diff --git a/app/assets/javascripts/discourse/app/components/summary-box.hbs b/app/assets/javascripts/discourse/app/components/summary-box.hbs
index 4de34ca792f..d387b6780f1 100644
--- a/app/assets/javascripts/discourse/app/components/summary-box.hbs
+++ b/app/assets/javascripts/discourse/app/components/summary-box.hbs
@@ -1,9 +1,9 @@
 <div class="summary-box__container">
-  {{#if @postAttrs.hasTopRepliesSummary}}
+  {{#if this.topRepliesSummaryEnabled}}
     <p>{{html-safe this.topRepliesSummaryInfo}}</p>
   {{/if}}
   <div class="summarization-buttons">
-    {{#if @postAttrs.summarizable}}
+    {{#if @topic.summarizable}}
       {{#if this.summary.showSummaryBox}}
         <DButton
           @action={{@collapseSummary}}
@@ -24,13 +24,9 @@
       {{/if}}
     {{/if}}
 
-    {{#if @postAttrs.hasTopRepliesSummary}}
+    {{#if this.topRepliesSummaryEnabled}}
       <DButton
-        @action={{if
-          @postAttrs.topicSummaryEnabled
-          @cancelFilter
-          @showTopReplies
-        }}
+        @action={{if @postStream.summary @cancelFilter @showTopReplies}}
         @translatedTitle={{this.topRepliesTitle}}
         @translatedLabel={{this.topRepliesLabel}}
         @icon={{this.topRepliesIcon}}
diff --git a/app/assets/javascripts/discourse/app/components/summary-box.js b/app/assets/javascripts/discourse/app/components/summary-box.js
index 3a19953a3ab..c1edf820eba 100644
--- a/app/assets/javascripts/discourse/app/components/summary-box.js
+++ b/app/assets/javascripts/discourse/app/components/summary-box.js
@@ -8,7 +8,7 @@ export default class SummaryBox extends Component {
   @service siteSettings;
 
   get summary() {
-    return this.args.postAttrs.summary;
+    return this.args.postStream.topicSummary;
   }
 
   get generateSummaryTitle() {
@@ -27,7 +27,7 @@ export default class SummaryBox extends Component {
     let outdatedText = I18n.t("summary.outdated");
 
     if (
-      !this.args.postAttrs.hasTopRepliesSummary &&
+      !this.topRepliesSummaryEnabled &&
       this.summary.newPostsSinceSummary > 0
     ) {
       outdatedText += " ";
@@ -40,29 +40,29 @@ export default class SummaryBox extends Component {
   }
 
   get topRepliesSummaryEnabled() {
-    return this.args.postAttrs.topicSummaryEnabled;
+    return this.args.topic.has_summary;
   }
 
   get topRepliesSummaryInfo() {
-    if (this.args.postAttrs.topicSummaryEnabled) {
+    if (this.topRepliesSummaryEnabled) {
       return I18n.t("summary.enabled_description");
     }
 
-    const wordCount = this.args.postAttrs.topicWordCount;
+    const wordCount = this.args.topic.word_count;
     if (wordCount && this.siteSettings.read_time_word_count > 0) {
       const readingTime = Math.ceil(
         Math.max(
           wordCount / this.siteSettings.read_time_word_count,
-          (this.args.postAttrs.topicPostsCount * MIN_POST_READ_TIME) / 60
+          (this.args.topic.posts_count * MIN_POST_READ_TIME) / 60
         )
       );
       return I18n.messageFormat("summary.description_time_MF", {
-        replyCount: this.args.postAttrs.topicReplyCount,
+        replyCount: this.args.topic.replyCount,
         readingTime,
       });
     }
     return I18n.t("summary.description", {
-      count: this.args.postAttrs.topicReplyCount,
+      count: this.args.topic.replyCount,
     });
   }
 
diff --git a/app/assets/javascripts/discourse/app/components/topic-map.gjs b/app/assets/javascripts/discourse/app/components/topic-map.gjs
index 4c11d92f691..155bfa61f2f 100644
--- a/app/assets/javascripts/discourse/app/components/topic-map.gjs
+++ b/app/assets/javascripts/discourse/app/components/topic-map.gjs
@@ -9,7 +9,11 @@ import concatClass from "discourse/helpers/concat-class";
 import or from "truth-helpers/helpers/or";
 
 export default class TopicMap extends Component {
-  @tracked collapsed = !this.args.postAttrs.hasTopRepliesSummary;
+  @tracked collapsed = !this.args.model.has_summary;
+
+  get userFilters() {
+    return this.args.postStream.userFilters || [];
+  }
 
