[英]Rails 4 JSON attribute type not working with Postgres
I forked a repo from someone I'm collaborating with, and I'm just trying to get my development environment up and running. 我与我合作的人分享了一个回购,我只是想让我的开发环境正常运行。 One of the migrations has a
json
attribute and we're using Postgres for both dev and production: 其中一个迁移有一个
json
属性,我们正在使用Postgres进行开发和生产:
class CreateExams < ActiveRecord::Migration
def change
create_table :exams do |t|
t.belongs_to :user
t.json :exam
t.timestamps
end
end
end
development:
adapter: postgresql
database: examgen_development
host: localhost
When I run the rake db:migrate
, I get an error that would lead me to believe that PG doesn't support JSON column types: 当我运行
rake db:migrate
,我收到一个错误,导致我认为PG不支持JSON列类型:
PG::Error: ERROR: type "json" does not exist
But I know Postgres 9.2 supports JSON (ie http://www.postgresql.org/docs/devel/static/datatype-json.html ). 但我知道Postgres 9.2支持JSON(即http://www.postgresql.org/docs/devel/static/datatype-json.html )。
Interestingly, when I check the version of PG I'm using with 'psql' it shows 9.0.4. 有趣的是,当我检查我使用'psql'的PG版本时,它显示9.0.4。 Whereas when I use 'postgres' it shows 9.2.1.
而当我使用'postgres'时,它显示9.2.1。 So I'm not exactly sure what version I'm using and how to go about switching back and forth.
所以我不确定我正在使用什么版本以及如何来回切换。
psql --version
psql (PostgreSQL) 9.0.4
postgres --version
postgres (PostgreSQL) 9.2.1
Does anyone have thoughts as to why I'm getting that Postgres error? 有没有人想到为什么我得到Postgres错误?
OK, so it turns out at one point I had installed postgres via homebrew, and had also done so with Postgres.app at a different time. 好吧,事实证明我曾经通过自制软件安装了postgres,并且在不同的时间也使用了Postgres.app。 I began to realize this by checking the version of 'psql' and 'postgres' and noticed the distinction.
我通过检查'psql'和'postgres'的版本开始意识到这一点,并注意到了区别。
psql --version
psql (PostgreSQL) 9.0.4
postgres --version
postgres (PostgreSQL) 9.2.4
I uninstalled Postgres.app using their documentation here and then using homebrew ensured I was using the most recent version of postgres. 我在这里使用他们的文档卸载了Postgres.app然后使用自制软件确保我使用的是最新版本的postgres。
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