Repository: ariga/atlas
Pull request #218 (2021-11-13 13:57:50)

schema/schemaspec: bool attribute helpers
prep work for supporting slices of literals in schemaspec (currently only *Ref is supported). 


Patch:
diff --git a/cmd/atlas/schema.go b/cmd/atlas/schema.go
index d29f76ce..c3b8184a 100644
--- a/cmd/atlas/schema.go
+++ b/cmd/atlas/schema.go
@@ -1,4 +1,3 @@
-
 package main
 
 import (
@@ -9,7 +8,7 @@ import (
 var schemaCmd = &cobra.Command{
 	Use:   "schema",
 	Short: "Work with atlas schemas.",
-	Long: `Provides ability to interact with schema and data source.`,
+	Long:  `Provides ability to interact with schema and data source.`,
 }
 
 func init() {
diff --git a/internal/integration/go.mod b/internal/integration/go.mod
index 8a98d5d9..86ea9928 100644
--- a/internal/integration/go.mod
+++ b/internal/integration/go.mod
@@ -10,7 +10,7 @@ require (
 	github.com/go-sql-driver/mysql v1.6.0 // indirect
 	github.com/google/uuid v1.2.0
 	github.com/hashicorp/hcl/v2 v2.10.0 // indirect
-	github.com/lib/pq v1.10.2 // indirect
+	github.com/lib/pq v1.10.4 // indirect
 	github.com/stretchr/testify v1.7.0
 	github.com/zclconf/go-cty v1.10.0 // indirect
 )
diff --git a/internal/integration/go.sum b/internal/integration/go.sum
index e3aeaea3..c26f888d 100644
--- a/internal/integration/go.sum
+++ b/internal/integration/go.sum
@@ -82,15 +82,18 @@ github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDk
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@@ -247,6 +250,37 @@ github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:
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 go.etcd.io/etcd/api/v3 v3.5.0/go.mod h1:cbVKeC6lCfl7j/8jBhAK6aIYO9XOjdptoxU/nLQcPvs=
 go.etcd.io/etcd/client/pkg/v3 v3.5.0/go.mod h1:IJHfcCEKxYu1Os13ZdwCwIUTUVGYTSAM3YSwc9/Ac1g=
@@ -420,15 +473,18 @@ go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
 go.opencensus.io v0.23.0/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E=
+go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
 go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
+go.uber.org/zap v1.9.1/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
 go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
 go.uber.org/zap v1.17.0/go.mod h1:MXVU+bhUf/A7Xi2HNOnopQOrmycQ5Ih87HtOu4q5SSo=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190411191339-88737f569e3a/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE=
 golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
@@ -436,6 +492,9 @@ golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200128174031-69ecbb4d6d5d/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20201203163018-be400aefbc4c/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
+golang.org/x/crypto v0.0.0-20210616213533-5ff15b29337e/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@@ -491,6 +550,7 @@ golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190628185345-da137c7871d7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
@@ -543,8 +603,11 @@ golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181026203630-95b1ffbd15a5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -554,6 +617,7 @@ golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -587,6 +651,8 @@ golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -596,6 +662,7 @@ golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.5 h1:i6eZZ+zk0SOf0xgBpEpPD18qWcJda6q1sxt3S0kzyUQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -611,6 +678,7 @@ golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+golang.org/x/tools v0.0.0-20190425163242-31fd60d6bfdc/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190506145303-2d16b83fe98c/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190606124116-d0a3d012864b/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
@@ -618,6 +686,7 @@ golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgw
 golang.org/x/tools v0.0.0-20190624222133-a101b041ded4/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 golang.org/x/tools v0.0.0-20190628153133-6cdbf07be9d0/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 golang.org/x/tools v0.0.0-20190816200558-6889da9d5479/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20190823170909-c4a336ef6a2f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20190911174233-4f2ddba30aff/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191112195655-aa38f8e97acc/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
@@ -656,6 +725,8 @@ golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4f
 golang.org/x/tools v0.1.0 h1:po9/4sTYwZU9lPhi1tOrb4hCv3qrhiQ77LZfGa2OjwY=
 golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
 golang.org/x/tools v0.1.2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
+golang.org/x/xerrors v0.0.0-20190410155217-1f06c39b4373/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -772,6 +843,7 @@ gopkg.in/check.v1 v1.0.0-20141024133853-64131543e789/go.mod h1:Co6ibVJAznAaIkqp8
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/inconshreveable/log15.v2 v2.0.0-20180818164646-67afb5ed74ec/go.mod h1:aPpfJ7XW+gOuirDoZ8gHhLh3kZ1B08FtV2bbmy7Jv3s=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
diff --git a/schema/schemaspec/schemahcl/hcl.go b/schema/schemaspec/schemahcl/hcl.go
index 27968c01..d06495a9 100644
--- a/schema/schemaspec/schemahcl/hcl.go
+++ b/schema/schemaspec/schemahcl/hcl.go
@@ -238,11 +238,15 @@ func writeAttr(attr *schemaspec.Attr, body *hclwrite.Body) error {
 	case *schemaspec.ListValue:
 		lst := make([]string, 0, len(v.V))
 		for _, item := range v.V {
-			val, err := schemaspec.StrVal(item)
-			if err != nil {
-				return err
+			switch v := item.(type) {
+			case *schemaspec.Ref:
+				expr := strings.ReplaceAll(v.V, "$", "")
+				lst = append(lst, expr)
+			case *schemaspec.LiteralValue:
+				lst = append(lst, v.V)
+			default:
+				return fmt.Errorf("cannot write elem type %T of attr %q to HCL list", v, attr)
 			}
-			lst = append(lst, val)
 		}
 		body.SetAttributeRaw(attr.K, hclRawList(lst))
 	default:
diff --git a/schema/schemaspec/spec.go b/schema/schemaspec/spec.go
index 4daa0684..d8fc0abe 100644
--- a/schema/schemaspec/spec.go
+++ b/schema/schemaspec/spec.go
@@ -106,7 +106,7 @@ func (a *Attr) Ref() (string, error) {
 	return ref.V, nil
 }
 
