feat(lucid): add aggregates on relationship

aggregates support have been added to the relationships

Closes #48

src/Lucid/Relations/proxyHandler.js

@@ -11,6 +11,21 @@
 
 const proxyHandler = exports = module.exports = {}
 const _ = require('lodash')
+const queryExecMethods = [
+  'increment',
+  'decrement',
+  'avg',
+  'min',
+  'max',
+  'count',
+  'truncate',
+  'ids',
+  'pair',
+  'pluckFirst',
+  'pluckId',
+  'pick',
+  'pickInverse'
+]
 
 proxyHandler.get = function (target, name) {
   /**
@@ -27,5 +42,16 @@ proxyHandler.get = function (target, name) {
       return this
     }
   }
+
+  /**
+   * Here we called methods on the relationships
+   * to decorate the query chain by chain required
+   * methods.
+   */
+  if (queryExecMethods.indexOf(name) > -1) {
+    target._validateRead()
+    target._decorateRead()
+  }
+
   return target.relatedQuery[name]
 }

test/unit/fixtures/relations.js

@@ -22,6 +22,7 @@ module.exports = {
       knex.schema.createTable('accounts', function (table) {
         table.increments()
         table.integer('supplier_id')
+        table.integer('points').defaultTo(0)
         table.string('name')
         table.timestamps()
         table.timestamp('deleted_at').nullable()
@@ -73,6 +74,7 @@ module.exports = {
         table.increments()
         table.integer('post_id')
         table.string('body')
+        table.integer('likes').defaultTo(0)
         table.timestamps()
         table.timestamp('deleted_at').nullable()
       }),
@@ -85,6 +87,7 @@ module.exports = {
       knex.schema.createTable('courses', function (table) {
         table.increments()
         table.string('title')
+        table.integer('weightage')
         table.timestamps()
         table.timestamp('deleted_at').nullable()
       }),
@@ -113,6 +116,7 @@ module.exports = {
         table.integer('author_id')
         table.string('title')
         table.string('body')
+        table.integer('amount')
         table.timestamps()
         table.timestamp('deleted_at').nullable()
       }),

test/unit/helpers/query.js

@@ -15,6 +15,11 @@ module.exports = {
   },
 
   formatBindings: function (bindings) {
+    if (process.env.DB === 'pg') {
+      return bindings.map((binding) => {
+        return String(binding)
+      })
+    }
     return bindings
   }
 }