diff --git a/.travis.yml b/.travis.yml
index da915d1..191dbff 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,8 +13,10 @@ env:
     - AR=4.2.10
     - AR=5.0.6
     - AR=5.1.5
+    - AR=5.2.0
     - AR=latest
     - AR=4.2.10 COMPAT=1
     - AR=5.0.6 COMPAT=1
     - AR=5.1.5 COMPAT=1
+    - AR=5.2.0 COMPAT=1
     - AR=latest COMPAT=1
diff --git a/lib/baby_squeel/active_record/query_methods.rb b/lib/baby_squeel/active_record/query_methods.rb
index ad0c30c..a9c585a 100644
--- a/lib/baby_squeel/active_record/query_methods.rb
+++ b/lib/baby_squeel/active_record/query_methods.rb
@@ -39,9 +39,15 @@ def when_having(&block)
       # This is a monkey patch, and I'm not happy about it.
       # Active Record will call `group_by` on the `joins`. The
       # Injector has a custom `group_by` method that handles
-      # BabySqueel::JoinExpression nodes.
-      def build_joins(manager, joins)
-        super manager, BabySqueel::JoinDependency::Injector.new(joins)
+      # BabySqueel::Join nodes.
+      if ::ActiveRecord::VERSION::MAJOR >= 5 && ::ActiveRecord::VERSION::MINOR >= 2
+        def build_joins(manager, joins, aliases)
+          super manager, BabySqueel::JoinDependency::Injector.new(joins), aliases
+        end
+      else
+        def build_joins(manager, joins)
+          super manager, BabySqueel::JoinDependency::Injector.new(joins)
+        end
       end
     end
   end
diff --git a/spec/baby_squeel/__snapshots__/association_spec.yaml b/spec/baby_squeel/__snapshots__/association_spec.yaml
new file mode 100644
index 0000000..1be18ae
--- /dev/null
+++ b/spec/baby_squeel/__snapshots__/association_spec.yaml
@@ -0,0 +1,7 @@
+---
+BabySqueel::Association#== generates SQL 1: '"posts"."author_id" = 42'
+BabySqueel::Association#!= generates SQL 1: ("posts"."author_id" != 42)
+'BabySqueel::Association#== generates SQL 1 (Active Record: v5.2)': '"posts"."author_id"
+  = ?'
+'BabySqueel::Association#!= generates SQL 1 (Active Record: v5.2)': '"posts"."author_id"
+  != ?'
diff --git a/spec/baby_squeel/association_spec.rb b/spec/baby_squeel/association_spec.rb
index 5e0894e..1e0bc24 100644
--- a/spec/baby_squeel/association_spec.rb
+++ b/spec/baby_squeel/association_spec.rb
@@ -36,9 +36,9 @@
     subject(:association) { create_association Post, :author }
 
     if ActiveRecord::VERSION::MAJOR >= 5
-      it 'returns an wrapped Arel::Nodes::And' do
+      it 'generates SQL' do
         node = association == Author.new(id: 42)
-        expect(node._arel.to_sql).to eq('"posts"."author_id" = 42')
+        expect(node._arel.to_sql).to match_sql_snapshot(variants: ['5.2'])
       end
 
       it 'throws for an invalid comparison' do
@@ -59,9 +59,9 @@
     subject(:association) { create_association Post, :author }
 
     if ActiveRecord::VERSION::MAJOR >= 5
-      it 'returns some wrapped arel' do
+      it 'generates SQL' do
         node = association != Author.new(id: 42)
-        expect(node._arel.to_sql).to eq('("posts"."author_id" != 42)')
+        expect(node._arel.to_sql).to match_sql_snapshot(variants: ['5.2'])
       end
 
