Hey Fellow Coders，
我需要你的帮助。
Rails版本：4.2.4 Ruby版本：ruby 2.2.3p173（2015-08-18修订版51636）[x86_64-darwin15]
我正在尝试按照youtube上的本教程制作推文克隆。 --- 链接： https://www.youtube.com/watch?v=4S4Wyndbnn0。
在视频
上标记 7:35 时，一切正常运行命令“rails generate migration add_username_to_users username：string：uniq”。所有相应的文件都显示在Sublime文本的文件树中，但是当我转到schema.rb时
--I can't seem to find the "the add_index users, ["username"], name: "index_users_on_username", unique: true doesn't show. " in the schema.rb directory
以下是文件：
应用程序/分贝/迁移/ add_username_to_users
class AddUsernameToUsers < ActiveRecord::Migration
def change
add_column :users, :username, :string
add_index :users, :username, unique: true
end
end
应用程序/分贝/模式
# encoding: UTF-8
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 20160210202649) do
create_table "users", force: :cascade do |t|
t.string "email", default: "", null: false
t.string "encrypted_password", default: "", null: false
t.string "reset_password_token"
t.datetime "reset_password_sent_at"
t.datetime "remember_created_at"
t.integer "sign_in_count", default: 0, null: false
t.datetime "current_sign_in_at"
t.datetime "last_sign_in_at"
t.string "current_sign_in_ip"
t.string "last_sign_in_ip"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "username"
end
add_index "users", ["email"], name: "index_users_on_email", unique: true
add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
end
这是我在运行rake db：migrate
时得到的== 20160210230711 AddUsernameToUsers: migrating ===============================
-- add_column(:users, :username, :string)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:
SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
ActiveRecord::StatementInvalid: SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
SQLite3::SQLException: duplicate column name: username
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)
Kriss-MBP:TwitterClone krischery$ rake db:migrate --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:migrate
== 20160210230711 AddUsernameToUsers: migrating ===============================
-- add_column(:users, :username, :string)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:
SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `new'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `prepare'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/schema_statements.rb:393:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:453:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:662:in `block in method_missing'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `block in say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:651:in `method_missing'
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:605:in `exec_migration'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:589:in `block (2 levels) in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:588:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:587:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:765:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `block in ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/transactions.rb:220:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:994:in `execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:956:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:820:in `up'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:798:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `call'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:165:in `invoke'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:150:in `invoke_task'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `load'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `<main>'
ActiveRecord::StatementInvalid: SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `new'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `prepare'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/schema_statements.rb:393:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:453:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:662:in `block in method_missing'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `block in say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:651:in `method_missing'
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:605:in `exec_migration'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:589:in `block (2 levels) in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:588:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:587:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:765:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `block in ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/transactions.rb:220:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:994:in `execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:956:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:820:in `up'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:798:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `call'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:165:in `invoke'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:150:in `invoke_task'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `load'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `<main>'
SQLite3::SQLException: duplicate column name: username
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `new'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `prepare'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/schema_statements.rb:393:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:453:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:662:in `block in method_missing'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `block in say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:651:in `method_missing'
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:605:in `exec_migration'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:589:in `block (2 levels) in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:588:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:587:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:765:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `block in ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/transactions.rb:220:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:994:in `execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:956:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:820:in `up'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:798:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `call'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:165:in `invoke'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:150:in `invoke_task'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `load'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `<main>'
Tasks: TOP => db:migrate
Kriss-MBP:TwitterClone krischery$