diff --git a/src/compiler/code_generator.ts b/src/compiler/code_generator.ts
index 38af8515..9e3fdd3c 100644
--- a/src/compiler/code_generator.ts
+++ b/src/compiler/code_generator.ts
@@ -628,23 +628,25 @@ export class CodeGenerator {
       } = ast.model;
 
       const baseExpression = compileExpr(baseExpr);
-      const id = this.generateId();
-      this.addLine(`const bExpr${id} = ${baseExpression};`);
+      const bExprId = this.generateId("bExpr");
+      this.addLine(`const ${bExprId} = ${baseExpression};`);
 
       const expression = compileExpr(expr);
+      const exprId = this.generateId("expr");
+      this.addLine(`const ${exprId} = ${expression};`);
+
+      const fullExpression = `${bExprId}[${exprId}]`;
 
       let idx: number;
       if (specialInitTargetAttr) {
-        idx = block!.insertData(
-          `${baseExpression}[${expression}] === '${attrs[targetAttr]}'`,
-          "attr"
-        );
+        idx = block!.insertData(`${fullExpression} === '${attrs[targetAttr]}'`, "attr");
         attrs[`block-attribute-${idx}`] = specialInitTargetAttr;
       } else if (hasDynamicChildren) {
-        tModelSelectedExpr = `bValue${id}`;
-        this.addLine(`let ${tModelSelectedExpr} = ${baseExpression}[${expression}]`);
+        const bValueId = this.generateId("bValue");
+        tModelSelectedExpr = `${bValueId}`;
+        this.addLine(`let ${tModelSelectedExpr} = ${fullExpression}`);
       } else {
-        idx = block!.insertData(`${baseExpression}[${expression}]`, "attr");
+        idx = block!.insertData(`${fullExpression}`, "attr");
         attrs[`block-attribute-${idx}`] = targetAttr;
       }
       this.helpers.add("toNumber");
@@ -652,7 +654,7 @@ export class CodeGenerator {
       valueCode = shouldTrim ? `${valueCode}.trim()` : valueCode;
       valueCode = shouldNumberize ? `toNumber(${valueCode})` : valueCode;
 
-      const handler = `[(ev) => { bExpr${id}[${expression}] = ${valueCode}; }]`;
+      const handler = `[(ev) => { ${fullExpression} = ${valueCode}; }]`;
       idx = block!.insertData(handler, "hdlr");
       attrs[`block-handler-${idx}`] = eventType;
     }
diff --git a/tests/components/__snapshots__/t_model.test.ts.snap b/tests/components/__snapshots__/t_model.test.ts.snap
index a97cad08..7ab33d0d 100644
--- a/tests/components/__snapshots__/t_model.test.ts.snap
+++ b/tests/components/__snapshots__/t_model.test.ts.snap
@@ -10,8 +10,9 @@ exports[`t-model directive .lazy modifier 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['text'];
-    let hdlr1 = [(ev) => { bExpr1['text'] = ev.target.value; }];
+    const expr1 = 'text';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let txt1 = ctx['state'].text;
     return block1([attr1, hdlr1, txt1]);
   }
@@ -28,8 +29,9 @@ exports[`t-model directive .number modifier 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['number'];
-    let hdlr1 = [(ev) => { bExpr1['number'] = toNumber(ev.target.value); }];
+    const expr1 = 'number';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = toNumber(ev.target.value); }];
     let txt1 = ctx['state'].number;
     return block1([attr1, hdlr1, txt1]);
   }
@@ -46,8 +48,9 @@ exports[`t-model directive .trim modifier 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['text'];
-    let hdlr1 = [(ev) => { bExpr1['text'] = ev.target.value.trim(); }];
+    const expr1 = 'text';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value.trim(); }];
     let txt1 = ctx['state'].text;
     return block1([attr1, hdlr1, txt1]);
   }
@@ -64,8 +67,9 @@ exports[`t-model directive basic use, on an input 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['text'];
-    let hdlr1 = [(ev) => { bExpr1['text'] = ev.target.value; }];
