Strapi email designer plugin reference template to record

I'm currently developing a multi-tenant API with Strapi and for one of the parts I use the Strapi email designer plugin because I want to send some emails but I want them to be custom designed for each tenant, the problem is that the plugin's table is not accessible in the content manager of Strapi so I can only hard code the template to a specific endpoint, is there a way to have the plugin table in the content manager or for it to be referenced to a content manager table something like:

(table)tenant->(field)templateId => (ref-table)plugin-email-designer->(ref-field)templateId

you know so I can switch and set dynamically from the Strapi panel and not with hard-coded endpoints

I've checked your issue briefly, and there is option you are going to like, but it involves using patch-package...

So, let's assume that you have strapi project created and you have added strapi-plugin-email-designer and you are using yarn v1.xx.xx:

yarn add patch-package postinstall-postinstall

Go to node_modules/strapi-plugin-email-designer/server/content-types/email-template/schema.json change following fileds:

{
 ...
 "pluginOptions": {
    "content-manager": {
      "visible": true
    },
    "content-type-builder": {
      "visible": true
    }
  },
  ...
}

now run

yarn patch-package strapi-plugin-email-designer

now open your projects package.json and add to scripts:

{
  "scripts": {
    ...
    "postinstall": "patch-package"
  }
}

run

yarn build
yarn develop

head to admin ui, you should see new Collection:

so now you can do that:

Sending Email

Let's assume you added a relation has one called email_template to your model.

Next we need to add custom route, so in /src/api/tenant/routes/ create file called routes.js

/src/api/tenant/routes/routes.js

module.exports = {
  routes: [
    {
      method: 'POST',
      path: `/tenants/:id/send`,
      handler: `tenant.send`
    }
  ]
}

now, we need to add handler to controller:

/src/api/tenant/controllers/tenant.js

"use strict";

/**
 * tenant controller
 */

const { createCoreController } = require("@strapi/strapi").factories;
module.exports = createCoreController("api::tenant.tenant", ({ strapi }) => ({
  async send(ctx) {
    const { id } = ctx.params;
    const { data } = ctx.request.body;
    // notice, if you need extra validation you add it here
    // if (!data) return ctx.badRequest("no data was provided");
    const { to, subject } = data;

    const { email_template, ...tenant } = await strapi.db
      .query("api::tenant.tenant")
      // if you have extra relations it's better to populate them directly here
      .findOne({ where: { id }, populate: ["email_template"] });

    console.log(email_template);

    try {
      await strapi
        .plugin("email-designer")
        .service("email")
        .sendTemplatedEmail(
          {
            to,
            //from, < should be set in /config/plugins.js email.settings.defaultFrom
            //replayTo < should be set in /config/plugins.js email.settings.defaultReplyTo
          },
          {
            templateReferenceId: email_template.templateReferenceId,
            subject,
          },
          {
            ...tenant,
            // this equals to apply all the data you have in tenant
            // this may need to be aligned between your tenant and template
          }
        );
      return { success: `Message sent to ${to}` };
    } catch (e) {
      strapi.log.debug("📺: ", e);
      return ctx.badRequest(null, e);
    }
  },
}));

don't forget to enable access to /api/tenants/:id/send in admin panel, Settings - Roles

POST http://localhost:1337/api/tenants/1/send

{
    "data": {
        "to" : "email@example.com",
        "subject": "Hello World"
    }
}

response:

{
    "success": "Message sent to email@example.com"
}

pls note, there is no template validation, e.g. if you give it a wrong template it would not be happy