fix: preserve previous condition field value on constraint change (parse-community#1969)

Author: sadakchap

src/components/BrowserFilter/BrowserFilter.react.js

@@ -78,6 +78,13 @@ export default class BrowserFilter extends React.Component {
       if (Filters.Constraints[filter.get('constraint')].hasOwnProperty('field')) {
         type = Filters.Constraints[filter.get('constraint')].field;
       }*/
+
+      // since we are preserving previous compareTo value
+      // remove compareTo for constraints which are not comparable
+      let isComparable = Filters.Constraints[filter.get('constraint')].comparable;
+      if (!isComparable) {
+        return filter.delete('compareTo')
+      }
       return filter;
     });
     this.props.onChange(formatted);

src/components/BrowserFilter/FilterRow.react.js

@@ -101,7 +101,7 @@ let FilterRow = ({
       color={active ? 'blue' : 'purple'}
       value={Constraints[currentConstraint].name}
       options={constraints.map((c) => Constraints[c].name)}
-      onChange={(c) => onChangeConstraint(constraintLookup[c])} />
+      onChange={(c) => onChangeConstraint(constraintLookup[c], compareTo)} />
     {compareValue(compareInfo, compareTo, onChangeCompareTo, active, parentContentId)}
     <button type='button' className={styles.remove} onClick={onDeleteRow}><Icon name='minus-solid' width={14} height={14} fill='rgba(0,0,0,0.4)' /></button>
   </div>

src/components/Filter/Filter.react.js

@@ -21,7 +21,7 @@ function changeField(schema, filters, index, newField) {
   return filters.set(index, newFilter);
 }
 
-function changeConstraint(schema, filters, index, newConstraint) {
+function changeConstraint(schema, filters, index, newConstraint, prevCompareTo) {
   let field = filters.get(index).get('field');
   let compareType = schema[field].type;
   if (Object.prototype.hasOwnProperty.call(Filters.Constraints[newConstraint], 'field')) {
@@ -30,7 +30,7 @@ function changeConstraint(schema, filters, index, newConstraint) {
   let newFilter = new Map({
     field: field,
     constraint: newConstraint,
-    compareTo: Filters.DefaultComparisons[compareType]
+    compareTo: prevCompareTo ?? Filters.DefaultComparisons[compareType]
   })
   return filters.set(index, newFilter);
 }
@@ -110,8 +110,8 @@ let Filter = ({ schema, filters, renderRow, onChange, blacklist, className }) =>
           onChangeField: newField => {
             onChange(changeField(schema, filters, i, newField));
           },
-          onChangeConstraint: newConstraint => {
-            onChange(changeConstraint(schema, filters, i, newConstraint));
+          onChangeConstraint: (newConstraint, prevCompareTo) => {
+            onChange(changeConstraint(schema, filters, i, newConstraint, prevCompareTo));
           },
           onChangeCompareTo: newCompare => {
             onChange(changeCompareTo(schema, filters, i, compareType, newCompare));