   @action
   toggleMap() {
@@ -19,9 +23,11 @@ export default class TopicMap extends Component {
   <template>
     <section class={{concatClass "map" (if this.collapsed "map-collapsed")}}>
       <TopicMapSummary
-        @postAttrs={{@postAttrs}}
+        @topic={{@model}}
+        @topicDetails={{@topicDetails}}
         @toggleMap={{this.toggleMap}}
         @collapsed={{this.collapsed}}
+        @userFilters={{this.userFilters}}
       />
     </section>
     {{#unless this.collapsed}}
@@ -29,13 +35,17 @@ export default class TopicMap extends Component {
         class="topic-map-expanded"
         id="topic-map-expanded__aria-controls"
       >
-        <TopicMapExpanded @postAttrs={{@postAttrs}} />
+        <TopicMapExpanded
+          @topicDetails={{@topicDetails}}
+          @userFilters={{this.userFilters}}
+        />
       </section>
     {{/unless}}
-    {{#if (or @postAttrs.hasTopRepliesSummary @postAttrs.summarizable)}}
+    {{#if (or @model.has_summary @model.summarizable)}}
       <section class="information toggle-summary">
         <SummaryBox
-          @postAttrs={{@postAttrs}}
+          @topic={{@model}}
+          @postStream={{@postStream}}
           @cancelFilter={{@cancelFilter}}
           @showTopReplies={{@showTopReplies}}
           @collapseSummary={{@collapseSummary}}
@@ -43,10 +53,10 @@ export default class TopicMap extends Component {
         />
       </section>
     {{/if}}
-    {{#if @postAttrs.showPMMap}}
+    {{#if @showPMMap}}
       <section class="information private-message-map">
         <PrivateMessageMap
-          @postAttrs={{@postAttrs}}
+          @topicDetails={{@topicDetails}}
           @showInvite={{@showInvite}}
           @removeAllowedGroup={{@removeAllowedGroup}}
           @removeAllowedUser={{@removeAllowedUser}}
diff --git a/app/assets/javascripts/discourse/app/components/topic-map/private-message-map.gjs b/app/assets/javascripts/discourse/app/components/topic-map/private-message-map.gjs
index ad82a1ebfcf..2df6ef3c353 100644
--- a/app/assets/javascripts/discourse/app/components/topic-map/private-message-map.gjs
+++ b/app/assets/javascripts/discourse/app/components/topic-map/private-message-map.gjs
@@ -17,19 +17,19 @@ export default class PrivateMessageMap extends Component {
   get participantsClasses() {
     return !this.isEditing &&
       this.site.mobileView &&
-      this.args.postAttrs.allowedGroups.length > 4
+      this.args.topicDetails.allowed_groups.length > 4
       ? "participants hide-names"
       : "participants";
   }
 
   get canInvite() {
-    return this.args.postAttrs.canInvite;
+    return this.args.topicDetails.can_invite_to;
   }
 
   get canRemove() {
     return (
-      this.args.postAttrs.canRemoveAllowedUsers ||
-      this.args.postAttrs.canRemoveSelfId
+      this.args.topicDetails.can_remove_allowed_users ||
+      this.args.topicDetails.can_remove_self_id
     );
   }
 
