clean unused places/tags #107 and unused fields

server/helpers/place.js

@@ -0,0 +1,22 @@
+const Place = require('../api/models/place')
+const Event = require('../api/models/event')
+const Sequelize = require('sequelize')
+const log = require('../log')
+
+module.exports = {
+  // remove places not related to any events
+  async _cleanUnused () {
+    const places = await Place.findAll({
+      include: [{ model: Event, as: 'events', required: false, attributes: [] }],
+      group: ['place.id'],
+      having: Sequelize.where(Sequelize.fn('COUNT', Sequelize.col('events.id')), '=', 0)
+    })
+    if (!places.length) { return }
+    log.debug(`Remove ${places.length} unrelated places`)
+
+    const ids = places.map(p => p.id)
+    await Place.destroy({
+      where: { id: { [Sequelize.Op.in]: ids } }
+    })
+  }
+}

server/helpers/tag.js

@@ -0,0 +1,22 @@
+const Tag = require('../api/models/tag')
+const Event = require('../api/models/event')
+const Sequelize = require('sequelize')
+const log = require('../log')
+
+module.exports = {
+  // remove tags not related to any events
+  async _cleanUnused () {
+    const tags = await Tag.findAll({
+      include: [{ model: Event, as: 'events', required: false, attributes: [], through: { attributes: [] } }],
+      group: ['tag.tag'],
+      having: Sequelize.where(Sequelize.fn('COUNT', Sequelize.col('events.id')), '=', 0)
+    })
+
+    if (!tags.length) { return }
+    log.info(`Remove ${tags.length} unrelated tags`)
+
+    await Tag.destroy({
+      where: { tag: { [Sequelize.Op.in]: tags.map(p => p.tag) } }
+    })
+  }
+}