-// Strings returns a slice of strings from the Value of the Attr. If The value is not a ListValue or the its
+// Strings returns a slice of strings from the Value of the Attr. If The value is not a ListValue or its
 // values cannot be converted to strings an error is returned.
 func (a *Attr) Strings() ([]string, error) {
 	lst, ok := a.V.(*ListValue)
@@ -117,13 +117,31 @@ func (a *Attr) Strings() ([]string, error) {
 	for _, item := range lst.V {
 		sv, err := StrVal(item)
 		if err != nil {
-			return nil, fmt.Errorf("schema: failed parsing item %q to string: %w", item, err)
+			return nil, fmt.Errorf("schemaspec: failed parsing item %q to string: %w", item, err)
 		}
 		out = append(out, sv)
 	}
 	return out, nil
 }
 
+// Bools returns a slice of bools from the Value of the Attr. If The value is not a ListValue or its
+// values cannot be converted to bools an error is returned.
+func (a *Attr) Bools() ([]bool, error) {
+	lst, ok := a.V.(*ListValue)
+	if !ok {
+		return nil, fmt.Errorf("schemaspec: attribute %q is not a list", a.K)
+	}
+	out := make([]bool, 0, len(lst.V))
+	for _, item := range lst.V {
+		b, err := BoolVal(item)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, b)
+	}
+	return out, nil
+}
+
 // Attr returns the Attr by the provided name and reports whether it was found.
 func (r *Resource) Attr(name string) (*Attr, bool) {
 	return attrVal(r.Attrs, name)
@@ -178,6 +196,21 @@ func StrVal(v Value) (string, error) {
 	return strconv.Unquote(lit.V)
 }
 
