migration added to swap lat and lng in db

backend/src/db/migrations/20200206190233-swap_latitude_with_longitude.js

@@ -0,0 +1,54 @@
+import { getDriver } from '../../db/neo4j'
+
+export const description = 'This migration swaps the value stored in Location.lat with the value of Location.lng.'
+
+export async function up(next) {
+  const driver = getDriver()
+  const session = driver.session()
+  const transaction = session.beginTransaction()
+
+  try {
+    // Implement your migration here.
+    await transaction.run(`
+        MATCH (l:Location) WHERE NOT(l.lat IS NULL)
+        WITH l.lng AS longitude, l.lat AS latitude, l AS Location
+        SET Location.lat = longitude, Location.lng = latitude
+    `)
+    await transaction.commit()
+    next()
+  } catch (error) {
+    // eslint-disable-next-line no-console
+    console.log(error)
+    await transaction.rollback()
+    // eslint-disable-next-line no-console
+    console.log('rolled back')
+  } finally {
+    session.close()
+  }
+}
+
+export async function down(next) {
+  const driver = getDriver()
+  const session = driver.session()
+  const transaction = session.beginTransaction()
+
+  try {
+    // Implement your migration here.
+    await transaction.run(
+      `
+        MATCH (l:Location) WHERE NOT(l.lat IS NULL)
+        WITH l.lng AS longitude, l.lat AS latitude, l AS Location
+        SET Location.lat = longitude, Location.lng = latitude      `,
+    )
+    await transaction.commit()
+    next()
+  } catch (error) {
+    // eslint-disable-next-line no-console
+    console.log(error)
+    await transaction.rollback()
+    // eslint-disable-next-line no-console
+    console.log('rolled back')
+  } finally {
+    session.close()
+  }
+}