Rails的ActiveRecord的::移民什么是指数之间的区别:真和add_index? [英] Rails ActiveRecord::Migration what is the difference between index: true and add_index?
问题描述
之间的区别是什么
t.boolean:is_live,索引:真
和
add_index:table_name的,:is_live
如果没有区别,为什么只有 add_index
体现在schema.rb。当我使用指数:真正的
,我不能真正看到指数 schema.rb
。我应该只使用 add_index
方法。
在使用 add_index
的方法,我可以看到在我的schema.rb
add_index表格名,[is_live],名称:index_table_name_on_is_live,使用::blahblah
简而言之:无论做同样的工作。指数:真'只是保存您的附加导线。看看这里<一href="https://github.com/rails/rails/pull/5262#issuecomment-4329571">https://github.com/rails/rails/pull/5262#issuecomment-4329571
What is the difference between
t.boolean :is_live, index: true
and
add_index :table_name, :is_live
If there is no difference, how come only the add_index
is reflected in schema.rb. When I use index: true
, I can't actually see the index in schema.rb
. Should I only use the add_index
method.
When use the add_index
method, I can see this in my schema.rb
add_index "table_name", ["is_live"], name: "index_table_name_on_is_live", using: :blahblah
In short: both do the same job. ìndex: true` just saves you an additional line. Look here https://github.com/rails/rails/pull/5262#issuecomment-4329571
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