在rails上的ruby中创建新表 [英] Create new Table in ruby on rails
问题描述
我尝试在rails中创建一个新表。每个例子我发现和悲伤地尝试不工作与我...
所以这是我尝试直到现在:(我使用Ruby版本1.9和Rails版本3.2.13
在终端制作一个新的模型:
rails generate model content content_id:auto-generated,law_id:integer,parent_id:integer,titel:string,text:string ,content:string,url:string
生成以下代码:
>
class CreateContents< ActiveRecord :: Migration
def change
create_table:contents do | t |
t.auto-generated ,:content_id
t.integer,:law_id
t.integer,:parent_id
t.string,:titel
t.string,:text
t.string ,:content
t.string:url
t.timestamps
end
end
end
如果我尝试rake db:migrate我得到以下错误信息:
语法错误,意外的',',expecting keyword_end
t.auto生成,:content_id
^
如果我删除,我收到此错误消息:
语法错误,意外的tSYMBEG,期望关键字_或者{'或'('
t.auto-generated:content_id
^
我的研究也让我以这种方式创建一个表:
class CreateContents < ActiveRecord :: Migration
def change
create_table:contents do | t |
t.auto-generatedcontent_id
t.integerlaw_id
t.integerparent_id
t.stringtitel
t.string text
t.stringcontent
t.stringurl
t.timestamps
end
end
end
如果我尝试使用该示例获取db,则会收到此错误消息:
语法错误,意外的tSTRING_BEG,expecting keyword_do或'{'或'('
t.auto-generatedcontent_id
^
我做错了什么?
自动生成
不是支持的列类型。
支持以下数据库列类型:
:binary
:boolean
:date
: datetime
:decimal
:float
:integer
:primary_key
:string
:text
:time
:timestamp
更多信息 http://guides.rubyonrails.org/migrations.html#supported-types
Rails会创建自动为您编辑列ID,因此只需编辑您的迁移到以下
class CreateContents< ActiveRecord :: Migration
def change
create_table:contents do | t |
t.integerlaw_id
t.integerparent_id
t.stringtitel
t.stringtext
t.stringcontent
t.stringurl
t.timestamps
end
end
end
I try to create a new table in rails. Every example I find and try sadly does not work with me... so that's what I tried till now: (I use Ruby version 1.9 and Rails Version 3.2.13 making a new model in the terminal:
rails generate model content content_id:auto-generated, law_id:integer, parent_id:integer, titel:string, text:string, content:string, url:string
that generated following code:
class CreateContents < ActiveRecord::Migration
def change
create_table :contents do |t|
t.auto-generated, :content_id
t.integer, :law_id
t.integer, :parent_id
t.string, :titel
t.string, :text
t.string, :content
t.string :url
t.timestamps
end
end
end
if I try to rake db:migrate i get the following error message:
syntax error, unexpected ',', expecting keyword_end
t.auto-generated, :content_id
^
if I remove the "," I get this error message:
syntax error, unexpected tSYMBEG, expecting keyword_do or '{' or '('
t.auto-generated :content_id
^
my research got me to also to this way of creating a table:
class CreateContents < ActiveRecord::Migration
def change
create_table :contents do |t|
t.auto-generated "content_id"
t.integer "law_id"
t.integer "parent_id"
t.string "titel"
t.string "text"
t.string "content"
t.string "url"
t.timestamps
end
end
end
if I try to rake the db with that example I get this error message:
syntax error, unexpected tSTRING_BEG, expecting keyword_do or '{' or '('
t.auto-generated "content_id"
^
What do I do wrong?
auto-generated
is not a supported column type.
Active Record supports the following database column types:
:binary
:boolean
:date
:datetime
:decimal
:float
:integer
:primary_key
:string
:text
:time
:timestamp
More info in http://guides.rubyonrails.org/migrations.html#supported-types
Rails will create the column id automatically for you, thus just edit your migration to the following
class CreateContents < ActiveRecord::Migration
def change
create_table :contents do |t|
t.integer "law_id"
t.integer "parent_id"
t.string "titel"
t.string "text"
t.string "content"
t.string "url"
t.timestamps
end
end
end
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