Add data type property into ThemeSetting entity

src/main/java/run/halo/app/model/entity/ThemeSetting.java

@@ -5,6 +5,7 @@ import lombok.EqualsAndHashCode;
 import lombok.ToString;
 import org.hibernate.annotations.SQLDelete;
 import org.hibernate.annotations.Where;
+import run.halo.app.model.enums.DataType;
 
 import javax.persistence.*;
 
@@ -45,4 +46,17 @@ public class ThemeSetting extends BaseEntity {
     @Column(name = "theme_id", columnDefinition = "varchar(255) not null")
     private String themeId;
 
+    @Column(name = "data_type", columnDefinition = "int default 0")
+    private DataType type;
+
+    @Override
+    protected void prePersist() {
+        super.prePersist();
+
+        id = null;
+
+        if (type == null) {
+            type = DataType.STRING;
+        }
+    }
 }

src/main/java/run/halo/app/model/enums/DataType.java

@@ -0,0 +1,30 @@
+package run.halo.app.model.enums;
+
+/**
+ * Data type enum.
+ *
+ * @author johnniang
+ * @date 4/9/19
+ */
+public enum DataType implements ValueEnum<Integer> {
+
+    STRING(0),
+
+    LONG(1),
+
+    DOUBLE(2),
+
+    BOOL(3);
+
+    private Integer value;
+
+    DataType(Integer value) {
+        this.value = value;
+    }
+
+
+    @Override
+    public Integer getValue() {
+        return value;
+    }
+}

src/main/java/run/halo/app/model/enums/converter/DataTypeConverter.java

@@ -0,0 +1,19 @@
+package run.halo.app.model.enums.converter;
+
+import run.halo.app.model.enums.DataType;
+
+import javax.persistence.Converter;
+
+/**
+ * Data type converter.
+ *
+ * @author johnniang
+ * @date 4/10/19
+ */
+@Converter(autoApply = true)
+public class DataTypeConverter extends AbstractConverter<DataType, Integer> {
+
+    public DataTypeConverter() {
+        super(DataType.class);
+    }
+}

src/main/java/run/halo/app/service/impl/ThemeServiceImpl.java

@@ -297,6 +297,9 @@ public class ThemeServiceImpl implements ThemeService {
         // Set the activated theme id
         setActivatedThemeId(themeId);
 
+        // Clear the cache
+        cacheStore.delete(THEMES_CACHE_KEY);
+
         try {
             // TODO Refactor here in the future
             configuration.setSharedVariable("themeName", themeId);