+// BoolVal returns the bool representation of v. If v is not a *LiteralValue
+// it returns an error. If the raw string representation of v cannot be read as
+// a bool, an error is returned as well.
+func BoolVal(v Value) (bool, error) {
+	lit, ok := v.(*LiteralValue)
+	if !ok {
+		return false, fmt.Errorf("schemaspec: expected %T to be LiteralValue", v)
+	}
+	b, err := strconv.ParseBool(lit.V)
+	if err != nil {
+		return false, fmt.Errorf("schemaspec: failed parsing %q as bool: %w", lit.V, err)
+	}
+	return b, nil
+}
+
 func (*LiteralValue) val() {}
 func (*ListValue) val()    {}
 func (*Ref) val()          {}
diff --git a/sql/internal/specutil/spec.go b/sql/internal/specutil/spec.go
index 28456378..717c0ec9 100644
--- a/sql/internal/specutil/spec.go
+++ b/sql/internal/specutil/spec.go
@@ -1,8 +1,6 @@
 package specutil
 
 import (
-	"strconv"
-
 	"ariga.io/atlas/schema/schemaspec"
 	"ariga.io/atlas/sql/sqlspec"
 )
@@ -26,17 +24,11 @@ func LitAttr(k, v string) *schemaspec.Attr {
 	}
 }
 
-// StrLitAttr is a helper method for constructing *schemaspec.Attr instances that contain literal values
-// representing string literals.
-func StrLitAttr(k, v string) *schemaspec.Attr {
-	return LitAttr(k, strconv.Quote(v))
-}
-
 // ListAttr is a helper method for constructing *schemaspec.Attr instances that contain list values.
-func ListAttr(k string, values ...string) *schemaspec.Attr {
+func ListAttr(k string, litValues ...string) *schemaspec.Attr {
 	lv := &schemaspec.ListValue{}
-	for _, v := range values {
-		lv.V = append(lv.V, &schemaspec.LiteralValue{V: strconv.Quote(v)})
+	for _, v := range litValues {
+		lv.V = append(lv.V, &schemaspec.LiteralValue{V: v})
 	}
 	return &schemaspec.Attr{
 		K: k,
diff --git a/sql/mysql/sqlspec.go b/sql/mysql/sqlspec.go
index 08d74548..9e486945 100644
--- a/sql/mysql/sqlspec.go
+++ b/sql/mysql/sqlspec.go
@@ -340,4 +340,4 @@ func enumSpec(t *schema.EnumType) (*sqlspec.Column, error) {
 		quoted = append(quoted, strconv.Quote(v))
 	}
 	return specutil.NewCol("", "enum", specutil.ListAttr("values", quoted...)), nil
-}
\ No newline at end of file
+}
diff --git a/sql/postgres/sqlspec.go b/sql/postgres/sqlspec.go
index e36c820e..a7c74d7f 100644
--- a/sql/postgres/sqlspec.go
+++ b/sql/postgres/sqlspec.go
@@ -327,4 +327,3 @@ func bitSpec(t *BitType) (*sqlspec.Column, error) {
 		return nil, errors.New("schema bit failed to convert")
 	}
 }
-


