fix: Replace falsy values with json selector

src/codegen/codegen.test.ts

@@ -284,7 +284,7 @@ describe('Code generation', () => {
         },
         {
           type: 'correlation',
-          id: '1',
+          id: '2',
           enabled: true,
           extractor: {
             filter: { path: '' },
@@ -296,6 +296,20 @@ describe('Code generation', () => {
             extractionMode: 'single',
           },
         },
+        {
+          type: 'correlation',
+          id: '3',
+          enabled: true,
+          extractor: {
+            filter: { path: '' },
+            selector: {
+              type: 'json',
+              from: 'body',
+              path: 'is_admin',
+            },
+            extractionMode: 'single',
+          },
+        },
       ]
 
       it('should replace correlated values', async () => {
@@ -321,30 +335,37 @@ describe('Code generation', () => {
             correlation_vars["correlation_0"] = match[1];
           }
 
+          correlation_vars['correlation_1'] = resp.json().is_admin
+
           params = {
             headers: {}, cookies: {}
           }
 
           url = http.url\`http://test.k6.io/api/v1/login?project_id=\${correlation_vars['correlation_0']}\`
           resp = http.request('POST', url, null, params)
 
-          correlation_vars['correlation_1'] = resp.json().user_id
+          correlation_vars['correlation_2'] = resp.json().user_id
         })
 
         group('two', function () {
           params = {
             headers: {}, cookies: {}
           }
 
-          url = http.url\`http://test.k6.io/api/v1/users/\${correlation_vars['correlation_1']}\`
+          url = http.url\`http://test.k6.io/api/v1/users/\${correlation_vars['correlation_2']}\`
           resp = http.request('GET', url, null, params)
 
           params = {
             headers: {}, cookies: {}
           }
 
           url = http.url\`http://test.k6.io/api/v1/users\`
-          resp = http.request('POST', url, \`${JSON.stringify({ user_id: "${correlation_vars['correlation_1']}" })}\`, params)
+          resp = http.request(
+            'POST',
+            url,
+            \`{"user_id":"\${correlation_vars['correlation_2']}","is_admin":\${correlation_vars['correlation_1']}}\`,
+            params
+          )
         })
 
         sleep(1)
@@ -393,7 +414,12 @@ describe('Code generation', () => {
             }
 
             url = http.url\`http://test.k6.io/api/v1/users\`
-            resp = http.request('POST', url, \`${JSON.stringify({ user_id: '333' })}\`, params)
+            resp = http.request(
+              'POST',
+              url,
+              \`${JSON.stringify({ user_id: '333', is_admin: false })}\`,
+              params
+            )
           })
 
           sleep(1)

src/rules/correlation.ts

@@ -70,7 +70,7 @@ function applyRule({
   // this is the modified schema that we return to the accumulator
   const snippetSchemaReturnValue = cloneDeep(requestSnippetSchema)
 
-  if (state.extractedValue) {
+  if (state.extractedValue !== undefined && state.extractedValue !== '') {
     // Skip replacement if replacer filter doesn't match
     if (
       rule.replacer &&
@@ -125,7 +125,7 @@ function applyRule({
       idGenerator
     )
 
-  if (extractedValue && correlationExtractionSnippet) {
+  if (extractedValue !== undefined && correlationExtractionSnippet) {
     // Skip extraction and bump count if value is already extracted and we are in single extraction mode
     if (state.extractedValue && rule.extractor.extractionMode === 'single') {
       setState({
@@ -558,7 +558,7 @@ const extractCorrelationJsonBody = (
   const extractedValue = getJsonObjectFromPath(response.content, selector.path)
 
   if (
-    !extractedValue ||
+    extractedValue === undefined ||
     (Array.isArray(extractedValue) && extractedValue.length === 0)
   ) {
     return noCorrelationResult

src/rules/shared.ts

@@ -255,7 +255,7 @@ export const replaceJsonBody = (
   // TODO: https://github.com/grafana/k6-studio/issues/277
   // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
   const valueToReplace = getJsonObjectFromPath(request.content, selector.path)
-  if (!valueToReplace) return
+  if (valueToReplace === undefined) return
 
   const content = setJsonObjectFromPath(request.content, selector.path, value)
   return { ...request, content }
@@ -528,27 +528,48 @@ if (import.meta.vitest) {
       from: 'body',
       path: '[0].hello',
     }
+
     expect(
       replaceJsonBody(
         selectorMatch,
         generateRequest('{"hello":"world"}'),
         '${correl_0}'
       )?.content
     ).toBe('{"hello":"${correl_0}"}')
+
     expect(
       replaceJsonBody(
         selectorNotMatch,
         generateRequest('{"hello":"world"}'),
         '${correl_0}'
       )
     ).toBeUndefined()
+
     expect(
       replaceJsonBody(
         selectorMatchArray,
         generateRequest('[{"hello":"world"}]'),
         '${correl_0}'
       )?.content
     ).toBe('[{"hello":"${correl_0}"}]')
+
+    // Empty string replacement
+    expect(
+      replaceJsonBody(
+        selectorMatchArray,
+        generateRequest('[{"hello":""}]'),
+        '${correl_0}'
+      )?.content
+    ).toBe('[{"hello":"${correl_0}"}]')
+
+    // Boolean replacement
+    expect(
+      replaceJsonBody(
+        selectorMatchArray,
+        generateRequest('[{"hello":false}]'),
+        '${correl_0}'
+      )?.content
+    ).toBe('[{"hello":"${correl_0}"}]')
   })
 
   it('replaces header name matches', () => {

src/test/fixtures/correlationRecording.ts

@@ -29,7 +29,7 @@ export const correlationRecording: ProxyData[] = [
         ['project', 'project_id=555'],
       ],
       cookies: [],
-      content: JSON.stringify({ user_id: '444' }),
+      content: JSON.stringify({ user_id: '444', is_admin: false }),
       contentLength: 0,
       timestampStart: 0,
     },
@@ -95,7 +95,7 @@ export const correlationRecording: ProxyData[] = [
       query: [],
       scheme: 'http',
       host: 'localhost:3000',
-      content: JSON.stringify({ user_id: '333' }),
+      content: JSON.stringify({ user_id: '333', is_admin: false }),
       path: '/api/v1/users',
       timestampStart: 0,
       timestampEnd: 0,

src/views/Generator/RuleEditor/CorrelationEditor.tsx

@@ -138,7 +138,7 @@ function ExtractedValue({
 
   const extractedValue = selectedRuleInstance?.state?.extractedValue
 
-  if (!extractedValue) {
+  if (extractedValue === undefined) {
     return (
       <Text size="2" color="gray">
         The rule does not match any requests