refactor: use multiline string templates to preserve escapes in checks

lib/migration_generator/operation.ex

@@ -1351,10 +1351,20 @@ defmodule AshPostgres.MigrationGenerator.Operation do
           },
           table: table
         }) do
+      prefix = if schema, do: ", " <> option(:prefix, schema), else: ""
+
       if base_filter do
-        "create constraint(:#{as_atom(table)}, :#{as_atom(name)}, #{join(["check: \"(#{check}) OR NOT (#{base_filter})\")", option(:prefix, schema)])}"
+        ~s'''
+        create constraint(:#{as_atom(table)}, :#{as_atom(name)}, check: """
+          (#{check}) OR NOT (#{base_filter})
+        """#{prefix})
+        '''
       else
-        "create constraint(:#{as_atom(table)}, :#{as_atom(name)}, #{join(["check: \"#{check}\")", option(:prefix, schema)])}"
+        ~s'''
+        create constraint(:#{as_atom(table)}, :#{as_atom(name)}, check: """
+          #{check}
+        """#{prefix})
+        '''
       end
     end
 
@@ -1386,10 +1396,20 @@ defmodule AshPostgres.MigrationGenerator.Operation do
           schema: schema,
           table: table
         }) do
+      prefix = if schema, do: ", " <> option(:prefix, schema), else: ""
+
       if base_filter do
-        "create constraint(:#{as_atom(table)}, :#{as_atom(name)}, #{join(["check: \"#{base_filter} AND #{check}\")", option(:prefix, schema)])}"
+        ~s'''
+        create constraint(:#{as_atom(table)}, :#{as_atom(name)}, check: """
+          #{base_filter} AND #{check}
+        """#{prefix})
+        '''
       else
-        "create constraint(:#{as_atom(table)}, :#{as_atom(name)}, #{join(["check: \"#{check}\")", option(:prefix, schema)])}"
+        ~s'''
+        create constraint(:#{as_atom(table)}, :#{as_atom(name)}, check: """
+          #{check}
+        """#{prefix})
+        '''
       end
     end
   end

test/migration_generator_test.exs

@@ -2240,11 +2240,16 @@ defmodule AshPostgres.MigrationGeneratorTest do
         attributes do
           uuid_primary_key(:id)
           attribute(:price, :integer, public?: true)
+          attribute(:title, :string, public?: true)
         end
 
         postgres do
           check_constraints do
-            check_constraint(:price, "price_must_be_positive", check: "price > 0")
+            check_constraint(:price, "price_must_be_positive", check: ~S["price" > 0])
+
+            check_constraint(:title, "title_must_conform_to_format",
+              check: ~S[title ~= '("\"\\"\\\"\\\\"\\\\\")']
+            )
           end
         end
       end
@@ -2268,7 +2273,18 @@ defmodule AshPostgres.MigrationGeneratorTest do
                |> File.read!()
 
       assert file =~
-               ~S[create constraint(:posts, :price_must_be_positive, check: "price > 0")]
+               ~S'''
+               create constraint(:posts, :price_must_be_positive, check: """
+                 "price" > 0
+               """)
+               '''
+
+      assert file =~
+               ~S'''
+               create constraint(:posts, :title_must_conform_to_format, check: """
+                 title ~= '("\"\\"\\\"\\\\"\\\\\")'
+               """)
+               '''
 
       defposts do
         attributes do
@@ -2307,7 +2323,11 @@ defmodule AshPostgres.MigrationGeneratorTest do
                String.split(down, "drop_if_exists constraint(:posts, :price_must_be_positive)")
 
       assert remaining =~
-               ~S[create constraint(:posts, :price_must_be_positive, check: "price > 0")]
+               ~S'''
+               create constraint(:posts, :price_must_be_positive, check: """
+                 "price" > 0
+               """)
+               '''
     end
 
     test "base filters are taken into account, negated" do
@@ -2349,7 +2369,11 @@ defmodule AshPostgres.MigrationGeneratorTest do
                |> File.read!()
 
       assert file =~
-               ~S[create constraint(:posts, :price_must_be_positive, check: "(price > 0) OR NOT (price > -10)")]
+               ~S'''
+               create constraint(:posts, :price_must_be_positive, check: """
+                 (price > 0) OR NOT (price > -10)
+               """)
+               '''
     end
 
     test "when removed, the constraint is dropped before modification" do