@@ -58,20 +58,20 @@ export default class PrivateMessageMap extends Component {
 
   <template>
     <div class={{this.participantsClasses}}>
-      {{#each @postAttrs.allowedGroups as |group|}}
+      {{#each @topicDetails.allowed_groups as |group|}}
         <PmMapUserGroup
           @model={{group}}
           @isEditing={{this.isEditing}}
-          @canRemoveAllowedUsers={{@postAttrs.canRemoveAllowedUsers}}
+          @canRemoveAllowedUsers={{@topicDetails.can_remove_allowed_users}}
           @removeAllowedGroup={{@removeAllowedGroup}}
         />
       {{/each}}
-      {{#each @postAttrs.allowedUsers as |user|}}
+      {{#each @topicDetails.allowed_users as |user|}}
         <PmMapUser
           @model={{user}}
           @isEditing={{this.isEditing}}
-          @canRemoveAllowedUsers={{@postAttrs.canRemoveAllowedUsers}}
-          @canRemoveSelfId={{@postAttrs.canRemoveSelfId}}
+          @canRemoveAllowedUsers={{@topicDetails.can_remove_allowed_users}}
+          @canRemoveSelfId={{@topicDetails.can_remove_self_id}}
           @removeAllowedUser={{@removeAllowedUser}}
         />
       {{/each}}
diff --git a/app/assets/javascripts/discourse/app/components/topic-map/topic-map-expanded.gjs b/app/assets/javascripts/discourse/app/components/topic-map/topic-map-expanded.gjs
index 6347ed7c00b..ed2cc059b83 100644
--- a/app/assets/javascripts/discourse/app/components/topic-map/topic-map-expanded.gjs
+++ b/app/assets/javascripts/discourse/app/components/topic-map/topic-map-expanded.gjs
@@ -14,6 +14,14 @@ const TRUNCATED_LINKS_LIMIT = 5;
 export default class TopicMapExpanded extends Component {
   @tracked allLinksShown = false;
 
+  get topicLinks() {
+    return this.args.topicDetails.links;
+  }
+
+  get participants() {
+    return this.args.topicDetails.participants;
+  }
+
   @action
   showAllLinks() {
     this.allLinksShown = true;
@@ -21,21 +29,21 @@ export default class TopicMapExpanded extends Component {
 
   get linksToShow() {
     return this.allLinksShown
-      ? this.args.postAttrs.topicLinks
-      : this.args.postAttrs.topicLinks.slice(0, TRUNCATED_LINKS_LIMIT);
+      ? this.topicLinks
+      : this.topicLinks.slice(0, TRUNCATED_LINKS_LIMIT);
   }
 
   <template>
-    {{#if @postAttrs.participants}}
+    {{#if this.participants}}
       <section class="avatars">
         <TopicParticipants
           @title={{i18n "topic_map.participants_title"}}
-          @userFilters={{@postAttrs.userFilters}}
-          @participants={{@postAttrs.participants}}
+          @userFilters={{@userFilters}}
+          @participants={{this.participants}}
         />
       </section>
     {{/if}}
-    {{#if @postAttrs.topicLinks}}
+    {{#if this.topicLinks}}
       <section class="links">
         <h3>{{i18n "topic_map.links_title"}}</h3>
         <table class="topic-links">
@@ -66,7 +74,7 @@ export default class TopicMapExpanded extends Component {
         {{#if
           (and
             (not this.allLinksShown)
-            (lt TRUNCATED_LINKS_LIMIT @postAttrs.topicLinks.length)
+            (lt TRUNCATED_LINKS_LIMIT this.topicLinks.length)
           )
         }}
           <div class="link-summary">
diff --git a/app/assets/javascripts/discourse/app/components/topic-map/topic-map-summary.gjs b/app/assets/javascripts/discourse/app/components/topic-map/topic-map-summary.gjs
index bd580190d06..6b60ea68558 100644
--- a/app/assets/javascripts/discourse/app/components/topic-map/topic-map-summary.gjs
+++ b/app/assets/javascripts/discourse/app/components/topic-map/topic-map-summary.gjs
@@ -10,6 +10,18 @@ import i18n from "discourse-common/helpers/i18n";
 import { avatarImg } from "discourse-common/lib/avatar-utils";
 