Test patch:
diff --git a/internal/integration/mysql_test.go b/internal/integration/mysql_test.go
index 196832dd..70593f59 100644
--- a/internal/integration/mysql_test.go
+++ b/internal/integration/mysql_test.go
@@ -59,8 +59,7 @@ func TestMySQL_AddDropTable(t *testing.T) {
 			&schema.AddTable{T: usersT},
 		})
 		require.NoError(t, err)
-		realm := t.loadRealm()
-		changes, err := t.drv.Diff().TableDiff(realm.Schemas[0].Tables[0], usersT)
+		changes, err := t.drv.Diff().TableDiff(t.loadUsers(), usersT)
 		require.NoError(t, err)
 		require.Empty(t, changes)
 		err = t.drv.Migrate().Exec(ctx, []schema.Change{
@@ -109,8 +108,7 @@ func TestMySQL_AddIndexedColumns(t *testing.T) {
 			Name:   "a_b_unique",
 			Parts:  []*schema.IndexPart{{C: usersT.Columns[1]}, {C: usersT.Columns[2]}},
 		})
-		realm := t.loadRealm()
-		changes, err := t.drv.Diff().TableDiff(realm.Schemas[0].Tables[0], usersT)
+		changes, err := t.drv.Diff().TableDiff(t.loadUsers(), usersT)
 		require.NoError(t, err)
 		require.NotEmpty(t, changes, "usersT contains 2 new columns and 1 new index")
 		err = t.drv.Migrate().Exec(ctx, []schema.Change{&schema.ModifyTable{T: usersT, Changes: changes}})
@@ -154,7 +152,7 @@ func TestMySQL_AddColumns(t *testing.T) {
 			&schema.Column{Name: "y", Type: &schema.ColumnType{Type: &schema.SpatialType{T: "point"}}},
 			&schema.Column{Name: "z", Type: &schema.ColumnType{Type: &schema.TimeType{T: "timestamp"}}, Default: &schema.RawExpr{X: "CURRENT_TIMESTAMP"}},
 		)
-		changes, err := t.drv.Diff().TableDiff(t.loadRealm().Schemas[0].Tables[0], usersT)
+		changes, err := t.drv.Diff().TableDiff(t.loadUsers(), usersT)
 		require.NoError(t, err)
 		require.Len(t, changes, 24)
 		err = t.drv.Migrate().Exec(ctx, []schema.Change{&schema.ModifyTable{T: usersT, Changes: changes}})
@@ -176,7 +174,7 @@ func TestMySQL_ColumnInt(t *testing.T) {
 			t.dropTables(usersT.Name)
 			for _, typ := range []string{"tinyint", "smallint", "mediumint", "bigint"} {
 				usersT.Columns[0].Type.Type = &schema.IntegerType{T: typ}
-				changes, err := t.drv.Diff().TableDiff(t.loadRealm().Schemas[0].Tables[0], usersT)
+				changes, err := t.drv.Diff().TableDiff(t.loadUsers(), usersT)
 				require.NoError(t, err)
 				require.Len(t, changes, 1)
 				err = t.drv.Migrate().Exec(ctx, []schema.Change{&schema.ModifyTable{T: usersT, Changes: changes}})
@@ -198,7 +196,7 @@ func TestMySQL_ColumnInt(t *testing.T) {
 			t.ensureNoChange(usersT)
 			for _, x := range []string{"2", "'3'", "10.1"} {
 				usersT.Columns[0].Default.(*schema.RawExpr).X = x
