| Commit message (Collapse) | Author | Age | Files | Lines |
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I originally named this `StatementInvalid` because that's what we do in
GitHub, but `@tenderlove` pointed out that this means apps can't test
for or explitly rescue this error. `StatementInvalid` is pretty broad so
I've renamed this to `ReadOnlyError`.
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This PR adds the ability to prevent writes to a database even if the
database user is able to write (ie the database is a primary and not a
replica).
This is useful for a few reasons: 1) when converting your database from
a single db to a primary/replica setup - you can fix all the writes on
reads early on, 2) when we implement automatic database switching or
when an app is manually switching connections this feature can be used
to ensure reads are reading and writes are writing. We want to make sure
we raise if we ever try to write in read mode, regardless of database
type and 3) for local development if you don't want to set up multiple
databases but do want to support rw/ro queries.
This should be used in conjunction with `connected_to` in write mode.
For example:
```
ActiveRecord::Base.connected_to(role: :writing) do
Dog.connection.while_preventing_writes do
Dog.create! # will raise because we're preventing writes
end
end
ActiveRecord::Base.connected_to(role: :reading) do
Dog.connection.while_preventing_writes do
Dog.first # will not raise because we're not writing
end
end
```
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Prevent `ActiveRecord::FinderMethods#limited_ids_for` from using correct primary
key values even if `ORDER BY` columns include other table's primary key.
Fixes #28364.
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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`valid_type?` is used in schema dumper to determine if a type is
supported. So if `valid_type?(:foobar)` is true, it means that schema
dumper is allowed to create `t.foobar`. But it doesn't work. I think
that `valid_type?` should accept only supported types.
https://github.com/rails/rails/blob/v5.1.0.beta1/activerecord/lib/active_record/schema_dumper.rb#L135-L142
```ruby
columns.each do |column|
raise StandardError, "Unknown type '#{column.sql_type}' for column '#{column.name}'" unless @connection.valid_type?(column.type)
next if column.name == pk
type, colspec = @connection.column_spec(column)
tbl.print " t.#{type} #{column.name.inspect}"
tbl.print ", #{format_colspec(colspec)}" if colspec.present?
tbl.puts
end
```
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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in the case of sqlite.
Others adapters need to perform a check for validity.
Add coverage for mysql2 db type validation
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Currently `exec_query` raises `NoMethodError` when executing no result
queries (`INSERT`, `UPDATE`, `DELETE`, and all DDL) in mysql2 adapter.
```
irb(main):002:0> conn.execute("create table t(a int)")
(43.3ms) create table t(a int)
=> nil
irb(main):003:0> conn.execute("insert into t values (1)")
(19.3ms) insert into t values (1)
=> nil
irb(main):004:0> conn.exec_query("insert into t values (1)")
SQL (28.6ms) insert into t values (1)
NoMethodError: undefined method `fields' for nil:NilClass
```
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In MySQL 5.7.5 and up, ONLY_FULL_GROUP_BY affects handling of queries
that use DISTINCT and ORDER BY. It requires the ORDER BY columns in the
select list for distinct queries, and requires that the ORDER BY include
the distinct column.
See https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html
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