+    const expr1 = 'text';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let txt1 = ctx['state'].text;
     return block1([attr1, hdlr1, txt1]);
   }
@@ -82,8 +86,9 @@ exports[`t-model directive basic use, on an input with bracket expression 1`] =
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['text'];
-    let hdlr1 = [(ev) => { bExpr1['text'] = ev.target.value; }];
+    const expr1 = 'text';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let txt1 = ctx['state'].text;
     return block1([attr1, hdlr1, txt1]);
   }
@@ -100,8 +105,9 @@ exports[`t-model directive basic use, on another key in component 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['some'];
-    let attr1 = ctx['some']['text'];
-    let hdlr1 = [(ev) => { bExpr1['text'] = ev.target.value; }];
+    const expr1 = 'text';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let txt1 = ctx['some'].text;
     return block1([attr1, hdlr1, txt1]);
   }
@@ -119,8 +125,9 @@ exports[`t-model directive can also define t-on directive on same event, part 1
   return function template(ctx, node, key = \\"\\") {
     let hdlr1 = [ctx['onInput'], ctx];
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['text'];
-    let hdlr2 = [(ev) => { bExpr1['text'] = ev.target.value; }];
+    const expr1 = 'text';
+    let attr1 = bExpr1[expr1];
+    let hdlr2 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     return block1([hdlr1, attr1, hdlr2]);
   }
 }"
@@ -137,16 +144,19 @@ exports[`t-model directive can also define t-on directive on same event, part 2
   return function template(ctx, node, key = \\"\\") {
     let hdlr1 = [ctx['onClick'], ctx];
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['choice'] === 'One';
-    let hdlr2 = [(ev) => { bExpr1['choice'] = ev.target.value; }];
+    const expr1 = 'choice';
+    let attr1 = bExpr1[expr1] === 'One';
+    let hdlr2 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let hdlr3 = [ctx['onClick'], ctx];
     const bExpr2 = ctx['state'];
-    let attr2 = ctx['state']['choice'] === 'Two';
-    let hdlr4 = [(ev) => { bExpr2['choice'] = ev.target.value; }];
+    const expr2 = 'choice';
+    let attr2 = bExpr2[expr2] === 'Two';
+    let hdlr4 = [(ev) => { bExpr2[expr2] = ev.target.value; }];
     let hdlr5 = [ctx['onClick'], ctx];
     const bExpr3 = ctx['state'];
-    let attr3 = ctx['state']['choice'] === 'Three';
-    let hdlr6 = [(ev) => { bExpr3['choice'] = ev.target.value; }];
+    const expr3 = 'choice';
+    let attr3 = bExpr3[expr3] === 'Three';
+    let hdlr6 = [(ev) => { bExpr3[expr3] = ev.target.value; }];
     return block1([hdlr1, attr1, hdlr2, hdlr3, attr2, hdlr4, hdlr5, attr3, hdlr6]);
   }
 }"
@@ -165,8 +175,9 @@ exports[`t-model directive following a scope protecting directive (e.g. t-set) 1
     ctx[isBoundary] = 1
     setContextValue(ctx, \\"admiral\\", 'Bruno');
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['text'];
-    let hdlr1 = [(ev) => { bExpr1['text'] = ev.target.value; }];
+    const expr1 = 'text';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     return block1([attr1, hdlr1]);
   }
 }"
@@ -188,8 +199,9 @@ exports[`t-model directive in a t-foreach 1`] = `
       ctx[\`thing\`] = v_block2[i1];
       let key1 = ctx['thing'].id;
       const bExpr1 = ctx['thing'];
-      let attr1 = ctx['thing']['f'];
-      let hdlr1 = [(ev) => { bExpr1['f'] = ev.target.checked; }];
+      const expr1 = 'f';
+      let attr1 = bExpr1[expr1];
+      let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.checked; }];
       c_block2[i1] = withKey(block3([attr1, hdlr1]), key1);
     }
     let b2 = list(c_block2);
@@ -215,8 +227,37 @@ exports[`t-model directive in a t-foreach, part 2 1`] = `
       ctx[\`thing_index\`] = i1;
