I have a database schema like that
DataMapper.setup :default, "sqlite://#{Dir.pwd}/image.db"
class Image
include DataMapper::Resource
property :id , Serial
property :url , String,unique: true
property :desc , String,unique: true,default: "empty"
end
DataMapper.finalize.auto_upgrade!
Then i have a loop like this
links.each do |link|
puts link
if Image.all(:url=>link).empty? == true
img=Image.create(:url => link)
puts "Cannot save to database "if img.saved? == false
end
end
I want to add a link when it is not already in a database. I run the script and always get cannot save to dabase. What am I doing wrong? Thanks for any help.
Edit: I add to my code
DataMapper::Logger.new($stdout, :debug)
and there was no insert queries only selects.
You declared :desc property to be unique and set default value to "empty" and in your code example you're creating Image without specifying :desc which results in uniqueness validation failure, that's why your images aren't saved. You can either remove unique option from :desc property declaration or make sure to provide unique value for :desc when creating images.
Also, to make your code more verbose so you could see any validation errors try this:
links.each do |link|
image = Image.new(:url => link)
if image.save
puts "Image saved"
else
puts "Failed to save image: #{image.errors.inspect}"
end
end
Please note that to use validation errors you need to require 'dm-validations' gem.
What do you mean you get "cannot save to database"?
You can try something like this and see if it works a bit better:
links.each do |link|
if Image.first(:url => link)
p "image exists"
else
if Image.create(:url => link)
p "Image succesfully saved"
else
p "could not save image"
end
end
end
Related
I recently started using kirbybase in ruby, but I ran into a problem using the if statement with a result set. Here's a semplified code that seems to have this problem:
require 'kirbybase'
db = KirbyBase.new
if db.table_exists?(:database)
db.drop_table(:database)
end
list = db.create_table(:database, :name, :String, :password, :String, :test, :String)
name = 'Test'
password = 'abcde'
list.insert(name, password, nil)
account = list.select { |r| r.name == name}
if account.test.nil?
puts 'right'
else
puts 'wrong'
end
Why does it output "wrong"?
It seems to be strange to answer my own question but I solved the problem: account.test is an array so the correct form of the if statement is:
if account.test[0].nil?
puts 'right'
else
puts 'wrong'
end
I am running Ruby 2.1 and Mongoid 5.0 (no Rails).
I want to track on a before_save callback whether or not an embedded field has changed.
I can use the document.attribute_changed? or document.changed methods to check normal fields, but somehow these don't work on relations (embed_one, has_one, etc).
Is there a way of detecting these changes before saving the document?
My model is something like this
class Company
include Mongoid::Document
include Mongoid::Attributes::Dynamic
field :name, type: String
#...
embeds_one :address, class_name: 'Address', inverse_of: :address
#...
before_save :activate_flags
def activate_flags
if self.changes.include? 'address'
#self.changes never includes "address"
end
if self.address_changed?
#This throws an exception
end
end
One example of how I save my document is:
#...
company.address = AddressUtilities.parse address
company.save
#After this, the callback is triggered, but self.changes is empty...
#...
I have read the documentation and Google the hell out of it, but I can't find a solution?
I have found this gem, but it's old and doesn't work with the newer versions of Mongoid. I want to check if there is another way of doing it before considering on trying to fix/pull request the gem...
Adding these two methods to your Model and calling get_embedded_document_changes should provide you an hash with the changes to all its embedded documents:
def get_embedded_document_changes
data = {}
relations.each do |name, relation|
next unless [:embeds_one, :embeds_many].include? relation.macro.to_sym
# only if changes are present
child = send(name.to_sym)
next unless child
next if child.previous_changes.empty?
child_data = get_previous_changes_for_model(child)
data[name] = child_data
end
data
end
def get_previous_changes_for_model(model)
data = {}
model.previous_changes.each do |key, change|
data[key] = {:from => change[0], :to => change[1]}
end
data
end
[ source: https://gist.github.com/derickbailey/1049304 ]
I have a directory of existing files which I need to migrate into my rails app as part of a legacy migration. Essentially I need to upload these files manually and save a new record for them in the database. I haven't quite found the proper way to do this. Currently I have the following in a rake task:
#attachments.each do |attachment|
begin
new_attachment = Attachment.new
#attachment_file_path = "/home/username/Attachments/" + attachment.Filename
file = File.open(#attachment_file_path)
new_attachment[:file] = new_attachment.file.store!(file)
# Map old record fields to new
new_attachment.attributes = {
:project_id => attachment.ProjectID,
:name => attachment.Description,
:user_id => attachment.UserId,
:created_at => attachment.CreatedDate,
:updated_at => attachment.LastModifiedDate
}
new_attachment.save!
