Filtered Selection Box by Another Selection ?

[mecjos]

I want to filter a selection box options list by selecting another select box option? here it’s my cutomers select box;

<q-select :options="filteredCustomers" option-label="name" option-value="id" v-model="macFilter.customers"
                                  label="Müşteri" style="width: 200px" multiple emit-value map-options clearable dense
                                  options-dense @clear="clearCustomerSelection" hide-selected use-input @filter="filterCustomer"
                                  input-debounce="0" @input="updateProjectList">
                          <template v-slot:option="scope">
                            <q-item dense v-on="scope.itemEvents" v-bind="scope.itemProps">
                              <q-item-section side><q-checkbox v-model="macFilter.customers" :val="scope.opt.id" /></q-item-section>
                              <q-item-section><q-item-label v-html="scope.opt.name"></q-item-label></q-item-section>
                            </q-item>
                          </template>
                        </q-select>

and this is my projects select box ;

<q-select :options="filteredProjects" option-label="name" option-value="id" v-model="macFilter.projects"
                                  label="Proje" style="width: 200px" multiple emit-value map-options clearable dense
                                  options-dense @clear="clearProjectSelection" hide-selected use-input @filter="filterProject"
                                  input-debounce="0">
                        </q-select>

I want to filter projects options list according to selected customer… I call updateProjectList function in cutomers select box with @input event;

updateProjectList (val) {
      console.log(val)
      if (val) {
        this.filteredProjects = this.projects.filter(project => val.every(id => id === project.customer_id));
        console.log(this.filteredProjects)
      }
    }

It’s expected that filter projects list but it doesn’t work…

filteredProjects data property is updating but nothing happens in project selection list… Where is my mistake?