 export default class TopicMapSummary extends Component {
+  get linksCount() {
+    return this.args.topicDetails.links?.length ?? 0;
+  }
+
+  get createdByUsername() {
+    return this.args.topicDetails.created_by?.username;
+  }
+
+  get lastPosterUsername() {
+    return this.args.topicDetails.last_poster?.username;
+  }
+
   get toggleMapButton() {
     return {
       title: this.args.collapsed
@@ -25,20 +37,20 @@ export default class TopicMapSummary extends Component {
   get shouldShowParticipants() {
     return (
       this.args.collapsed &&
-      this.args.postAttrs.topicPostsCount > 2 &&
-      this.args.postAttrs.participants &&
-      this.args.postAttrs.participants.length > 0
+      this.args.topic.posts_count > 2 &&
+      this.args.topicDetails.participants &&
+      this.args.topicDetails.participants.length > 0
     );
   }
 
   get createdByAvatar() {
     return htmlSafe(
       avatarImg({
-        avatarTemplate: this.args.postAttrs.createdByAvatarTemplate,
+        avatarTemplate: this.args.topicDetails.created_by?.avatar_template,
         size: "tiny",
         title:
-          this.args.postAttrs.createdByName ||
-          this.args.postAttrs.createdByUsername,
+          this.args.topicDetails.created_by?.name ||
+          this.args.topicDetails.created_by?.username,
       })
     );
   }
@@ -46,11 +58,11 @@ export default class TopicMapSummary extends Component {
   get lastPostAvatar() {
     return htmlSafe(
       avatarImg({
-        avatarTemplate: this.args.postAttrs.lastPostAvatarTemplate,
+        avatarTemplate: this.args.topicDetails.last_poster?.avatar_template,
         size: "tiny",
         title:
-          this.args.postAttrs.lastPostName ||
-          this.args.postAttrs.lastPostUsername,
+          this.args.topicDetails.last_poster?.name ||
+          this.args.topicDetails.last_poster?.username,
       })
     );
   }
@@ -72,71 +84,67 @@ export default class TopicMapSummary extends Component {
         <div class="topic-map-post created-at">
           <a
             class="trigger-user-card"
-            data-user-card={{@postAttrs.createdByUsername}}
-            title={{@postAttrs.createdByUsername}}
+            data-user-card={{this.createdByUsername}}
+            title={{this.createdByUsername}}
             aria-hidden="true"
           />
           {{this.createdByAvatar}}
-          <RelativeDate @date={{@postAttrs.topicCreatedAt}} />
+          <RelativeDate @date={{@topic.created_at}} />
         </div>
       </li>
       <li class="last-reply">
-        <a href={{@postAttrs.lastPostUrl}}>
+        <a href={{@topic.lastPostUrl}}>
           <h4 role="presentation">{{i18n "last_reply_lowercase"}}</h4>
           <div class="topic-map-post last-reply">
             <a
               class="trigger-user-card"
-              data-user-card={{@postAttrs.lastPostUsername}}
-              title={{@postAttrs.lastPostUsername}}
+              data-user-card={{this.lastPosterUsername}}
+              title={{this.lastPosterUsername}}
               aria-hidden="true"
             />
             {{this.lastPostAvatar}}
-            <RelativeDate @date={{@postAttrs.lastPostAt}} />
+            <RelativeDate @date={{@topic.last_posted_at}} />
           </div>
         </a>
       </li>
       <li class="replies">
-        {{number @postAttrs.topicReplyCount noTitle="true"}}
+        {{number @topic.replyCount noTitle="true"}}
         <h4 role="presentation">{{i18n
             "replies_lowercase"
-            count=@postAttrs.topicReplyCount
+            count=@topic.replyCount
           }}</h4>
       </li>
       <li class="secondary views">
-        {{number
-          @postAttrs.topicViews
-          noTitle="true"
-          class=@postAttrs.topicViewsHeat
-        }}
+        {{number @topic.views noTitle="true" class=@topic.viewsHeat}}
         <h4 role="presentation">{{i18n
             "views_lowercase"
-            count=@postAttrs.topicViews
+            count=@topic.views
           }}</h4>
       </li>