puts "Attachment added successfully "
rescue => error
puts "Error migrating Attachment: #{error}"
end
end
attachment.rb
class Attachment < ActiveRecord::Base
mount_uploader :file, FileUploader
end
uploader:
class FileUploader < CarrierWave::Uploader::Base
include CarrierWave::RMagick
include CarrierWave::MimeTypes
process :set_content_type
storage :fog
def store_dir
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end
def extension_white_list
%w(jpg jpeg gif png pdf doc docx txt)
end
version :thumb do
process resize_to_fit: [152, nil]
end
def default_url
ActionController::Base.helpers.asset_path("fallback/" + [version_name, "default.png"].compact.join('_'))
end
protected
def image?(new_file)
if new_file.content_type == nil
return false
else
new_file.content_type.include? 'image'
end
end
end
This does not work currently. The file never gets uploaded, and occasionally I get the following error:
Failed to manipulate with rmagick, maybe it is not an image? Original Error: no decode delegate for this image format
In this instance, the file is a '.doc' file.
What is the correct way to open a local file and upload it manually via Carrierwave?
Any help is appreciated.
Try this
#attachments.each do |attachment|
begin
options = {
:project_id => attachment.ProjectID,
:name => attachment.Description,
:user_id => attachment.UserId,
:created_at => attachment.CreatedDate,
:updated_at => attachment.LastModifiedDate,
:file => File.new(File.join("/home/username/Attachments/",attachment.Filename))
}
new_attachment = Attachment.new(options)
new_attachment.save!
puts "Attachment added successfully "
rescue => error
puts "Error migrating Attachment: #{error}"
end
end
Perhaps that would do for you as carrierwave would internally call store! for you
Question?
Failed to manipulate with rmagick, maybe it is not an image? Original Error: no decode delegate for this image format
Not sure what are you trying to over here because you have define an image? method which is not specified in condition also is that something that you want the content_type to be only present for image file
if no perhaps only the process call would work
process :set_content_type
if yes then perhaps you have to do something like this
process :set_content_type , :if => :image?
def image?(new_file)
%w(jpg jpeg gif).include?(new_file.extension)
end
Hope this help
EDIT based upon the comment
try this just used the condition same logic
version :thumb ,:if => image? do
// your code
end
Super beginner here.
Here's what I am trying to do:
Build a basic to do list app, where User X logs in with facebook, adds some items, sees them, logs out. User Y/Z/M/etc, should be able to log in see their OWN list, add their OWN items, etc.
AKA: a standard web app where you log in to your account and see your own info.
What I have so far:
Ability to build a list, log in with Facebook and having it know your name.
However, the list stays the same whether I log in or whether my friend logs in with her account.
What I need to do, and don't know how:
I need each user to be able to create and see their own list, and be able to come back to it and still see it/ add to it, etc.
I don't even know how this is called, would this be a database of users each with their own set of data? Would the lists need to be set up so they could be stored as a chunk of data?
Does it have something to do with this :Sessions in Sinatra using Facebook authentication If so, what?
If anyone could be give me some really really basic directions as to where to go from here, any tutorials or what I should be googling for, that'd be awesome.
Here's my main piece of code (warning: it's really messy) :
require 'sinatra'
require 'data_mapper'
require 'time'
require 'rubygems'
require 'json'
require 'omniauth'
require 'omniauth-facebook'
#TODO require 'omniauth-att'
SCOPE = 'email,read_stream'
DataMapper::setup(:default, "sqlite3://#{Dir.pwd}/queue.db")
class SinatraApp < Sinatra::Base
configure do
set :sessions, true
set :inline_templates, true
set :protection, :except => :frame_options
end
class Note
include DataMapper::Resource
property :id, Serial
property :content, Text, :required => true
property :complete, Boolean, :required => true, :default => false
property :created_at, DateTime
property :updated_at, DateTime
end
class User
include DataMapper::Resource
property :id, Serial
property :uid, String
property :name, String
property :created_at, DateTime
end
###### no clue what this does ##############
DataMapper.finalize
DataMapper.auto_upgrade!
