Rails HStore issue - TypeError: can't cast Hash
Rails HStore issue - TypeError: can't cast Hash
正在尝试按照 this tutorial 设置 hstore。我已经完成并向用户模型添加了一个 preferences hstore，并且一切正常。现在我已经将 exercises hstore 添加到不同的模型，这就是我得到的：
irb(main):128:0* workout = Workout.new
=> #<Workout id: nil, user_id: nil, created_at: nil, updated_at: nil, exercises: nil>
irb(main):129:0> workout.exercises = {
irb(main):130:1* lunges: "10"
irb(main):131:1> }
=> {:lunges=>"10"}
irb(main):132:0> workout.save!
(0.2ms) begin transaction
(1.5ms) rollback transaction
TypeError: can't cast Hash to
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/quoting.rb:34:in `rescue in type_cast'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/quoting.rb:23:in `type_cast'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:294:in `block in exec_query'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:293:in `map'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:293:in `exec_query'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:76:in `exec_insert'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:108:in `insert'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `insert'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/relation.rb:64:in `insert'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/persistence.rb:521:in `_create_record'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/counter_cache.rb:139:in `_create_record'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/attribute_methods/dirty.rb:127:in `_create_record'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/callbacks.rb:306:in `block in _create_record'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:88:in `call'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:88:in `_run_callbacks'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:734:in `_run_create_callbacks'
... 24 levels...
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/console.rb:9:in `start'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:68:in `console'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
from /Users/nomad/Documents/milonos/bin/rails:8:in `<top (required)>'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `block in load'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
from /usr/local/Cellar/ruby/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /usr/local/Cellar/ruby/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from -e:1:in `<main>'irb(main):133:0>
我创建锻炼模型的迁移是：
class CreateWorkouts < ActiveRecord::Migration
def change
create_table :workouts do |t|
t.references :user, index: true
t.timestamps null: false
end
add_foreign_key :workouts, :users
end
end
以及添加 hstore 的迁移：
class AddExercisesToWorkouts < ActiveRecord::Migration
def change
enable_extension "hstore"
add_column :workouts, :exercises, :hstore
add_index :workouts, :exercises, using: :gist
end
end
还有我的模特：
class Workout < ActiveRecord::Base
belongs_to :user
store_accessor :exercises
end
当执行 user = User.new 并将散列设置添加到 preferences hstore 时，一切似乎都正常。我在这里错过了什么？
我最后做的是安装 postgres 并从 sqlite 切换到它。然后我做了rake db:drop db:create db:migrate db:seed，所有的迁移都通过了。将 databases.yml 更改为：
# PostgreSQL. Versions 8.2 and up are supported.
#
# Install the pg driver:
# gem install pg
# On OS X with Homebrew:
# gem install pg -- --with-pg-config=/usr/local/bin/pg_config
# On OS X with MacPorts:
# gem install pg -- --with-pg-config=/opt/local/lib/postgresql84/bin/pg_config
# On Windows:
# gem install pg
# Choose the win32 build.
# Install PostgreSQL and put its /bin directory on your path.
#
# Configure Using Gemfile
# gem 'pg'
#
development:
adapter: postgresql
encoding: unicode
database: appname_development
pool: 5
username: username
password:
timeout: 5000
# Connect on a TCP socket. Omitted by default since the client uses a
# domain socket that doesn't need configuration. Windows does not have
# domain sockets, so uncomment these lines.
#host: localhost
# The TCP port the server listens on. Defaults to 5432.
# If your server runs on a different port number, change accordingly.
#port: 5432
# Schema search path. The server defaults to $user,public
#schema_search_path: myapp,sharedapp,public
# Minimum log levels, in increasing order:
# debug5, debug4, debug3, debug2, debug1,
# log, notice, warning, error, fatal, and panic
# Defaults to warning.
#min_messages: notice
# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
adapter: postgresql
encoding: unicode
database: appname_test
pool: 5
username: username
password:
timeout: 5000
正在尝试按照 this tutorial 设置 hstore。我已经完成并向用户模型添加了一个 preferences hstore，并且一切正常。现在我已经将 exercises hstore 添加到不同的模型，这就是我得到的：
irb(main):128:0* workout = Workout.new
=> #<Workout id: nil, user_id: nil, created_at: nil, updated_at: nil, exercises: nil>
irb(main):129:0> workout.exercises = {
irb(main):130:1* lunges: "10"
irb(main):131:1> }
=> {:lunges=>"10"}
irb(main):132:0> workout.save!