       let key1 = ctx['thing_index'];
       const bExpr1 = ctx['state'];
-      let attr1 = ctx['state'][ctx['thing_index']];
-      let hdlr1 = [(ev) => { bExpr1[ctx['thing_index']] = ev.target.value; }];
+      const expr1 = ctx['thing_index'];
+      let attr1 = bExpr1[expr1];
+      let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
+      c_block2[i1] = withKey(block3([attr1, hdlr1]), key1);
+    }
+    let b2 = list(c_block2);
+    return block1([], [b2]);
+  }
+}"
+`;
+
+exports[`t-model directive in a t-foreach, part 3 1`] = `
+"function anonymous(bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
+  let { prepareList, toNumber, withKey } = helpers;
+  
+  let block1 = createBlock(\`<div><block-child-0/></div>\`);
+  let block3 = createBlock(\`<input block-attribute-0=\\"value\\" block-handler-1=\\"input\\"/>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    ctx = Object.create(ctx);
+    const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['names']);
+    for (let i1 = 0; i1 < l_block2; i1++) {
+      ctx[\`name\`] = v_block2[i1];
+      ctx[\`name_index\`] = i1;
+      let key1 = ctx['name_index'];
+      const bExpr1 = ctx['state'].values;
+      const expr1 = ctx['name'];
+      let attr1 = bExpr1[expr1];
+      let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
       c_block2[i1] = withKey(block3([attr1, hdlr1]), key1);
     }
     let b2 = list(c_block2);
@@ -235,8 +276,9 @@ exports[`t-model directive on a select 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['color'];
-    let hdlr1 = [(ev) => { bExpr1['color'] = ev.target.value; }];
+    const expr1 = 'color';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let txt1 = ctx['state'].color;
     return block1([attr1, hdlr1, txt1]);
   }
@@ -253,8 +295,9 @@ exports[`t-model directive on a select, initial state 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['color'];
-    let hdlr1 = [(ev) => { bExpr1['color'] = ev.target.value; }];
+    const expr1 = 'color';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     return block1([attr1, hdlr1]);
   }
 }"
@@ -270,8 +313,9 @@ exports[`t-model directive on a sub state key 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'].something;
-    let attr1 = ctx['state'].something['text'];
-    let hdlr1 = [(ev) => { bExpr1['text'] = ev.target.value; }];
+    const expr1 = 'text';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let txt1 = ctx['state'].something.text;
     return block1([attr1, hdlr1, txt1]);
   }
@@ -288,11 +332,13 @@ exports[`t-model directive on an input type=radio 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['choice'] === 'One';
-    let hdlr1 = [(ev) => { bExpr1['choice'] = ev.target.value; }];
+    const expr1 = 'choice';
+    let attr1 = bExpr1[expr1] === 'One';
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     const bExpr2 = ctx['state'];
-    let attr2 = ctx['state']['choice'] === 'Two';
-    let hdlr2 = [(ev) => { bExpr2['choice'] = ev.target.value; }];
+    const expr2 = 'choice';
+    let attr2 = bExpr2[expr2] === 'Two';
+    let hdlr2 = [(ev) => { bExpr2[expr2] = ev.target.value; }];
     let txt1 = ctx['state'].choice;
     return block1([attr1, hdlr1, attr2, hdlr2, txt1]);
   }
@@ -309,11 +355,13 @@ exports[`t-model directive on an input type=radio, with initial value 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['choice'] === 'One';
-    let hdlr1 = [(ev) => { bExpr1['choice'] = ev.target.value; }];
+    const expr1 = 'choice';
+    let attr1 = bExpr1[expr1] === 'One';
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     const bExpr2 = ctx['state'];
-    let attr2 = ctx['state']['choice'] === 'Two';
