Ghost/ghost/admin/app/components/modal-members-label-form.js

import ModalComponent from 'ghost-admin/components/modal-base';
import {computed} from '@ember/object';
import {resetQueryParams} from 'ghost-admin/helpers/reset-query-params';
import {inject as service} from '@ember/service';
import {task} from 'ember-concurrency';

export default ModalComponent.extend({
    router: service(),
    notifications: service(),
    model: null,
    showDeleteLabelModal: false,

    confirm() {},
    label: computed.and('model', 'model.label'),

    willDestroyElement() {
        this._super(...arguments);
        this.label.errors.clear();
        this.label.rollbackAttributes();
    },

    actions: {
        toggleDeleteLabelModal() {
            this.label.rollbackAttributes();
            this.set('showDeleteLabelModal', true);
        },
        validate(property) {
            return this.label.validate({property});
        }
    },

    saveTask: task(function* () {
        let label = this.model && this.model.label;
        let availableLabels = (this.model && this.model.labels) || [];
        if (!label) {
            return false;
        }
        try {
            yield label.validate();

            let duplicateLabel = availableLabels.find((existingLabel) => {
                return existingLabel.name.trim().toLowerCase() === label.name.trim().toLowerCase()
                    && existingLabel.slug !== label.slug;
            });

            if (duplicateLabel) {
                label.errors.add('name', 'A label with the same name already exists');
                label.hasValidated.pushObject('name');
                // label.invalidate();

                return false;
            }

            let savedLabel = yield label.save();
            this.notifications.showNotification('Label saved'.htmlSafe());
            this.send('closeModal');
            return savedLabel;
        } catch (error) {
            if (error) {
                this.notifications.showAPIError(error, {key: 'label.save'});
            }
        }
    }),

    deleteLabel: task(function * () {
        let label = this.model && this.model.label;
        if (!label) {
            return false;
        }
        try {
            yield label.destroyRecord();
            let routeName = this.router.currentRouteName;
            this.notifications.showNotification('Label deleted'.htmlSafe());
            this.send('closeModal');
            this.router.transitionTo(routeName, {queryParams: resetQueryParams(routeName)});
        } catch (error) {
            if (error) {
                return this.notifications.showAPIError(error, {key: 'label.delete'});
            }
        }
    })

});