Rebase to latest DB version and upgrade to Crystal 0.18

spec/dummy_driver.cr

@@ -131,10 +131,18 @@ class DummyDriver < DB::Driver
       read(String).to_i32
     end
 
+    def read(t : Int32?.class)
+      read(String?).try &.to_i32
+    end
+
     def read(t : Int64.class)
       read(String).to_i64
     end
 
+    def read(t : Int64?.class)
+      read(String?).try &.to_i64
+    end
+
     def read(t : Float32.class)
       read(String).to_f32
     end

spec/dummy_driver_spec.cr

@@ -96,6 +96,19 @@ describe DummyDriver do
       end
     end
 
+    it "should enumerate nillable int64 fields" do
+      with_dummy do |db|
+        db.query "3,4 1,NULL" do |rs|
+          rs.move_next
+          rs.read(Int64 | Nil).should eq(3i64)
+          rs.read(Int64 | Nil).should eq(4i64)
+          rs.move_next
+          rs.read(Int64 | Nil).should eq(1i64)
+          rs.read(Int64 | Nil).should be_nil
+        end
+      end
+    end
+
     describe "query one" do
       it "queries" do
         with_dummy do |db|

spec/mapping_spec.cr

@@ -8,6 +8,13 @@ class SimpleMapping
   })
 end
 
+class NonStrictMapping
+  DB.mapping({
+    c1: Int32,
+    c2: String
+  }, strict: false)
+end
+
 class MappingWithDefaults
   DB.mapping({
     c0: { type: Int32, default: 10 },
@@ -17,7 +24,7 @@ end
 
 class MappingWithNilables
   DB.mapping({
-    c0: { type: Int32, nilable: true },
+    c0: { type: Int32, nilable: true, default: 10 },
     c1: { type: String, nilable: true },
   })
 end
@@ -79,6 +86,10 @@ describe "DB.mapping" do
     expect_raises { from_dummy("1,a,b", SimpleMapping) }
   end
 
+  it "should initialize a non-strict mapping if there is an unexpected column" do
+    expect_mapping("1,2,a,b", NonStrictMapping, {c1: 2, c2: "a"})
+  end
+
   it "should initialize a mapping with default values" do
     expect_mapping("1,a", MappingWithDefaults, {c0: 1, c1: "a"})
   end
@@ -87,10 +98,18 @@ describe "DB.mapping" do
     expect_mapping("1", MappingWithDefaults, {c0: 1, c1: "c"})
   end
 
+  it "should initialize a mapping using default values if values are nil and types are non nilable" do
+    expect_mapping("1,NULL", MappingWithDefaults, {c0: 1, c1: "c"})
+  end
+
   it "should initialize a mapping with nils if columns are missing" do
     expect_mapping("1", MappingWithNilables, {c0: 1, c1: nil})
   end
 
+  it "should initialize a mapping with nils ignoring default value is type is nilable" do
+    expect_mapping("NULL,a", MappingWithNilables, {c0: nil, c1: "a"})
+  end
+
   it "should initialize a mapping with different keys" do
     expect_mapping("1,a", MappingWithKeys, {foo: 1, bar: "a"})
   end

spec/result_set_spec.cr

@@ -41,15 +41,15 @@ describe DB::ResultSet do
       end
       the_rs.closed?.should be_true
     end
+  end
 
   it "should enumerate columns" do
     cols = [] of String
 
     with_dummy do |db|
       db.query "3,4 1,2" do |rs|
-        rs.each_column do |col, col_type|
+        rs.each_column do |col|
           cols << col
-          col_type.should eq(Slice(UInt8))
         end
       end
     end

src/db/mapping.cr

@@ -57,7 +57,7 @@ module DB
   # This macro also declares instance variables of the types given in the mapping.
   macro mapping(properties, strict = true)
     {% for key, value in properties %}
-      {% properties[key] = {type: value} unless value.is_a?(HashLiteral) %}
+      {% properties[key] = {type: value} unless value.is_a?(HashLiteral) || value.is_a?(NamedTupleLiteral) %}
     {% end %}
 
     {% for key, value in properties %}
@@ -86,7 +86,7 @@ module DB
         %found{key.id} = false
       {% end %}
 
-      %rs.each_column do |col_name, col_type|
+      %rs.each_column do |col_name|
         case col_name
           {% for key, value in properties %}
             when {{value[:key] || key.id.stringify}}
@@ -95,7 +95,7 @@ module DB
                 {% if value[:converter] %}
                   {{value[:converter]}}.from_rs(%rs)
                 {% elsif value[:nilable] || value[:default] != nil %}
-                  %rs.read?({{value[:type]}})
+                  %rs.read(Union({{value[:type]}} | Nil))
                 {% else %}
                   %rs.read({{value[:type]}})
                 {% end %}
@@ -104,8 +104,7 @@ module DB
             {% if strict %}
               raise DB::MappingException.new("unknown result set attribute: #{col_name}")
             {% else %}
-              # TODO: col_type can be Nil, and read?(Nil) is undefined; how to skip a column?
-              #%rs.read?(col_type)
+              %rs.read(Nil)
             {% end %}
         end
       end

src/db/result_set.cr

@@ -44,7 +44,7 @@ module DB
     # Iterates over all the columns
     def each_column
       column_count.times do |x|
-        yield column_name(x), column_type(x)
+        yield column_name(x)
       end
     end