Add table to error for duplicate column definitions

If a migration defines duplicate columns for a table the error message
should show which table it concerns.

Author: p8

activerecord/CHANGELOG.md

@@ -1,3 +1,10 @@
+*   Add table to error for duplicate column definitions.
+
+    If a migration defines duplicate columns for a table, the error message
+    shows which table it concerns.
+
+    *Petrik de Heus*
+
 *   Fix erroneous nil default precision on virtual datetime columns.
 
     Prior to this change, virtual datetime columns did not have the same

activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb

@@ -469,9 +469,9 @@ def column(name, type, index: nil, **options)
 
         if @columns_hash[name]
           if @columns_hash[name].primary_key?
-            raise ArgumentError, "you can't redefine the primary key column '#{name}'. To define a custom primary key, pass { id: false } to create_table."
+            raise ArgumentError, "you can't redefine the primary key column '#{name}' on '#{@name}'. To define a custom primary key, pass { id: false } to create_table."
           else
-            raise ArgumentError, "you can't define an already defined column '#{name}'."
+            raise ArgumentError, "you can't define an already defined column '#{name}' on '#{@name}'."
           end
         end
 

activerecord/test/cases/migration/change_schema_test.rb

@@ -183,7 +183,7 @@ def test_create_table_raises_when_redefining_primary_key_column
           end
         end
 
-        assert_equal "you can't redefine the primary key column 'id'. To define a custom primary key, pass { id: false } to create_table.", error.message
+        assert_equal "you can't redefine the primary key column 'id' on 'testings'. To define a custom primary key, pass { id: false } to create_table.", error.message
       end
 
       def test_create_table_raises_when_redefining_custom_primary_key_column
@@ -193,7 +193,7 @@ def test_create_table_raises_when_redefining_custom_primary_key_column
           end
         end
 
-        assert_equal "you can't redefine the primary key column 'testing_id'. To define a custom primary key, pass { id: false } to create_table.", error.message
+        assert_equal "you can't redefine the primary key column 'testing_id' on 'testings'. To define a custom primary key, pass { id: false } to create_table.", error.message
       end
 
       def test_create_table_raises_when_defining_existing_column
@@ -204,7 +204,7 @@ def test_create_table_raises_when_defining_existing_column
           end
         end
 
-        assert_equal "you can't define an already defined column 'testing_column'.", error.message
+        assert_equal "you can't define an already defined column 'testing_column' on 'testings'.", error.message
       end
 
       def test_create_table_with_timestamps_should_create_datetime_columns