Fabo/improve delegations (#455)

* improve delegations

* removed timer

* add hack for accounts with no nominations

Co-authored-by: Bitcoinera <anagjordano@gmail.com>

lib/source/polkadotV0-source.js

@@ -213,19 +213,29 @@ class polkadotAPI {
     delegatorAddress,
     validatorsDictionary
   ) {
-    const validatorsArray = Object.keys(validatorsDictionary).map(
-      key => validatorsDictionary[key]
+    const api = await this.getAPI()
+    const nominations = JSON.parse(
+      JSON.stringify(await api.query.staking.nominators(delegatorAddress))
+    )
+    if (!nominations) return [] // HACK not all accounts do have nominations
+    const allNominations = nominations.reduce(
+      (all, { targets }) => all.concat(targets),
+      []
     )
-    let delegations = []
-    validatorsArray.forEach(validator => {
-      validator.nominations.forEach(nomination => {
-        if (delegatorAddress === nomination.who) {
-          delegations.push(
-            this.reducers.delegationReducer(this.network, nomination, validator)
-          )
-        }
+    let delegations = allNominations
+      .map(validatorAddress => {
+        const validator = validatorsDictionary[validatorAddress]
+        if (!validator) return undefined // HACK until we load all validators
+        const nomination = validator
+          ? validator.nominations.find(({ who }) => who === delegatorAddress)
+          : undefined
+        return this.reducers.delegationReducer(
+          this.network,
+          nomination,
+          validator
+        )
       })
-    })
+      .filter(x => !!x) //filter out not existing validators
     return delegations
   }
 }