Merge pull request #7 from shoplineapp/feature/support-json-string-fo…

…r-hash

Feature/support json string for hash

README.md

@@ -131,7 +131,12 @@ schema.to_avro.to_json
 }
 ```
 #### Hash: `string`
-- Expected to be serialized as a JSON string.
+```json
+{
+  "type": "string",
+  "logicalType": "json"
+}
+```
 
 ### Embedded document
 #### Embeds One

lib/mongoid-avro.rb

@@ -144,8 +144,10 @@ def convert_to_avro_format(type: , optional: true)
             default: []
           }
         when "Hash"
-          # Expect to encode unstructed data to json string
-          "string"
+          {
+            "type": "string",
+            "logicalType": "json"
+          }
         else
           # If the type is not recognized, raise an error
           raise ArgumentError, "Unsupported type for avro_format: #{type}"

spec/mongoid_avro_spec.rb

@@ -119,8 +119,13 @@ def get_field_by_name(fields, name)
     context "when default type is Hash" do
       let(:field_name) { "object" }
 
-      it "convert to type: string" do
-        expect(field["type"]).to eq("string")
+      it "convert to type: string and logicalType: json" do
+        expect(field["type"]).to eq(
+          {
+            "logicalType" => "json",
+            "type" => "string"
+          }
+        )
       end
     end
 
@@ -260,8 +265,16 @@ def get_field_by_name(fields, name)
       context "when default type is Hash" do
         let(:field_name) { "object" }
 
-        it "convert to type: string" do
-          expect(field["type"]).to eq(["null", "string"])
+        it "convert to null or type: string with logicalType: json" do
+          expect(field["type"]).to eq(
+            [
+              "null",
+              {
+                "logicalType" => "json",
+                "type" => "string"
+              }
+            ]
+        )
         end
       end