-				changes, err := t.drv.Diff().TableDiff(t.loadRealm().Schemas[0].Tables[0], usersT)
+				changes, err := t.drv.Diff().TableDiff(t.loadUsers(), usersT)
 				require.NoError(t, err)
 				require.Len(t, changes, 1)
 				err = t.drv.Migrate().Exec(ctx, []schema.Change{&schema.ModifyTable{T: usersT, Changes: changes}})
@@ -221,7 +219,7 @@ func TestMySQL_ColumnString(t *testing.T) {
 			t.dropTables(usersT.Name)
 			for _, typ := range []string{"varchar(255)", "char(120)", "tinytext", "mediumtext", "longtext"} {
 				usersT.Columns[0].Type.Type = &schema.StringType{T: typ}
-				changes, err := t.drv.Diff().TableDiff(t.loadRealm().Schemas[0].Tables[0], usersT)
+				changes, err := t.drv.Diff().TableDiff(t.loadUsers(), usersT)
 				require.NoError(t, err)
 				require.Len(t, changes, 1)
 				err = t.drv.Migrate().Exec(ctx, []schema.Change{&schema.ModifyTable{T: usersT, Changes: changes}})
@@ -259,7 +257,7 @@ func TestMySQL_ColumnString(t *testing.T) {
 			t.ensureNoChange(usersT)
 			for _, x := range []string{"2", "'3'", "'world'"} {
 				usersT.Columns[0].Default.(*schema.RawExpr).X = x
-				changes, err := t.drv.Diff().TableDiff(t.loadRealm().Schemas[0].Tables[0], usersT)
+				changes, err := t.drv.Diff().TableDiff(t.loadUsers(), usersT)
 				require.NoError(t, err)
 				require.Len(t, changes, 1)
 				err = t.drv.Migrate().Exec(ctx, []schema.Change{&schema.ModifyTable{T: usersT, Changes: changes}})
@@ -326,7 +324,7 @@ func TestMySQL_ColumnBool(t *testing.T) {
 			// Change default from "true" to "false" to "true".
 			for _, x := range []string{"false", "true"} {
 				usersT.Columns[0].Default.(*schema.RawExpr).X = x
-				changes, err := t.drv.Diff().TableDiff(t.loadRealm().Schemas[0].Tables[0], usersT)
+				changes, err := t.drv.Diff().TableDiff(t.loadUsers(), usersT)
 				require.NoError(t, err)
 				require.Len(t, changes, 1)
 				err = t.drv.Migrate().Exec(ctx, []schema.Change{&schema.ModifyTable{T: usersT, Changes: changes}})
@@ -348,7 +346,7 @@ func TestMySQL_ColumnBool(t *testing.T) {
 			t.dropTables(usersT.Name)
 			t.ensureNoChange(usersT)
 			usersT.Columns[0].Type.Null = false
-			changes, err := t.drv.Diff().TableDiff(t.loadRealm().Schemas[0].Tables[0], usersT)
+			changes, err := t.drv.Diff().TableDiff(t.loadUsers(), usersT)
 			require.NoError(t, err)
 			require.Len(t, changes, 1)
 			err = t.drv.Migrate().Exec(ctx, []schema.Change{&schema.ModifyTable{T: usersT, Changes: changes}})
@@ -357,6 +355,77 @@ func TestMySQL_ColumnBool(t *testing.T) {
 	})
 }
 
