support "0.3.0"]
Validateur 1.1.0
Validateur dependency has been upgraded to 1.1.0.
Changes between 1.0.0-beta4 and 1.0.0-beta5
More Operators
Several new operator macros: $size, $exists, $mod, $type, $not.
Clojure sets now can be serialized
Monger now supports serialization for all classes that implement java.util.Set, including Clojure sets.
Capped collection support
monger.collection/create provides a way to create collections with fine-tuned attributes (for example, capped collections)
without having to use Java driver API.
clojure.core.cache integration
monger.cache is a new namespace for various cache implementations that adhere to the clojure.core.cache CacheProtocol protocol
and sit on top of MongoDB
Clojure symbols now can be serialized
Monger now supports serialization for all classes that implement clojure.lang.Named, not just keywords.
Improved serialization performance
Thanks to faster paths for serialization of strings and dates (java.util.Date), mean time to insert 100,000 documents went down from about 1.7 seconds to about 0.5 seconds.
Changes between 1.0.0-beta3 and 1.0.0-beta4
Support for URI connections (and thus PaaS provides like Heroku)
monger.core/connect-via-uri! is a new function that combines monger.core/connect!, monger.core/set-db! and monger.core/authenticate
and works with string URIs like mongodb://userb71148a:0da0a696f23a4ce1ecf6d11382633eb2049d728e@cluster1.mongohost.com:27034/app81766662.
It can be used to connect with or without authentication, for example:
;; connect without authentication
(monger.core/connect-via-uri! "mongodb://127.0.0.1/monger-test4")
;; connect with authentication
(monger.core/connect-via-uri! "mongodb://clojurewerkz/monger!:monger!@127.0.0.1/monger-test4")
;; connect using connection URI stored in an env variable, in this case, MONGOHQ_URL
(monger.core/connect-via-uri! (System/genenv "MONGOHQ_URL"))
It is also possible to pass connection options as query parameters:
(monger.core/connect-via-uri! "mongodb://localhost/test?maxPoolSize=128&waitQueueMultiple=5;waitQueueTimeoutMS=150;socketTimeoutMS=5500&autoConnectRetry=true;safe=false&w=1;wtimeout=2500;fsync=true")
Changes between 1.0.0-beta2 and 1.0.0-beta3
Support for field negation in queries
Previously to load only a subset of document fields with Monger, one had to specify them all. Starting with 1.0.0-beta3, Monger supports field negation feature of MongoDB: it is possible to exclude certain fields instead.
To do so, pass a map as field selector, with fields that should be omitted set to 0:
;; will retrieve all fields except body
(monger.collection/find-one-map "documents" {:author "John"} {:body 0})
Validateur 1.1.0-beta1
Validateur dependency has been upgraded to 1.1.0-beta1.
Index Options support for monger.collection/ensure-index and /create-index
monger.collection/ensure-index and /create-index now accept index options as additional argument.
Breaking change: 3-arity versions of those functions now become 4-arity versions.
Support serialization of Clojure ratios
Documents that contain Clojure ratios (for example, 26/5) now can be converted to DBObject instances
and thus stored. On load, ratios will be presented as doubles: this way we ensure interoperability with
other languages and clients.
Factories/fixtures DSL
When working with even moderately complex data sets, fixture data quickly becomes difficult to maintain. Monger 1.0.0-beta3 introduce a new factories DSL that is inspired by (but does not try to copy) Ruby's Factory Girl and similar libraries.
It includes support dynamically evaluated attributes and support for two most common techniques for implementing associations between documents.
Here is what it feels like:
(defaults-for "domains"
:ipv6-enabled false)
(factory "domains" "clojure"
:name "clojure.org"
:created-at (-> 2 days ago)
:embedded [(embedded-doc "pages" "http://clojure.org/lisp")
(embedded-doc "pages" "http://clojure.org/jvm_hosted")
(embedded-doc "pages" "http://clojure.org/runtime_polymorphism")])
(factory "domains" "elixir"
:name "elixir-lang.org"
:created-at (fn [] (now))
:topics (fn [] ["programming" "erlang" "beam" "ruby"])
:related {
:terms (fn [] ["erlang" "python" "ruby"])
})
(factory "pages" "http://clojure.org/rationale"
:name "/rationale"
:domain-id (parent-id "domains" "clojure"))
(factory "pages" "http://clojure.org/jvm_hosted"
:name "/jvm_hosted")
(factory "pages" "http://clojure.org/runtime_polymorphism"
:name "/runtime_polymorphism")
(factory "pages" "http://clojure.org/lisp"
:name "/lisp")
(build "domains" "clojure" :created-at (-> 2 weeks ago))
(seed "pages" "http://clojure.org/rationale")
Leiningen 2
Monger now uses Leiningen 2.
monger.core/set-connection!
monger.core/set-connection! allows you to instantiate connection object (com.mongodb.Mongo instances) any way you like and then use it as default Monger connection. MongoDB Java driver provides many ways to instantiate and fine tune connections, this is the easiest way for Monger to support them all.
2-arity for monger.core/connect and monger.core/connect!
monger.core/connect now has 2-arity that accepts com.mongodb.ServerAddresss and com.mongodb.MongoOptions
instances and allows you fine tune parameters like socket and connection timeouts, default :w value, connection threads
settings and so on.
monger.core/mongo-options and monger.core/server-address are helper functions that instantiate those classes from
paramters passed as Clojure maps, for convenience.
Changes between 1.0.0-beta1 and 1.0.0-beta2
3-arity of monger.collection/find-one-as-map now takes a vector of fields
3-arity of monger.collection/find-one-as-map now takes a vector of fields
instead of keywordize to better fit a more commonly needed case.
;; 3-arity in 1.0.0-beta1
(monger.collection/find-one-as-map "documents" { :first_name "John" } false)
;; 3-arity in 1.0.0-beta2
(monger.collection/find-one-as-map "documents" { :first_name "John" } [:first_name, :last_name, :age])
If you need to use keywordize, use 4-arity:
(monger.collection/find-one-as-map "documents" { :first_name "John" } [:first_name, :last_name, :age] false)
Query DSL has a way to specify if fields need to be keywordized
It is now possible to opt-out of field keywordization in the query DSL:
(with-collection coll
(find {})
(limit 3)
(sort { :population -1 })
(keywordize-fields false))
the default value is still true, field names will be converted to keywords.
monger.collection/find-by-id and /find-map-by-id fail fast when id is nil
monger.collection/find-by-id and /find-map-by-id now will throw IllegalArgumentException when id is nil
monger.collection/find-map-by-id no longer ignore fields argument
monger.collection/find-map-by-id no longer ignore fields argument. Contributed by Toby Hede.
Meet monger.db and monger.command
monger.db namespace was added to perform operations like adding users or dropping databases. Several functions from
monger.core will eventually be moved there, but not for 1.0.
monger.command namespace includes convenience methods for issuing MongoDB commands.
Both are contributed by Toby Hede.
New convenience functions: monger.collection/update-by-id, /remove-by-id
monger.collection/update-by-id is a new convenience function for updating a single document with
given ObjectId. monger.collection/remove-by-id is its counterpart for removing documents.
monger.core/get-db-names
monger.core/get-db-names returns a set of databases. Contributed by Toby Hede.