       it 'throws for an invalid comparison' do
diff --git a/spec/integration/__snapshots__/sifting_spec.yaml b/spec/integration/__snapshots__/sifting_spec.yaml
index efcd948..82274c7 100644
--- a/spec/integration/__snapshots__/sifting_spec.yaml
+++ b/spec/integration/__snapshots__/sifting_spec.yaml
@@ -9,3 +9,11 @@ BabySqueel::ActiveRecord::Base#sifter yield the root table to the block when ari
   INNER JOIN "authors" ON "authors"."id" = "posts"."author_id" INNER JOIN "comments"
   "author_comments_posts" ON "author_comments_posts"."author_id" = "authors"."id"
   WHERE ("author_comments_posts"."id" > 1)
+'BabySqueel::ActiveRecord::Base#sifter allows the use of a sifter on an association 1 (Active Record: v5.2)': SELECT
+  "posts".* FROM "posts" INNER JOIN "authors" ON "authors"."id" = "posts"."author_id"
+  WHERE "authors"."name" LIKE 'boogies%'
+'BabySqueel::ActiveRecord::Base#sifter yield the root table to the block when arity is given 1 (Active Record: v5.2)': SELECT
+  "posts".* FROM "posts" INNER JOIN "comments" ON "comments"."post_id" = "posts"."id"
+  INNER JOIN "authors" ON "authors"."id" = "posts"."author_id" INNER JOIN "comments"
+  "author_comments_posts" ON "author_comments_posts"."author_id" = "authors"."id"
+  WHERE "author_comments_posts"."id" > 1
diff --git a/spec/integration/__snapshots__/when_having_spec.yaml b/spec/integration/__snapshots__/when_having_spec.yaml
index 83b1c00..ede5e55 100644
--- a/spec/integration/__snapshots__/when_having_spec.yaml
+++ b/spec/integration/__snapshots__/when_having_spec.yaml
@@ -24,3 +24,16 @@
   FROM "posts" INNER JOIN "authors" ON "authors"."id" = "posts"."author_id" INNER
   JOIN "posts" "posts_authors" ON "posts_authors"."author_id" = "authors"."id" GROUP
   BY "posts_authors"."id" HAVING (COUNT("posts_authors"."id") > 5)
+"#when_having adds a having clause 1 (Active Record: v5.2)": SELECT COUNT("posts"."id")
+  FROM "posts" GROUP BY "posts"."author_id" HAVING COUNT("posts"."id") > 5
+"#when_having adds a having clause with a calculation 1 (Active Record: v5.2)": SELECT
+  COUNT("posts"."id") FROM "posts" GROUP BY ("posts"."author_id" + 5) * 3 HAVING COUNT("posts"."id")
+  > 5
+"#when_having adds a having clause with an association 1 (Active Record: v5.2)": SELECT
+  COUNT("posts"."id") FROM "posts" INNER JOIN "authors" ON "authors"."id" = "posts"."author_id"
+  GROUP BY "authors"."id" HAVING COUNT("authors"."id") > 5
+"#when_having adds a having clause with an aliased table 1 (Active Record: v5.2)": SELECT
+  COUNT("posts_authors"."id") FROM "posts" INNER JOIN "authors" ON "authors"."id"
+  = "posts"."author_id" INNER JOIN "posts" "posts_authors" ON "posts_authors"."author_id"
+  = "authors"."id" GROUP BY "posts_authors"."id" HAVING COUNT("posts_authors"."id")
+  > 5
diff --git a/spec/integration/__snapshots__/where_chain_spec.yaml b/spec/integration/__snapshots__/where_chain_spec.yaml
index 45f77e4..fe6ff39 100644
--- a/spec/integration/__snapshots__/where_chain_spec.yaml
+++ b/spec/integration/__snapshots__/where_chain_spec.yaml
@@ -65,3 +65,32 @@
   ("posts"."author_id" = 42)
 "#where.has wheres an association using #!= 1": SELECT "posts".* FROM "posts" WHERE
   (("posts"."author_id" != 42))
+"#where.has wheres on deep associations 1 (Active Record: v5.2)": SELECT "posts".*
+  FROM "posts" INNER JOIN "authors" ON "authors"."id" = "posts"."author_id" INNER
+  JOIN "comments" ON "comments"."author_id" = "authors"."id" WHERE "comments"."id"
+  > 0
+"#where.has wheres on an aliased association 1 (Active Record: v5.2)": SELECT "posts".*
+  FROM "posts" INNER JOIN "authors" ON "authors"."id" = "posts"."author_id" INNER
+  JOIN "posts" "posts_authors" ON "posts_authors"."author_id" = "authors"."id" WHERE
+  "posts_authors"."id" > 0
+"#where.has wheres on an aliased association with through 1 (Active Record: v5.2)": SELECT
+  "posts".* FROM "posts" INNER JOIN "comments" ON "comments"."post_id" = "posts"."id"
+  INNER JOIN "authors" ON "authors"."id" = "posts"."author_id" INNER JOIN "comments"
+  "author_comments_posts" ON "author_comments_posts"."author_id" = "authors"."id"
+  WHERE "author_comments_posts"."id" > 0
+"#where.has wheres on an alias with a function 1 (Active Record: v5.2)": SELECT "posts".*
+  FROM "posts" INNER JOIN "authors" ON "authors"."id" = "posts"."author_id" INNER
+  JOIN "posts" "posts_authors" ON "posts_authors"."author_id" = "authors"."id" WHERE
+  coalesce("posts_authors"."id", 1) > 0
+"#where.has wheres with a not in subquery 1 (Active Record: v5.2)": SELECT "posts".*
+  FROM "posts" WHERE "posts"."author_id" NOT IN (SELECT "authors"."id" FROM "authors"
+  WHERE (1=0))
+"#where.has builds an exists query 1 (Active Record: v5.2)": SELECT "posts".* FROM
+  "posts" WHERE EXISTS(SELECT "posts".* FROM "posts" WHERE "posts"."author_id" = 1)
+"#where.has builds a not exists query 1 (Active Record: v5.2)": SELECT "posts".* FROM
+  "posts" WHERE NOT EXISTS(SELECT "posts".* FROM "posts" WHERE "posts"."author_id"
+  = 1)
+"#where.has wheres an association using #== 1 (Active Record: v5.2)": SELECT "posts".*
+  FROM "posts" WHERE "posts"."author_id" = 42
+"#where.has wheres an association using #!= 1 (Active Record: v5.2)": SELECT "posts".*
+  FROM "posts" WHERE "posts"."author_id" != 42
diff --git a/spec/integration/joining_spec.rb b/spec/integration/joining_spec.rb
index a53c2e4..3a2fd24 100644
--- a/spec/integration/joining_spec.rb
+++ b/spec/integration/joining_spec.rb
@@ -122,12 +122,20 @@
 