+func TestMySQL_ForeignKey(t *testing.T) {
+	ctx := context.Background()
+	t.Run("ChangeAction", func(t *testing.T) {
+		myRun(t, func(t *myTest) {
+			usersT, postsT := t.users(), t.posts()
+			t.dropTables(postsT.Name, usersT.Name)
+			err := t.drv.Migrate().Exec(ctx, []schema.Change{
+				&schema.AddTable{T: usersT},
+				&schema.AddTable{T: postsT},
+			})
+			require.NoError(t, err)
+			t.ensureNoChange(postsT, usersT)
+
+			postsT = t.loadPosts()
+			fk, ok := postsT.ForeignKey("author_id")
+			require.True(t, ok)
+			fk.OnUpdate = schema.SetNull
+			fk.OnDelete = schema.Cascade
+			changes, err := t.drv.Diff().TableDiff(t.loadPosts(), postsT)
+			require.NoError(t, err)
+			require.Len(t, changes, 1)
+			modifyF, ok := changes[0].(*schema.ModifyForeignKey)
+			require.True(t, ok)
+			require.True(t, modifyF.Change == schema.ChangeUpdateAction|schema.ChangeDeleteAction)
+
+			err = t.drv.Migrate().Exec(ctx, []schema.Change{&schema.ModifyTable{T: postsT, Changes: changes}})
+			require.NoError(t, err)
+			t.ensureNoChange(postsT, usersT)
+		})
+	})
+
+	t.Run("UnsetNull", func(t *testing.T) {
+		myRun(t, func(t *myTest) {
+			usersT, postsT := t.users(), t.posts()
+			t.dropTables(postsT.Name, usersT.Name)
+			fk, ok := postsT.ForeignKey("author_id")
+			require.True(t, ok)
+			fk.OnDelete = schema.SetNull
+			fk.OnUpdate = schema.SetNull
+			err := t.drv.Migrate().Exec(ctx, []schema.Change{
+				&schema.AddTable{T: usersT},
+				&schema.AddTable{T: postsT},
+			})
+			require.NoError(t, err)
+			t.ensureNoChange(postsT, usersT)
+
+			postsT = t.loadPosts()
+			c, ok := postsT.Column("author_id")
+			require.True(t, ok)
+			c.Type.Null = false
+			fk, ok = postsT.ForeignKey("author_id")
+			require.True(t, ok)
+			fk.OnUpdate = schema.NoAction
+			fk.OnDelete = schema.NoAction
+			changes, err := t.drv.Diff().TableDiff(t.loadPosts(), postsT)
+			require.NoError(t, err)
+			require.Len(t, changes, 2)
+			modifyC, ok := changes[0].(*schema.ModifyColumn)
+			require.True(t, ok)
+			require.True(t, modifyC.Change == schema.ChangeNull)
+			modifyF, ok := changes[1].(*schema.ModifyForeignKey)
+			require.True(t, ok)
+			require.True(t, modifyF.Change == schema.ChangeUpdateAction|schema.ChangeDeleteAction)
+
+			err = t.drv.Migrate().Exec(ctx, []schema.Change{&schema.ModifyTable{T: postsT, Changes: changes}})
+			require.NoError(t, err)
+			t.ensureNoChange(postsT, usersT)
+		})
+	})
+}
+
 func TestMySQL_HCL(t *testing.T) {
 	myRun(t, func(t *myTest) {
 		t.applyHcl(`
@@ -369,12 +438,11 @@ table "users" {
 	}
 }
 `)
-		realm := t.loadRealm()
-		table, ok := realm.Schemas[0].Table("users")
-		require.True(t, ok, "expected users table")
-		column, ok := table.Column("email")
+		users := t.loadUsers()
+		t.dropTables(users.Name)
+		column, ok := users.Column("email")
 		require.True(t, ok, "expected name column")
-		require.Equal(t, "users", table.Name)
+		require.Equal(t, "users", users.Name)
 		require.Equal(t, "email", column.Name)
 		require.Equal(t, column.Type.Raw, "varchar(255)")
 		t.applyHcl(`
@@ -499,6 +567,22 @@ func (t *myTest) loadRealm() *schema.Realm {
 	return r
 }
 
