Rails 4.1 Postgres String Arrays: Can't Save After Modifying -

Rails 4.1 Postgres String Arrays: Can't Save After Modifying -

weirdness:

i'm working in rails 4.1 postgres backend. 1 of models has array fields, i'm hoping handled 'pg' gem (0.17.1). migration file , resulting schema can found below.

the field in question string array. below, i've posted migration, resulting schema, , code doesn't seem working (along output when code run in rails console).

i don't have in user model references field.

migration:

add_column :users, :test, :string, :array => true, default: '{}'

schema:

t.string "test", default: [], array: true

here steps i'm using to reproduce in rails console (assuming basic user model has been created hold field):

u = user.first() u.test.push('testvalue') u # => #<user id: 1, name: "dave", passhash: nil, email: nil, created_at: "2014-10-04 10:12:29", updated_at: "2014-10-04 10:12:29", provider: "identity", uid: "1", oauth_token: nil, oauth_expires_at: nil, test: ["testvalue"]> u.save user.find(1).test # => []

so user record seems initialized -- has empty array set field -- , can array operations on it. somehow can't modifications stick.

fyi, able modify , save other fields using same procedure; it's just arrays behaving this.

any ideas?

edit:

u.test.push('newitem')returns new array expect. no sign of going wrong, or error validates_uniqueness_of -- see firing in console? first comment, i've tested using 'update':

u.update(test: [(u.test << 'testvalue')].flatten)

gives me behavior want, seems clumsy. there need alter in model? i'm not sure how i'm doing makes validates_uniqueness_of fire (it's not set in model).

there (at to the lowest degree used be) problem using ruby array operators push or << on activerecord fields. not marked dirty , not updated in database on save. seek this:

u = user.first() u.test_will_change! u.test.push('testvalue') u.save user.find(1).test

attribute_will_change! marks attribute dirty, making sure serialized , saved database on save.

ruby-on-rails arrays pg