     describe 'polymorphism' do
       it 'inner joins' do
+        if ActiveRecord::VERSION::STRING >= '5.2.0'
+          pending "polyamorous's support for polymorphism is broken"
+        end
+
         relation = Picture.joining { imageable.of(Post) }
 
         expect(relation).to match_sql_snapshot
       end
 
       it 'outer joins' do
+        if ActiveRecord::VERSION::STRING >= '5.2.0'
+          pending "polyamorous's support for polymorphism is broken"
+        end
+
         relation = Picture.joining { imageable.of(Post).outer }
 
         expect(relation).to match_sql_snapshot
@@ -156,6 +164,10 @@
       end
 
       it 'handles polymorphism' do
+        if ActiveRecord::VERSION::STRING >= '5.2.0'
+          pending "polyamorous's support for polymorphism is broken"
+        end
+
         relation = Picture.joining { imageable.of(Post).comments }
 
         expect(relation).to match_sql_snapshot
diff --git a/spec/integration/sifting_spec.rb b/spec/integration/sifting_spec.rb
index f3c6ac0..8148133 100644
--- a/spec/integration/sifting_spec.rb
+++ b/spec/integration/sifting_spec.rb
@@ -34,7 +34,7 @@
       author.sift :boogers
     }
 
-    expect(relation).to match_sql_snapshot
+    expect(relation).to match_sql_snapshot(variants: ['5.2'])
   end
 
   it 'yield the root table to the block when arity is given' do
@@ -42,6 +42,6 @@
       sift :author_comments_id, 1
     }
 
-    expect(relation).to match_sql_snapshot
+    expect(relation).to match_sql_snapshot(variants: ['5.2'])
   end
 end
diff --git a/spec/integration/when_having_spec.rb b/spec/integration/when_having_spec.rb
index e44f189..eb21959 100644
--- a/spec/integration/when_having_spec.rb
+++ b/spec/integration/when_having_spec.rb
@@ -6,7 +6,7 @@
                    .grouping { author_id }
                    .when_having { id.count > 5 }
 
-    expect(relation).to match_sql_snapshot(variants: ['4.2'])
+    expect(relation).to match_sql_snapshot(variants: ['4.2', '5.2'])
   end
 
   it 'adds a having clause with a calculation' do
@@ -14,7 +14,7 @@
                    .grouping { (author_id + 5 ) * 3 }
                    .when_having { id.count > 5 }
 