enable :session
use OmniAuth::Builder do
provider :facebook, '464630283595639','5e4c7ad43bf111c10287c981d51127a3',:scope => SCOPE, :display => "popup"
#provider :att, 'client_id', 'client_secret', :callback_url => (ENV['BASE_DOMAIN']
end
###### root ##############
get '/' do
if current_user
#notes = Note.all :order => :id.desc
#title = 'Movie Queue'
erb :home
else
' sign in with Facebook'
end
end
###### authentication ##############
["/sign_in/?", "/signup/?"].each do |path|
get path do
redirect '/auth/facebook'
end
end
get '/auth/:name/callback' do
auth = request.env["omniauth.auth"]
user = User.first_or_create({ :uid => auth["uid"]}, {
:uid => auth["uid"],
:name => auth["first_name"],
:created_at => Time.now })
session[:user_id] = user.id
redirect '/'
end
helpers do
def current_user
#current_user ||= User.get(session[:user_id]) if session[:user_id]
end
end
##list making part###
post '/' do
n = Note.new
n.content = params[:content]
n.save
redirect '/'
end
get '/:id/delete' do
n = Note.get params[:id]
if n.destroy
redirect '/', :notice => 'Note deleted successfully.'
else
redirect '/', :error => 'Error deleting note.'
end
end
get '/:id/complete' do
n = Note.get params[:id]
n.complete = n.complete ? 0 : 1 # flip it
n.save
redirect '/'
end
########## logout and error handlers #############
get '/logout' do
session[:user_id] = nil
redirect '/'
end
get '/auth/failure' do
erb "<h1>Authentication Failed:</h1><h3>message:<h3> <pre>#{params}</pre>"
end
get '/auth/:provider/deauthorized' do
erb "#{params[:provider]} has deauthorized this app."
end
get '/protected' do
throw(:halt, [401, "Not authorized\n"]) unless session[:authenticated]
erb "<pre>#{request.env['omniauth.auth'].to_json}</pre><hr>
<a href='/logout'>Logout</a>"
end
end
########## don't know what this is #############
SinatraApp.run! if __FILE__ == $0
Disclaimer: I don't know Datamapper, but this should get you going.
There needs to be a way to associate a note with a user. This needs a table in the database, some would call it users_notes, personally I prefer users_rel_notes, (perhaps Datamapper has a convention for this… YMMV). Anyway, the table will have a minimum of 2 columns - the user's id, and the note id. You don't need a separate table as I wrote before (I'm lacking a bit of sleep, sorry!), that would be for a many to many relationship where a user could have several notes and a note could be associated with several users. For what you have, where only the owner of a note has access to it, it requires a one to many relationship. You could add a column to the notes table to store the user id.
Then, in the User class, add an association to the Note class, it's a one to many association and in Datamapper that's a has n, e.g.
has n, :notes
Now when you have a user instance, you can (probably) call the notes for that user via:
user.notes
I see you have the helper current_user defined, so if someone is logged on you could call current_user.notes to get back all the notes for the logged in user.
Remember, when you add a note to make sure you add a record to the association table, (probably, read the link) via user.notes << my_new_note.
The session is the information you keep around to identify the user and any other little bits of info that you may recurrently need. The likelyhood is, you're just storing an id for the user, or the facebook token that identifies them, and then during a request, if it's needed then you'll look inside the cookie, grab the id, look up that user by the id and get a user instance. Session info can be stored in several ways, most often cookies but you can use anything you would use to store any other data.
I have this ruby class with an array of links. As it is now I'm able to save a Paper object even if the array contains links that are not valid urls. I have a method that runs through the array and validates the urls and returns false if a url is invalid. But I want to get an error message when I try to call Paper.save. Is that possible?
class Paper
include MongoMapper::Document
key :links, Array
validates_presence_of :links
def validate_urls
reg = /^(http|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(([0-9]{1,5})?\/.*)?$/ix
status = []
links.each do |link|
if link.match(reg)
status.push('true')
else
if "http://#{link}".match(reg)
status.push('true')
else
status.push('false')
end
end
end
if status.include?('false')
return false
else
return true
end
end
end
If you're using MongoMapper from GitHub (which supports ActiveModel), see http://api.rubyonrails.org/classes/ActiveModel/Validations/ClassMethods.html#method-i-validate
class Paper
include MongoMapper::Document
key :links, Array
validates_presence_of :links
validate :validate_urls
def validate_urls
reg = /^(http|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(([0-9]{1,5})?\/.*)?$/ix
status = []
links.each do |link|
if link.match(reg)
status.push('true')
else
if "http://#{link}".match(reg)
status.push('true')
else
status.push('false')
end
end
end
if status.include?('false')
# add errors to make the save fail
errors.add :links, 'must all be valid urls'
end
end
end
Not sure if that code works with the 0.8.6 gem but it might.
Also, it doesn't apply in this case but if it weren't an array you could smash it all into a single line:
key :link, String, :format => /your regex here/