(0.2ms) begin transaction
(1.5ms) rollback transaction
TypeError: can't cast Hash to
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/quoting.rb:34:in `rescue in type_cast'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/quoting.rb:23:in `type_cast'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:294:in `block in exec_query'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:293:in `map'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:293:in `exec_query'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:76:in `exec_insert'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:108:in `insert'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `insert'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/relation.rb:64:in `insert'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/persistence.rb:521:in `_create_record'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/counter_cache.rb:139:in `_create_record'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/attribute_methods/dirty.rb:127:in `_create_record'
from /usr/local/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/callbacks.rb:306:in `block in _create_record'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:88:in `call'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:88:in `_run_callbacks'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:734:in `_run_create_callbacks'
... 24 levels...
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/console.rb:9:in `start'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:68:in `console'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /usr/local/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
from /Users/nomad/Documents/milonos/bin/rails:8:in `<top (required)>'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `block in load'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
from /usr/local/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
from /usr/local/Cellar/ruby/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /usr/local/Cellar/ruby/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from -e:1:in `<main>'irb(main):133:0>
我创建锻炼模型的迁移是：
class CreateWorkouts < ActiveRecord::Migration
def change
create_table :workouts do |t|
t.references :user, index: true
t.timestamps null: false
end
add_foreign_key :workouts, :users
end
end
以及添加 hstore 的迁移：
class AddExercisesToWorkouts < ActiveRecord::Migration
def change
enable_extension "hstore"
add_column :workouts, :exercises, :hstore
add_index :workouts, :exercises, using: :gist
end
end
还有我的模特：
class Workout < ActiveRecord::Base
belongs_to :user
store_accessor :exercises
end
当执行 user = User.new 并将散列设置添加到 preferences hstore 时，一切似乎都正常。我在这里错过了什么？
我最后做的是安装 postgres 并从 sqlite 切换到它。然后我做了rake db:drop db:create db:migrate db:seed，所有的迁移都通过了。将 databases.yml 更改为：
# PostgreSQL. Versions 8.2 and up are supported.
#
# Install the pg driver:
# gem install pg
# On OS X with Homebrew:
# gem install pg -- --with-pg-config=/usr/local/bin/pg_config
# On OS X with MacPorts:
# gem install pg -- --with-pg-config=/opt/local/lib/postgresql84/bin/pg_config
# On Windows:
# gem install pg
# Choose the win32 build.
# Install PostgreSQL and put its /bin directory on your path.
#
# Configure Using Gemfile
# gem 'pg'
#
development:
adapter: postgresql
encoding: unicode
database: appname_development
pool: 5
username: username
password:
timeout: 5000
# Connect on a TCP socket. Omitted by default since the client uses a
# domain socket that doesn't need configuration. Windows does not have
# domain sockets, so uncomment these lines.
#host: localhost
# The TCP port the server listens on. Defaults to 5432.
# If your server runs on a different port number, change accordingly.
#port: 5432
# Schema search path. The server defaults to $user,public
#schema_search_path: myapp,sharedapp,public
# Minimum log levels, in increasing order:
# debug5, debug4, debug3, debug2, debug1,
# log, notice, warning, error, fatal, and panic
# Defaults to warning.
#min_messages: notice
# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
adapter: postgresql
encoding: unicode
database: appname_test
pool: 5
username: username
password:
timeout: 5000