Merge pull request #36 from trocco-io/fix_null_handling

Fix null handling

README.md

@@ -8,19 +8,22 @@ kintone output plugin for Embulk stores app records from kintone.
 
 ## Configuration
 
-- **domain**: kintone domain(FQDN) e.g. devfoo.cybozu.com (string, required)
+- **domain**: kintone domain (FQDN) e.g. devfoo.cybozu.com (string, required)
 - **username**: kintone username (string, optional)
 - **password**: kintone password (string, optional)
 - **token**: kintone app token. Username and password or token must be configured. If all of them are provided, this plugin uses username and password (string, optional)
 - **app_id**: kintone app id (integer, required)
-- **basic_auth_username**:  kintone basic auth username Please see kintone basic auth [here](https://jp.cybozu.help/general/en/admin/list_security/list_ip_basic/basic_auth.html) (string, optional)
-- **basic_auth_password**:  kintone basic auth password (string, optional)
+- **basic_auth_username**: kintone basic auth username Please see kintone basic auth [here](https://jp.cybozu.help/general/en/admin/list_security/list_ip_basic/basic_auth.html) (string, optional)
+- **basic_auth_password**: kintone basic auth password (string, optional)
 - **guest_space_id**: kintone app belongs to guest space, guest space id is required. (integer, optional)
 - **mode**: kintone mode (string, required)
-- **update_key**: column name to set update key (string, required if mode is update or upsert)
+- **update_key**: Column name to set update key (string, required if mode is update or upsert)
+- **prefer_nulls**: Whether to set fields to null instead of default value of type when column is null (boolean, default is `false`)
+- **ignore_nulls**: Whether to completely ignore fields when column is null (boolean, default is `false`)
 - **column_options** advanced: a key-value pairs where key is a column name and value is options for the column.
     - **field_code**: field code (string, required)
-    - **type**: field type (string, required)
+    - **type**: field type (string, required). See [this page](https://cybozu.dev/ja/kintone/docs/overview/field-types/#field-type-update) for list of available types. However, following types are not yet supported
+        - `USER_SELECT`, `ORGANIZATION_SELECT`, `GROUP_SELECT`, `FILE`, `SUBTABLE`
     - **timezone**: timezone to convert into `date` (string, default is `UTC`)
     - **val_sep**: Used to specify multiple checkbox values (string, default is `,`)
 
@@ -43,7 +46,6 @@ out:
     date_time: {field_code: "datetime", type: "DATETIME"}
 ```
 
-
 ## Build
 
 ```

src/main/java/org/embulk/output/kintone/KintoneColumnOption.java

@@ -1,6 +1,5 @@
 package org.embulk.output.kintone;
 
-import java.util.Optional;
 import org.embulk.config.Config;
 import org.embulk.config.ConfigDefault;
 import org.embulk.config.Task;
@@ -14,7 +13,7 @@ public interface KintoneColumnOption extends Task {
 
   @Config("timezone")
   @ConfigDefault("\"UTC\"")
-  Optional<String> getTimezone();
+  String getTimezone();
 
   @Config("val_sep")
   @ConfigDefault("\",\"")