-      {{#if (gt @postAttrs.participantCount 0)}}
+      {{#if (gt @topic.participant_count 0)}}
         <li class="secondary users">
-          {{number @postAttrs.participantCount noTitle="true"}}
+          {{number @topic.participant_count noTitle="true"}}
           <h4 role="presentation">{{i18n
               "users_lowercase"
-              count=@postAttrs.participantCount
+              count=@topic.participant_count
             }}</h4>
         </li>
       {{/if}}
-      {{#if (gt @postAttrs.topicLikeCount 0)}}
+      {{#if (gt @topic.like_count 0)}}
         <li class="secondary likes">
-          {{number @postAttrs.topicLikeCount noTitle="true"}}
+          {{number @topic.like_count noTitle="true"}}
           <h4 role="presentation">{{i18n
               "likes_lowercase"
-              count=@postAttrs.topicLikeCount
+              count=@topic.like_count
             }}</h4>
         </li>
       {{/if}}
-      {{#if (gt @postAttrs.topicLinkCount 0)}}
+      {{#if (gt this.linksCount 0)}}
         <li class="secondary links">
-          {{number @postAttrs.topicLinkCount noTitle="true"}}
+          {{number this.linksCount noTitle="true"}}
           <h4 role="presentation">{{i18n
               "links_lowercase"
-              count=@postAttrs.topicLinkCount
+              count=this.linksCount
             }}</h4>
         </li>
       {{/if}}
@@ -144,8 +152,8 @@ export default class TopicMapSummary extends Component {
       {{#if this.shouldShowParticipants}}
         <li class="avatars">
           <TopicParticipants
-            @participants={{slice 0 3 @postAttrs.participants}}
-            @userFilters={{@postAttrs.userFilters}}
+            @participants={{slice 0 3 @topicDetails.participants}}
+            @userFilters={{@userFilters}}
           />
         </li>
       {{/if}}
diff --git a/app/assets/javascripts/discourse/app/widgets/post.js b/app/assets/javascripts/discourse/app/widgets/post.js
index 36e69bb76b4..69a2e7591c7 100644
--- a/app/assets/javascripts/discourse/app/widgets/post.js
+++ b/app/assets/javascripts/discourse/app/widgets/post.js
@@ -755,7 +755,10 @@ createWidget("post-body", {
       this,
       "div.topic-map",
       hbs`<TopicMap
-        @postAttrs={{@data.postAttrs}}
+        @model={{@data.model}}
+        @topicDetails={{@data.topicDetails}}
+        @postStream={{@data.postStream}}
+        @showPMMap={{@data.showPMMap}}
         @cancelFilter={{@data.cancelFilter}}
         @showTopReplies={{@data.showTopReplies}}
         @collapseSummary={{@data.collapseSummary}}
@@ -765,7 +768,10 @@ createWidget("post-body", {
         @removeAllowedUser={{@data.removeAllowedUser}}
       />`,
       {
-        postAttrs: attrs,
+        model: attrs.topic,
+        topicDetails: attrs.topic.get("details"),
+        postStream: attrs.topic.postStream,
+        showPMMap: attrs.showPMMap,
         cancelFilter: () => this.sendWidgetAction("cancelFilter"),
         showTopReplies: () => this.sendWidgetAction("showTopReplies"),
         collapseSummary: () => this.sendWidgetAction("collapseSummary"),
diff --git a/app/assets/javascripts/discourse/tests/integration/components/widgets/post-test.js b/app/assets/javascripts/discourse/tests/integration/components/widgets/post-test.js
index 5faadad1167..c77a6344ce8 100644
--- a/app/assets/javascripts/discourse/tests/integration/components/widgets/post-test.js
+++ b/app/assets/javascripts/discourse/tests/integration/components/widgets/post-test.js
@@ -780,10 +780,16 @@ module("Integration | Component | Widget | post", function (hooks) {
   });
 
   test("topic map - few posts", async function (assert) {
+    const store = getOwner(this).lookup("service:store");
+    const topic = store.createRecord("topic", { id: 123 });
+    topic.details.set("participants", [
+      { username: "eviltrout" },
+      { username: "codinghorror" },
+    ]);
     this.set("args", {
+      topic,
       showTopicMap: true,
       topicPostsCount: 2,
-      participants: [{ username: "eviltrout" }, { username: "codinghorror" }],
     });
 