-    expect(relation).to match_sql_snapshot(variants: ['4.2'])
+    expect(relation).to match_sql_snapshot(variants: ['4.2', '5.2'])
   end
 
   it 'adds a having clause with an association' do
@@ -23,7 +23,7 @@
                    .grouping { author.id }
                    .when_having { author.id.count > 5 }
 
-    expect(relation).to match_sql_snapshot(variants: ['4.2'])
+    expect(relation).to match_sql_snapshot(variants: ['4.2', '5.2'])
   end
 
   it 'adds a having clause with an aliased table' do
@@ -32,6 +32,6 @@
                    .grouping { author.posts.id }
                    .when_having { author.posts.id.count > 5 }
 
-    expect(relation).to match_sql_snapshot(variants: ['4.2'])
+    expect(relation).to match_sql_snapshot(variants: ['4.2', '5.2'])
   end
 end
diff --git a/spec/integration/where_chain_spec.rb b/spec/integration/where_chain_spec.rb
index cabf5b5..3ba8344 100644
--- a/spec/integration/where_chain_spec.rb
+++ b/spec/integration/where_chain_spec.rb
@@ -50,7 +50,7 @@
       author.comments.id > 0
     }
 
-    expect(relation).to match_sql_snapshot
+    expect(relation).to match_sql_snapshot(variants: ['5.2'])
   end
 
   it 'wheres on an aliased association' do
@@ -58,7 +58,7 @@
       author.posts.id > 0
     }
 
-    expect(relation).to match_sql_snapshot
+    expect(relation).to match_sql_snapshot(variants: ['5.2'])
   end
 
   it 'wheres on an aliased association with through' do
@@ -66,10 +66,14 @@
       author_comments.id > 0
     }
 
-    expect(relation).to match_sql_snapshot
+    expect(relation).to match_sql_snapshot(variants: ['5.2'])
   end
 
   it 'wheres on polymorphic associations' do
+    if ActiveRecord::VERSION::STRING >= '5.2.0'
+      pending "polyamorous's support for polymorphism is broken"
+    end
+
     relation = Picture.joining { imageable.of(Post) }.where.has {
       imageable.of(Post).title =~ 'meatloaf'
     }
@@ -78,6 +82,10 @@
   end
 
   it 'wheres on polymorphic associations outer join' do
+    if ActiveRecord::VERSION::STRING >= '5.2.0'
+      pending "polyamorous's support for polymorphism is broken"
+    end
+
     relation = Picture.joining { imageable.of(Post).outer }.where.has {
       imageable.of(Post).title =~ 'meatloaf'
     }
@@ -106,7 +114,7 @@
       coalesce(author.posts.id, 1) > 0
     }
 
-    expect(relation).to match_sql_snapshot
+    expect(relation).to match_sql_snapshot(variants: ['5.2'])
   end
 
   it 'wheres with a subquery' do
@@ -141,7 +149,7 @@
       author_id.not_in Author.none.select(:id)
     }
 
-    expect(relation).to match_sql_snapshot
+    expect(relation).to match_sql_snapshot(variants: ['5.2'])
   end
 
   it 'wheres using a simple table' do
@@ -163,7 +171,7 @@
       exists Post.where.has { author_id == 1 }
     }
 
-    expect(relation).to match_sql_snapshot
+    expect(relation).to match_sql_snapshot(variants: ['5.2'])
   end
 
   it 'builds a not exists query' do
@@ -171,7 +179,7 @@
       not_exists Post.where.has { author_id == 1 }
     }
 
-    expect(relation).to match_sql_snapshot
+    expect(relation).to match_sql_snapshot(variants: ['5.2'])
   end
 
   it 'wheres an association using #==' do
@@ -184,7 +192,7 @@
       post.author == author
     end
 
-    expect(relation).to match_sql_snapshot
+    expect(relation).to match_sql_snapshot(variants: ['5.2'])
   end
 
   it 'wheres an association using #!=' do
@@ -197,7 +205,7 @@
       post.author != author
     end
 
-    expect(relation).to match_sql_snapshot
+    expect(relation).to match_sql_snapshot(variants: ['5.2'])
   end
 
   it 'handles a hash' do