-    let hdlr2 = [(ev) => { bExpr2['choice'] = ev.target.value; }];
+    const expr2 = 'choice';
+    let attr2 = bExpr2[expr2] === 'Two';
+    let hdlr2 = [(ev) => { bExpr2[expr2] = ev.target.value; }];
     return block1([attr1, hdlr1, attr2, hdlr2]);
   }
 }"
@@ -330,8 +378,9 @@ exports[`t-model directive on an input, type=checkbox 1`] = `
   return function template(ctx, node, key = \\"\\") {
     let b2,b3;
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['flag'];
-    let hdlr1 = [(ev) => { bExpr1['flag'] = ev.target.checked; }];
+    const expr1 = 'flag';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.checked; }];
     if (ctx['state'].flag) {
       b2 = text(\`yes\`);
     } else {
@@ -352,8 +401,9 @@ exports[`t-model directive on an textarea 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['text'];
-    let hdlr1 = [(ev) => { bExpr1['text'] = ev.target.value; }];
+    const expr1 = 'text';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let txt1 = ctx['state'].text;
     return block1([attr1, hdlr1, txt1]);
   }
@@ -370,8 +420,9 @@ exports[`t-model directive t-model on select with static options 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let attr1 = ctx['state']['model'];
-    let hdlr1 = [(ev) => { bExpr1['model'] = ev.target.value; }];
+    const expr1 = 'model';
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let txt1 = 'a';
     let txt2 = 'b';
     let txt3 = 'c';
@@ -390,8 +441,9 @@ exports[`t-model directive t-model with dynamic values on select options -- 2 1`
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let bValue1 = ctx['state']['model']
-    let hdlr1 = [(ev) => { bExpr1['model'] = ev.target.value; }];
+    const expr1 = 'model';
+    let bValue1 = bExpr1[expr1]
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let attr1 = ctx['options'][0];
     let attr2 = bValue1 === ctx['options'][0];
     let txt1 = ctx['options'][0];
@@ -413,8 +465,9 @@ exports[`t-model directive t-model with dynamic values on select options -- 3 1`
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let bValue1 = ctx['state']['model']
-    let hdlr1 = [(ev) => { bExpr1['model'] = ev.target.value; }];
+    const expr1 = 'model';
+    let bValue1 = bExpr1[expr1]
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let attr1 = ctx['options'][0];
     let attr2 = bValue1 === ctx['options'][0];
     let txt1 = ctx['options'][0];
@@ -435,8 +488,9 @@ exports[`t-model directive t-model with dynamic values on select options 1`] = `
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let bValue1 = ctx['state']['model']
-    let hdlr1 = [(ev) => { bExpr1['model'] = ev.target.value; }];
+    const expr1 = 'model';
+    let bValue1 = bExpr1[expr1]
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     let attr1 = ctx['options'][0];
     let attr2 = bValue1 === ctx['options'][0];
     let txt1 = ctx['options'][0];
@@ -459,8 +513,9 @@ exports[`t-model directive t-model with dynamic values on select options in fore
   
   return function template(ctx, node, key = \\"\\") {
     const bExpr1 = ctx['state'];
-    let bValue1 = ctx['state']['model']
-    let hdlr1 = [(ev) => { bExpr1['model'] = ev.target.value; }];
+    const expr1 = 'model';
+    let bValue1 = bExpr1[expr1]
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
     ctx = Object.create(ctx);
     const [k_block2, v_block2, l_block2, c_block2] = prepareList(ctx['options']);
     for (let i1 = 0; i1 < l_block2; i1++) {
@@ -491,17 +546,38 @@ exports[`t-model directive two inputs in a div alternating with a t-if 1`] = `
     let b2,b3;
     if (ctx['state'].flag) {
       const bExpr1 = ctx['state'];
-      let attr1 = ctx['state']['text1'];
-      let hdlr1 = [(ev) => { bExpr1['text1'] = ev.target.value; }];
