我目前正在尝试将一个Rails 3.2应用程序切换到Rails 4.0。但是,我在使用has_and_belongs_many
模型时遇到了一个问题。
我创建了一个测试应用程序,并在那里遇到了同样的问题。这是我所做的:
创建了两个模型:foo_clip和foo_url
class FooClip < ActiveRecord::Base
has_and_belongs_to_many :foo_urls
attr_accessible :id, :name
end
class FooUrl < ActiveRecord::Base
has_and_belongs_to_many :foo_clips
attr_accessible :url
end
在此之后,我已经更新了迁移文件:
class CreateFooClips < ActiveRecord::Migration
def change
create_table :foo_clips do |t|
t.string :name
t.timestamps
end
end
end
class CreateFooUrls < ActiveRecord::Migration
def change
create_table :foo_urls do |t|
t.string :url
t.timestamps
end
end
end
现在我已经为has_and_belongs_to_many表创建了迁移文件。
class CreateFooClipsFooUrls < ActiveRecord::Migration
def change
create_table :foo_clips_foo_urls do |t|
t.belongs_to :foo_url
t.belongs_to :foo_clip
end
end
end
作为最后一步,我创建了一个用于测试的种子文件:
foourl1 = FooUrl.create!(:url => 'http://www.google.com')
foourl2 = FooUrl.create!(:url => 'http://www.apple.com')
fooclip1 = FooClip.create!(:name => 'TestClip1')
fooclip1.foo_urls << foourl1
fooclip1.foo_urls << foourl2
fooclip1.save
现在我做了以下事情:
rake db:drop
rake db:create
rake db:migrate
rake db:seed
我遇到了这个错误:
PG::UndefinedTable: ERROR: relation "foo_clips_urls" does not exist
LINE 5: WHERE a.attrelid = '"foo_clips_urls"'::regcla...
^
: SELECT a.attname, format_type(a.atttypid, a.atttypmod),
pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
FROM pg_attribute a LEFT JOIN pg_attrdef d
ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attrelid = '"foo_clips_urls"'::regclass
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum
如果我查看Postgres数据库,表名为:foo_clips_foo_urls。
有任何想法为什么会这样?
seed
文件里有任何代码吗? - MurifoX