| Commit message (Collapse) | Author | Age | Files | Lines |
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* Clarify what the situation is and what to do.
* Advise loading schema using `rake db:setup` instead of migrating.
* Use a rescue in the initializer rather than extending the error
message in-place.
* Preserve the original backtrace of other errors by using `raise`
rather than raising again with `raise error`.
References 0ec45cd15d0a2f5aebc75e23d841b6c12f3ba763
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Currently if you attempt to use a database that does not exist you get an error:
```
PG::ConnectionBad FATAL: database "db_error" does not exist
```
The solution is easy, create and migrate your database however new developers may not know these commands by memory. Instead of requiring the developer to search for a solution, tell them how to fix the problem in the error message:
```
ActiveRecord::NoDatabase: FATAL: database "db_error" does not exist
Run `$ bin/rake db:create db:migrate` to create your database
```
Active Record should not know about `rake db:migrate` so this additional information needs to come from the railtie. Potential alternative implementation suggestions are welcome.
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Rather than raising ThrowResult when construct_limited_ids_conditions comes up empty, set the relation to NullRelation and rely on its results.
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up empty, set the relation to NullRelation and rely on its results.
This will help avoid errors like 2fcafee250ee2, because in most cases NullRelation will do the right thing. Minor bonus is avoiding the use of exceptions for flow control.
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begin
Topic.new("hello" => "world")
rescue ActiveRecord::UnknownAttributeError => e
e.record # => #<Topic ... >
e.attribute # => "hello"
end
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If your database supports setting the isolation level for a transaction,
you can set it like so:
Post.transaction(isolation: :serializable) do
# ...
end
Valid isolation levels are:
* `:read_uncommitted`
* `:read_committed`
* `:repeatable_read`
* `:serializable`
You should consult the documentation for your database to understand the
semantics of these different levels:
* http://www.postgresql.org/docs/9.1/static/transaction-iso.html
* https://dev.mysql.com/doc/refman/5.0/en/set-transaction.html
An `ActiveRecord::TransactionIsolationError` will be raised if:
* The adapter does not support setting the isolation level
* You are joining an existing open transaction
* You are creating a nested (savepoint) transaction
The mysql, mysql2 and postgresql adapters support setting the
transaction isolation level. However, support is disabled for mysql
versions below 5, because they are affected by a bug
(http://bugs.mysql.com/bug.php?id=39170) which means the isolation level
gets persisted outside the transaction.
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SQLite3 driver to correctly generate a time column instead of datetime
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An association between two models cannot be made if a relevant key is
unknown, so fail fast rather than generating invalid SQL. Fixes #3207.
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This reverts commit ee2be435b1e5c0e94a4ee93a1a310e0471a77d07.
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If we don't have a primary key when we ask for it, it's better to fail
fast. Fixes GH #2307.
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's/[ \t]*$//' -i {} \;)
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add lazy_load_hooks.rb, which allows us to declare code that
should be run at some later time. For instance, this allows
us to defer requiring ActiveRecord::Base at boot time purely
to apply configuration. Instead, we register a hook that should
apply configuration once ActiveRecord::Base is loaded.
With these changes, brings down total boot time of a
new app to 300ms in production and 400ms in dev.
TODO: rename base_hook
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