     await render(hbs`<MountWidget @widget="post" @args={{this.args}} />`);
@@ -794,16 +800,19 @@ module("Integration | Component | Widget | post", function (hooks) {
   });
 
   test("topic map - participants", async function (assert) {
+    const store = getOwner(this).lookup("service:store");
+    const topic = store.createRecord("topic", { id: 123, posts_count: 10 });
+    topic.postStream.setProperties({ userFilters: ["sam", "codinghorror"] });
+    topic.details.set("participants", [
+      { username: "eviltrout" },
+      { username: "codinghorror" },
+      { username: "sam" },
+      { username: "ZogStrIP" },
+    ]);
+
     this.set("args", {
+      topic,
       showTopicMap: true,
-      topicPostsCount: 10,
-      participants: [
-        { username: "eviltrout" },
-        { username: "codinghorror" },
-        { username: "sam" },
-        { username: "ZogStrIP" },
-      ],
-      userFilters: ["sam", "codinghorror"],
     });
 
     await render(hbs`<MountWidget @widget="post" @args={{this.args}} />`);
@@ -816,17 +825,17 @@ module("Integration | Component | Widget | post", function (hooks) {
   });
 
   test("topic map - links", async function (assert) {
-    this.set("args", {
-      showTopicMap: true,
-      topicLinks: [
-        { url: "http://link1.example.com", clicks: 0 },
-        { url: "http://link2.example.com", clicks: 0 },
-        { url: "http://link3.example.com", clicks: 0 },
-        { url: "http://link4.example.com", clicks: 0 },
-        { url: "http://link5.example.com", clicks: 0 },
-        { url: "http://link6.example.com", clicks: 0 },
-      ],
-    });
+    const store = getOwner(this).lookup("service:store");
+    const topic = store.createRecord("topic", { id: 123 });
+    topic.details.set("links", [
+      { url: "http://link1.example.com", clicks: 0 },
+      { url: "http://link2.example.com", clicks: 0 },
+      { url: "http://link3.example.com", clicks: 0 },
+      { url: "http://link4.example.com", clicks: 0 },
+      { url: "http://link5.example.com", clicks: 0 },
+      { url: "http://link6.example.com", clicks: 0 },
+    ]);
+    this.set("args", { topic, showTopicMap: true });
 
     await render(hbs`<MountWidget @widget="post" @args={{this.args}} />`);
 
@@ -845,7 +854,9 @@ module("Integration | Component | Widget | post", function (hooks) {
   });
 
   test("topic map - no summary", async function (assert) {
-    this.set("args", { showTopicMap: true });
+    const store = getOwner(this).lookup("service:store");
+    const topic = store.createRecord("topic", { id: 123 });
+    this.set("args", { topic, showTopicMap: true });
 
     await render(hbs`<MountWidget @widget="post" @args={{this.args}} />`);
 
@@ -853,7 +864,9 @@ module("Integration | Component | Widget | post", function (hooks) {
   });
 
   test("topic map - has top replies summary", async function (assert) {
-    this.set("args", { showTopicMap: true, hasTopRepliesSummary: true });
+    const store = getOwner(this).lookup("service:store");
+    const topic = store.createRecord("topic", { id: 123, has_summary: true });
+    this.set("args", { topic, showTopicMap: true });
     this.set("showTopReplies", () => (this.summaryToggled = true));
 
     await render(
@@ -867,11 +880,15 @@ module("Integration | Component | Widget | post", function (hooks) {
   });
 
   test("pm map", async function (assert) {
+    const store = getOwner(this).lookup("service:store");
+    const topic = store.createRecord("topic", { id: 123 });
+    topic.details.set("allowed_users", [
+      EmberObject.create({ username: "eviltrout" }),
+    ]);
     this.set("args", {
+      topic,
       showTopicMap: true,
       showPMMap: true,
-      allowedGroups: [],
-      allowedUsers: [EmberObject.create({ username: "eviltrout" })],
     });
 
     await render(hbs`<MountWidget @widget="post" @args={{this.args}} />`);