$all tests

lib/mongoid/matcher/all.rb

@@ -8,7 +8,7 @@ module All
           raise Errors::InvalidQuery, "$all argument must be an array: #{Errors::InvalidQuery.truncate_expr(condition)}"
         end
 
-        condition.any? && condition.all? do |c|
+        !condition.empty? && condition.all? do |c|
           case c
           when ::Regexp, BSON::Regexp::Raw
             Regex.matches_array_or_scalar?(value, c)

spec/integration/matcher_operator_data/all.yml

@@ -103,3 +103,27 @@
       $all:
         ceo
   error: true
+
+- name: field value is null
+  document:
+    products: ~
+  query:
+    products:
+      $all: [1, 2]
+  matches: false
+
+- name: field value is numeric
+  document:
+    products: 42
+  query:
+    products:
+      $all: [42]
+  matches: true
+
+- name: field value is null and query is for null value
+  document:
+    products: ~
+  query:
+    products:
+      $all: [~]
+  matches: true

spec/integration/matcher_operator_data/eq.yml

@@ -181,3 +181,11 @@
     positions:
       $eq: ~
   matches: false
+
+- name: null field value vs nil argument
+  document:
+    positions: ~
+  query:
+    positions:
+      $eq: ~
+  matches: true