+      const expr1 = 'text1';
+      let attr1 = bExpr1[expr1];
+      let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
       b2 = block2([attr1, hdlr1]);
     }
     if (!ctx['state'].flag) {
       const bExpr2 = ctx['state'];
-      let attr2 = ctx['state']['text2'];
-      let hdlr2 = [(ev) => { bExpr2['text2'] = ev.target.value; }];
+      const expr2 = 'text2';
+      let attr2 = bExpr2[expr2];
+      let hdlr2 = [(ev) => { bExpr2[expr2] = ev.target.value; }];
       b3 = block3([attr2, hdlr2]);
     }
     return block1([], [b2, b3]);
   }
 }"
 `;
+
+exports[`t-model directive with expression having a changing key 1`] = `
+"function anonymous(bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
+  let { toNumber } = helpers;
+  
+  let block1 = createBlock(\`<div><input block-attribute-0=\\"value\\" block-handler-1=\\"input\\"/><span><block-text-2/></span></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    const bExpr1 = ctx['state'].something;
+    const expr1 = ctx['text'].key;
+    let attr1 = bExpr1[expr1];
+    let hdlr1 = [(ev) => { bExpr1[expr1] = ev.target.value; }];
+    let txt1 = ctx['state'].something[ctx['text'].key];
+    return block1([attr1, hdlr1, txt1]);
+  }
+}"
+`;
diff --git a/tests/components/t_model.test.ts b/tests/components/t_model.test.ts
index 92db243f..04422a7a 100644
--- a/tests/components/t_model.test.ts
+++ b/tests/components/t_model.test.ts
@@ -246,6 +246,34 @@ describe("t-model directive", () => {
     expect(fixture.innerHTML).toBe("<div><input><span>test</span></div>");
   });
 
+  test("with expression having a changing key", async () => {
+    class SomeComponent extends Component {
+      static template = xml`
+        <div>
+          <input t-model="state.something[text.key]"/>
+          <span><t t-esc="state.something[text.key]"/></span>
+        </div>
+      `;
+      state: { something: { [key: string]: string } } = useState({ something: {} });
+      text = useState({ key: "foo" });
+    }
+    const comp = await mount(SomeComponent, fixture);
+
+    expect(fixture.innerHTML).toBe("<div><input><span></span></div>");
+
+    let input = fixture.querySelector("input")!;
+    await editInput(input, "footest");
+    expect(comp.state.something[comp.text.key]).toBe("footest");
+    expect(fixture.innerHTML).toBe("<div><input><span>footest</span></div>");
+
+    comp.text.key = "bar";
+    await nextTick();
+    input = fixture.querySelector("input")!;
+    await editInput(input, "test bar");
+    expect(comp.state.something[comp.text.key]).toBe("test bar");
+    expect(fixture.innerHTML).toBe("<div><input><span>test bar</span></div>");
+  });
+
   test(".lazy modifier", async () => {
     class SomeComponent extends Component {
       static template = xml`
@@ -360,6 +388,26 @@ describe("t-model directive", () => {
     expect(comp.state).toEqual(["zuko", "uncle iroh"]);
   });
 
+  test("in a t-foreach, part 3", async () => {
+    class SomeComponent extends Component {
+      static template = xml`
+        <div>
+          <t t-foreach="names" t-as="name" t-key="name_index">
+            <input t-model="state.values[name]"/>
+          </t>
+        </div>
+      `;
+      names = ["Crusher", "Data", "Riker", "Worf"];
+      state = useState({ values: {} });
+    }
+    const comp = await mount(SomeComponent, fixture);
+    expect(comp.state).toEqual({ values: {} });
+
+    const input = fixture.querySelectorAll("input")[1]!;
+    await editInput(input, "Commander");
+    expect(comp.state).toEqual({ values: { Data: "Commander" } });
+  });
+
   test("two inputs in a div alternating with a t-if", async () => {
     class SomeComponent extends Component {
       static template = xml`