Slick 3.1.0-M2

We are happy to announce the release of Slick 3.1.0-M2. It should show up on Maven Central within the next few hours. You can find the source code here: https://github.com/slick/slick/tree/3.1.0-M2. Builds are available for Scala 2.10 and 2.11.

These are the major new features since 3.0:

• New query compiler back-end. The main goal is to avoid subqueries wherever possible. The current version is feature-complete.
• Improved support for monadic joins in the query compiler. In particular, whenever a monadic join cannot be translated into an applicative join (as required for SQL), the query compiler will fail with a useful error message instead of producing invalid code.
• Improved configuration of database connections via Typesafe Config: You can now configure arbitrary DataSource classes with Java Bean semantics when running without a connection pool (similar to what was already supported by HikariCP).
• Configurable class loading when resolving Slick drivers: In containers which separate parts of an application into different ClassLoaders (e.g. Play, OSGi), the previous approach of using Class.forName did not work in all cases. You can now provide a custom ClassLoader, and Slick will fall back to the context ClassLoader in other cases.
• Support for HikariCP is now in a separate module which makes it easier to depend on the correct, binary compatible version of HikariCP.
• Database connections can be configured through a DATABASE_URL syntax as used on PaaS platforms like Heroku.

Note that this is not a production-ready or beta release. Parts of the user manual may be out of date. Slick Extensions is not available for this release and none of the standard Activator templates have been updated yet.

Please provide feedback on the stability and API of this milestone release if you encounter any problems.

Here is a complete list of changes since 3.0.0

• 17c47e5 Release 3.1.0-M2
• 16be008 Fix docs and simplify (no binary compatibility constraints for 3.1)
• c197fdb Move HikariCPJdbcDataSource into a separate module
• b651a62 Clean up the build file
• 764b405 Avoid subqueries around zipWithIndex operations
• 7514666 Database.forConfig uses provided config params numThreads and queueSize
• 5ca0e5c Add tests for the removeTakeDrop phase:
• a30d5df Fixed a mistake in the docs markup
• e957544 Fix the implicit conversions for Compiled queries.
• ea15636 Workaround SI-7139 caused by eponymous type alias and object
• c762b55 Improve code generation
• aaf2a22 Early hoisting of client-side operations:
• ffee22c Improve subquery fusion for Union operations
• fbd2289 Add the correct scala-sbt repo for resolving sbt-testng.plugin
• 31672a2 Remove deprecated APIs
• 2ae5320 Added documentation for DatabaseUrlDataSource
• 7fcd722 Add a test for DatabaseUrlDataSource
• f637d52 Revised DatabaseUrlDataSource to have a no-arg cstr.
• 9cfd03e Added a DatabaseUrlDataSource for use with DATABASE_URL
• 79d2e67 Support Typesafe Config-based configuration of DataSource beans
• 4565f09 Clean up the ClassLoader support from #1152:
• 95dad0a Set hikariCP validationTimeout from config or 1000ms
• 9b58a50 Pin HikariCP at version 2.3.7 to match play-slick
• 5ef94f8 Remove AccessDriver
• cce3b95 Remove the Direct Embedding (deprecated in 3.0)
• 4b7262e Add test for resolving reference.conf in OSGi context
• a9dd9a8 Fix OSGi tests (did not run due to duplicate slf4j on classpath)
• ff264c9 Bump version numbers
• b9861f1 Remove obsolete code
• 36d5552 Improve Take, Drop and zip join translation
• f170783 Fix type bugs and enforce correct types in the query compiler:
• 85df538 Codegen: Suppress output of schema.create if ddlEnabled is false
• 4fd654f Add Gitter badge
• e26a7d0 Remove TypedNode:
• 1c2d5db AST simplifications
• 3470fa0 Compiler improvements:
• 8baa079 New Query Compiler Back-End
• 2b14139 Early transformation of monadic joins into applicative joins.
• f53f06e Move createResultSetMapping down after forceOuterBinds
• 1d55c69 Fix view source for scaladoc and edit this file on github for docs
• 325f200 Improve tree logging
• ae7e4d8 Improve logging:
• 1abf753 Allow classloader to be specified for classloading
• 0cab15e Add docs about DBIO composition.