質問編集履歴
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詳細手順を追加しました
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### 詳細な手順
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1. `branch_a` で `rails g migration` を実行し、 `rake db:migrate` で、 DBへ反映
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```
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$ git branch
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* branch_a
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branch_b
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master
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$ rails g model user name:string
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invoke active_record
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create db/migrate/20170119014258_create_users.rb
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create app/models/user.rb
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invoke test_unit
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create test/models/user_test.rb
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create test/fixtures/users.yml
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$ rake db:migrate
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== 20170119014258 CreateUsers: migrating ======================================
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-- create_table(:users)
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-> 0.0481s
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== 20170119014258 CreateUsers: migrated (0.0482s) =============================
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$ git status
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On branch branch_a
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Changes not staged for commit:
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(use "git add <file>..." to update what will be committed)
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(use "git checkout -- <file>..." to discard changes in working directory)
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modified: db/schema.rb
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Untracked files:
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(use "git add <file>..." to include in what will be committed)
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app/models/user.rb
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db/migrate/20170119014258_create_users.rb
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test/fixtures/users.yml
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test/models/user_test.rb
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$ git add .
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$ git commit -m "add user model"
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```
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2.`git checkout branch_b` で `branch_b` に切り替え、 `rake db:migrate` を行う
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```
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$ git checkout -b branch_b
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$ git branch
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branch_a
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* branch_b
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master
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$ rake db:migrate #←ここでdiffが発生する
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$ git diff
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diff --git a/db/schema.rb b/db/schema.rb
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index 305532e..1c0d0dc 100644
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--- a/db/schema.rb
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+++ b/db/schema.rb
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@@ -10,7 +10,7 @@
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#
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# It's strongly recommended that you check this file into your version control system.
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-ActiveRecord::Schema.define(version: 20161230062212) do
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+ActiveRecord::Schema.define(version: 20170119014258) do
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# These are extensions that must be enabled in order to support this database
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enable_extension "plpgsql"
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@@ -29,4 +29,10 @@ ActiveRecord::Schema.define(version: 20161230062212) do
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t.datetime "updated_at", null: false
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end
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+ create_table "users", force: :cascade do |t|
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+ t.string "name"
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+ t.datetime "created_at", null: false
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+ t.datetime "updated_at", null: false
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+ end
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end
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```
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