better deferrable handling

pyproject.toml

@@ -14,7 +14,7 @@ python = "*"
 sqlbag = "*"
 six = "*"
 # schemainspect = {path="../schemainspect"}
-schemainspect = ">=0.1.1603009162"
+schemainspect = ">=0.1.1610498640"
 psycopg2-binary = { version="*", optional = true }
 
 [tool.poetry.dev-dependencies]

tests/FIXTURES/constraints/a.sql

@@ -0,0 +1,9 @@
+create table t1(a int);
+
+create table b(bb int primary key);
+
+create table t2(a int primary key, bb int references b(bb), price numeric, constraint x check (price > 0));
+
+create table c(cc int unique);
+
+create unique index on t1(a);

tests/FIXTURES/constraints/b.sql

@@ -0,0 +1,13 @@
+create table b(bb int primary key);
+
+create table t2(a int, bb int references b(bb) DEFERRABLE INITIALLY deferred);
+
+create table t1(a int primary key, price numeric, constraint x check (price > 0));
+
+create table c(cc int unique);
+
+CREATE UNIQUE INDEX c_pkey ON public.c USING btree (cc);
+
+alter table "public"."c" add constraint "c_pkey" PRIMARY KEY using index "c_pkey" deferrable INITIALLY deferred;
+
+create unique index on t2(a);

tests/FIXTURES/constraints/expected.sql

@@ -0,0 +1,33 @@
+alter table "public"."t2" drop constraint "x";
+
+alter table "public"."t2" drop constraint "t2_bb_fkey";
+
+alter table "public"."t2" drop constraint "t2_pkey";
+
+drop index if exists "public"."t1_a_idx";
+
+drop index if exists "public"."t2_pkey";
+
+alter table "public"."c" alter column "cc" set not null;
+
+alter table "public"."t1" add column "price" numeric;
+
+alter table "public"."t1" alter column "a" set not null;
+
+alter table "public"."t2" drop column "price";
+
+alter table "public"."t2" alter column "a" drop not null;
+
+CREATE UNIQUE INDEX c_pkey ON public.c USING btree (cc);
+
+CREATE UNIQUE INDEX t1_pkey ON public.t1 USING btree (a);
+
+CREATE UNIQUE INDEX t2_a_idx ON public.t2 USING btree (a);
+
+alter table "public"."c" add constraint "c_pkey" PRIMARY KEY using index "c_pkey" DEFERRABLE INITIALLY DEFERRED;
+
+alter table "public"."t1" add constraint "t1_pkey" PRIMARY KEY using index "t1_pkey";
+
+alter table "public"."t1" add constraint "x" CHECK ((price > (0)::numeric));
+
+alter table "public"."t2" add constraint "t2_bb_fkey" FOREIGN KEY (bb) REFERENCES b(bb) DEFERRABLE INITIALLY DEFERRED;

tests/test_migra.py

@@ -78,6 +78,7 @@ dependencies
 dependencies2
 dependencies3
 dependencies4
+constraints
 """.split()
 
 # fixtures = [(_, ) for _ in fixtures]