feed dropdown extension uses replace options mixin

app/blocks/feed/get_value.js

@@ -10,6 +10,7 @@ export default {
     tooltip: "The last value of this feed or component, always a String"
   },
 
+  mixins: ['replaceDropdownOptions'],
   extensions: ['populateFeedDropdown'],
 
   lines: [

app/blocks/feed/set_value.js

@@ -10,6 +10,7 @@ export default {
     colour: 300
   },
 
+  mixins: ['replaceDropdownOptions'],
   extensions: ['populateFeedDropdown'],
 
   connections: {

app/extensions/populate_feed_dropdown.js

@@ -1,41 +1,14 @@
 // Populates Feed dropdowns with name FEED_KEY to contain the user's feeds
 // that are viable for Actions. Provided by the backend at runtime.
 export const populateFeedDropdown = ({ block, data, Blockly }) => {
-  const
-    { feedOptions } = data,
-    FIELD_KEY = "FEED_KEY"
+  const { feedOptions } = data
 
   if(!feedOptions) {
     console.error(`[extensions.populateFeedDropdown] No feedOptions found in extension data.`)
     return
   }
 
-  // search this block's inputs...
-  let input, foundFieldAt
-  for (let i = 0; i < block.inputList.length;i++) {
-    input = block.inputList[i]
-
-    // ...and the input's fields...
-    for (let j = 0; j < input.fieldRow.length;j++) {
-      // ...for a field with the right name...
-      if(input.fieldRow[j].name == FIELD_KEY) {
-        // ...and record its index
-        foundFieldAt = j
-        break
-      }
-    }
-
-    // stop iterating inputs when field is found
-    if(foundFieldAt) { break }
-  }
-
-  if(!foundFieldAt) {
-    console.error(`[extensions.populateFeedDropdown] No field named "${FIELD_KEY}" found in ${block.type} block.`)
-    return
-  }
-
-  input.removeField(FIELD_KEY)
-  input.insertFieldAt(foundFieldAt, new Blockly.FieldDropdown(feedOptions), FIELD_KEY)
+  block.replaceDropdownOptions("FEED_KEY", feedOptions)
 }
 
 // also export as default

app/mixins/replace_dropdown_options.js

@@ -21,7 +21,7 @@ export const replaceDropdownOptions = function(fieldKey, newOptions) {
   }
 
   if(!foundFieldAt) {
-    console.error(`[mixins.relaceDropdown] No field named "${fieldKey}" found in ${this.type} block.`)
+    console.error(`[mixins.relaceDropdownOptions] No field named "${fieldKey}" found in ${this.type} block.`)
     return
   }