add abi model

app/models/abi.rb

@@ -0,0 +1,3 @@
+class Abi < ApplicationRecord
+  validates :address, presence: true
+end

db/migrate/20180705032658_create_abis.rb

@@ -0,0 +1,11 @@
+class CreateAbis < ActiveRecord::Migration[5.2]
+  def change
+    create_table :abis do |t|
+      t.string :address
+      t.integer :block_number
+      t.text :value
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,11 +10,19 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_07_04_092420) do
+ActiveRecord::Schema.define(version: 2018_07_05_032658) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
+  create_table "abis", force: :cascade do |t|
+    t.string "address"
+    t.integer "block_number"
+    t.text "value"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "balances", force: :cascade do |t|
     t.string "address"
     t.integer "height"

test/models/abi_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class AbiTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end