+func (t *myTest) loadUsers() *schema.Table {
+	realm := t.loadRealm()
+	require.Len(t, realm.Schemas, 1)
+	users, ok := realm.Schemas[0].Table("users")
+	require.True(t, ok)
+	return users
+}
+
+func (t *myTest) loadPosts() *schema.Table {
+	realm := t.loadRealm()
+	require.Len(t, realm.Schemas, 1)
+	users, ok := realm.Schemas[0].Table("posts")
+	require.True(t, ok)
+	return users
+}
+
 // defaultConfig returns the default charset and
 // collation configuration based on the MySQL version.
 func (t *myTest) defaultAttrs() []schema.Attr {
diff --git a/schema/schemaspec/schemahcl/context_test.go b/schema/schemaspec/schemahcl/context_test.go
index b3f088fe..51a93fff 100644
--- a/schema/schemaspec/schemahcl/context_test.go
+++ b/schema/schemaspec/schemahcl/context_test.go
@@ -238,6 +238,8 @@ group "lion_kings" {
 			{V: "$user.mufasa"},
 		},
 	}, test.Groups[0])
+	_, err = Marshal(&test)
+	require.NoError(t, err)
 }
 
 func TestNestedDifference(t *testing.T) {
diff --git a/schema/schemaspec/spec_test.go b/schema/schemaspec/spec_test.go
new file mode 100644
index 00000000..8022d6fb
--- /dev/null
+++ b/schema/schemaspec/spec_test.go
@@ -0,0 +1,29 @@
+package schemaspec
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestBoolVal(t *testing.T) {
+	b, err := BoolVal(&LiteralValue{V: "true"})
+	require.NoError(t, err)
+	require.True(t, b)
+}
+
+func TestBools(t *testing.T) {
+	a := Attr{
+		K: "b",
+		V: &ListValue{
+			V: []Value{
+				&LiteralValue{V: "true"},
+				&LiteralValue{V: "false"},
+				&LiteralValue{V: "true"},
+			},
+		},
+	}
+	bls, err := a.Bools()
+	require.NoError(t, err)
+	require.EqualValues(t, []bool{true, false, true}, bls)
+}
diff --git a/sql/mysql/sqlspec_test.go b/sql/mysql/sqlspec_test.go
index 0c7b1e0c..d23141fc 100644
--- a/sql/mysql/sqlspec_test.go
+++ b/sql/mysql/sqlspec_test.go
@@ -399,7 +399,7 @@ func TestMarshalSpecColumnType(t *testing.T) {
 		},
 		{
 			schem:    &schema.EnumType{Values: []string{"a", "b", "c"}},
-			expected: specutil.NewCol("column", "enum", specutil.ListAttr("values", `a`, `b`, `c`)),
+			expected: specutil.NewCol("column", "enum", specutil.ListAttr("values", `"a"`, `"b"`, `"c"`)),
 		},
 		{
 			schem:    &schema.BoolType{T: "boolean"},
diff --git a/sql/postgres/sqlspec_test.go b/sql/postgres/sqlspec_test.go
index 1948bd11..f6db34a0 100644
--- a/sql/postgres/sqlspec_test.go
+++ b/sql/postgres/sqlspec_test.go
@@ -340,7 +340,7 @@ func TestMarshalSpecColumnType(t *testing.T) {
 				Values: []string{"a", "b", "c"},
 			},
 			expected: specutil.NewCol("enum", "enum",
-				specutil.ListAttr("values", "a", "b", "c")),
+				specutil.ListAttr("values", `"a"`, `"b"`, `"c"`)),
 		},
 		{
 			schem: &schema.BoolType{
@@ -376,7 +376,7 @@ func TestMarshalSpecColumnType(t *testing.T) {
 		},
 		{
 			schem: &BitType{
-				T: tBit,
+				T:   tBit,
 				Len: 1,
 			},
 			expected: specutil.NewCol("bit", "bit"),
@@ -389,14 +389,14 @@ func TestMarshalSpecColumnType(t *testing.T) {
 		},
 		{
 			schem: &BitType{
-				T: tBit,
+				T:   tBit,
 				Len: 8,
 			},
 			expected: specutil.NewCol("bit8", "bit(8)"),
 		},
 		{
 			schem: &BitType{
-				T: tBitVar,
+				T:   tBitVar,
 				Len: 8,
 			},
 			expected: specutil.NewCol("bitvar8", "bit varying(8)"),
diff --git a/sql/sqlite/sqlspec_test.go b/sql/sqlite/sqlspec_test.go
index 95ce5e52..a8a07ac2 100644
--- a/sql/sqlite/sqlspec_test.go
+++ b/sql/sqlite/sqlspec_test.go
@@ -316,7 +316,7 @@ func TestMarshalSpecColumnType(t *testing.T) {
 		},
 		{
 			schem:    &schema.EnumType{T: "enum", Values: []string{"a", "b", "c"}},
-			expected: specutil.NewCol("column", "enum", specutil.ListAttr("values", "a", "b", "c")),
+			expected: specutil.NewCol("column", "enum", specutil.ListAttr("values", `"a"`, `"b"`, `"c"`)),
 		},
 		{
 			schem:    &schema.BoolType{T: "boolean"},