esqueleto/test/new-join-compiler-errors/README.md
Ben Levy 56e4b83e5c
New syntax for Joins (Subquery + Union/Intersect/...) (#172)
* It works?

* Add multiple return values back in

* Allow order by alias

* Support groupBy and count, Returning value from a fromQuery now will make it into an alias

* Eliminate Alias type, TODO: finish implementing all the functions on Value for the alias constructors

* Add entity support to subqueries

* Cleanup duplication; Cleanup warnings and finish implementing all the cases for aliased values and entities.

* Cleanup fromQuery and add comments

* Modify EValueReference to support aliased entity fields instead of having to use opaque ERaw in field access

* Implement SQL Set Operations

* Add test to show novel use of fromQuery

* Cleanup unsafe case statements

* Add type annotations to helper queries to satisfy the typechecker on older GHC

* New syntax for joins, using placeholder names with ' in them to avoid name conflict with existing join types.
New api properly enforces Maybe on outer joins and requires an on clause for all joins in their construction.

* Add some more test queries using the new syntax

* Add test to verify that delete works with the new syntax

* Add cross join and implicit cross join using comma examples to test code for new from syntax

* Comment out use of CrossJoin in common tests since postgres cant handle it with the current implementation of the CrossJoin kind

* Add typeclass machinery to support the use of the old Join data types used in the existing from clause

* Fix bug with CrossJoin and add on_ syntax sugar

* move new from syntax into Database.Esqueleto.Experimental

* Merge subqueries and unions with the new join syntax, they all seem to play nicely together

* Cleanup somehow copies of ToAlias ended up staying in Internal and a swp file made it in to the branch.

* Fix compilation errors

* Swith tuple to using a TypeOperator

* Make operator only 2 characters

* added up to 8-tuple instances for ToMaybe, ToAlias, and ToAliasReference

* Add compiler error tests for new syntax to support making better errors

* Use closed data families to allow for catching missing on statements in joins.

* Convert ToAliasReferenceT to be a closed type family matching the other classes in the Experimental module

* added Esqueleto.Experimental documentation: added introduction and several examples of old vs. new syntax

* added more usage examples to module introduction; added documentation to SqlSetOperation, From, on, from, and (:&)

* Update (^.) to only treat natural keys with more than one component as ECompositeKey. Fixes #176.

* Update article metadata test to ensure the correct response was being returned instead of just check if an exception was thrown

* Add article metadata to cleanDB before deleting all articles to fix foreign key constraint errors

* Bump version number and add changelog entry

* Fix issue with ToMaybeT for Values, Maybe was going in the wrong place compared to the rest of the library. Add test to prove that Left joining into a subquery that returns a maybe flattens the maybe properly to avoid needing to call joinV.

* Fix common test for postgres, needed to add dogCounts to the group by since postgres is strict on only agregates for non grouped columns; I really need to set up a local postgresql

* Revert ToFromT changes. Only accept functions that return a SqlExpr (Value Bool) in ToFromT

* escaped use of '@' in TypeApplications in documentation

* Add more specific type signature to `on`

per parsonsmatt review suggestion. Improves type inference significantly.

Co-Authored-By: Matt Parsons <parsonsmatt@gmail.com>

Co-authored-by: charukiewicz <c.charukiewicz@gmail.com>
Co-authored-by: Matt Parsons <parsonsmatt@gmail.com>
2020-03-29 10:40:49 -06:00

7 lines
339 B
Markdown

# expected-compile-failures
This subdirectory contains a stack project for expected compilation failures. To
add a new "test case", create a new `executable` stanza in the `package.yaml`
file. The Travis CI test script ([`test.sh`](test.sh)) will attempt to compile
the executable and will exit with an error if it successfully compiled.