我用于加载文件gem dragonfly
我有模特照片：
class Photo < ApplicationRecord
dragonfly_accessor :avatar do
default 'public/avatar.png'
end
................................
end
当我致电pry(#<#<Class:0x007f83508fb8f0>>)> @photo.avatar.url
我得到了
=> "/media/W1siZmYiLCJwdWJsaWMvYXZhdGFyLnBuZyJdXQ/avatar.png?sha=338938a0ea07d56b"
设置文件蜻蜓。
dragonfly.rb
require 'dragonfly'
# Configure
Dragonfly.app.configure do
plugin :imagemagick
secret "7c510e8ed95f9929f09981ef5f42ffc75034703184575044d2835ebbbd2a350b"
url_format "/media/:job/:name"
datastore :file,
root_path: Rails.root.join('public/system/dragonfly', Rails.env),
server_root: Rails.root.join('public')
end
# Logger
Dragonfly.logger = Rails.logger
# Mount as middleware
Rails.application.middleware.use Dragonfly::Middleware
# Add model functionality
if defined?(ActiveRecord::Base)
ActiveRecord::Base.extend Dragonfly::Model
ActiveRecord::Base.extend Dragonfly::Model::Validations
end
我需要在image_tag中粘贴路径图像。如何才能获得正确的路径 ... / public / avatar.png ？
答案 0 :(得分：3)
我创立了解决方案：
public class SimulatorView extends JFrame {
private CarParkView carParkView;
private int numberOfFloors;
private int numberOfRows;
private int numberOfPlaces;
private Car[][][] cars;
private JButton button1;
private JButton button2;
private JLabel label;
private Simulator sim;
public SimulatorView(int numberOfFloors, int numberOfRows, int numberOfPlaces, Simulator sim) {
this.numberOfFloors = numberOfFloors;
this.numberOfRows = numberOfRows;
this.numberOfPlaces = numberOfPlaces;
this.sim = sim;
cars = new Car[numberOfFloors][numberOfRows][numberOfPlaces];
carParkView = new CarParkView();
button1 = new JButton("Run 1 time");
button2 = new JButton("Run 100 times");
label = new JLabel("Test bericht");
event a = new event();
button1.addActionListener(a);
event2 b = new event2();
button2.addActionListener(b);
// Dimension d = new Dimension(100,100);
// button1.setBounds(20,30,50,30);
// button2.setBounds(20,30,50,30);
//
JFrame jf = new JFrame("Parking Simulator");
jf.setLayout(new GridLayout(5,5));
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setBounds(10,10,1024,1024);
//
Container contentPane = jf.getContentPane();
//contentPane.add(stepLabel, BorderLayout.NORTH);
contentPane.add(carParkView, BorderLayout.CENTER);
contentPane.add(button1,BorderLayout.EAST);
contentPane.add(button2,BorderLayout.WEST);
//contentPane.add(population, BorderLayout.SOUTH);
pack();
jf.setVisible(true);
updateView();
}
public class event implements ActionListener {
public void actionPerformed(ActionEvent a){
sim.singletick();
}
}
public class event2 implements ActionListener {
public void actionPerformed(ActionEvent b){
Thread queryThread = new Thread(); {
sim.hundredtick();
}
}
}
public void updateView() {
carParkView.updateView();
}
public int getNumberOfFloors() {
return numberOfFloors;
}
public int getNumberOfRows() {
return numberOfRows;
}
public int getNumberOfPlaces() {
return numberOfPlaces;
}
public Car getCarAt(Location location) {
if (!locationIsValid(location)) {
return null;
}
return cars[location.getFloor()][location.getRow()][location.getPlace()];
}
public boolean setCarAt(Location location, Car car) {
if (!locationIsValid(location)) {
return false;
}
Car oldCar = getCarAt(location);
if (oldCar == null) {
cars[location.getFloor()][location.getRow()][location.getPlace()] = car;
car.setLocation(location);
return true;
}
return false;
}
public Car removeCarAt(Location location) {
if (!locationIsValid(location)) {
return null;
}
Car car = getCarAt(location);
if (car == null) {
return null;
}
cars[location.getFloor()][location.getRow()][location.getPlace()] = null;
car.setLocation(null);
return car;
}
public Location getFirstFreeLocation() {
for (int floor = 0; floor < getNumberOfFloors(); floor++) {
for (int row = 0; row < getNumberOfRows(); row++) {
for (int place = 0; place < getNumberOfPlaces(); place++) {
Location location = new Location(floor, row, place);
if (getCarAt(location) == null) {
return location;
}
}
}
}
return null;
}
public Car getFirstLeavingCar() {
for (int floor = 0; floor < getNumberOfFloors(); floor++) {
for (int row = 0; row < getNumberOfRows(); row++) {
for (int place = 0; place < getNumberOfPlaces(); place++) {
Location location = new Location(floor, row, place);
Car car = getCarAt(location);
if (car != null && car.getMinutesLeft() <= 0 && !car.getIsPaying()) {
return car;
}
}
}
}
return null;
}
public void tick() {
for (int floor = 0; floor < getNumberOfFloors(); floor++) {
for (int row = 0; row < getNumberOfRows(); row++) {
for (int place = 0; place < getNumberOfPlaces(); place++) {
Location location = new Location(floor, row, place);
Car car = getCarAt(location);
if (car != null) {
car.tick();
}
}
}
}
}
private boolean locationIsValid(Location location) {
int floor = location.getFloor();
int row = location.getRow();
int place = location.getPlace();
if (floor < 0 || floor >= numberOfFloors || row < 0 || row > numberOfRows || place < 0 || place > numberOfPlaces) {
return false;
}
return true;
}
private class CarParkView extends JPanel {
private Dimension size;
private Image carParkImage;
/**
* Constructor for objects of class CarPark
*/
public CarParkView() {
size = new Dimension(0, 0);
}
/**
* Overridden. Tell the GUI manager how big we would like to be.
*/
public Dimension getPreferredSize() {
return new Dimension(800, 400);
}
/**
* Overriden. The car park view component needs to be redisplayed. Copy the
* internal image to screen.
*/
public void paintComponent(Graphics g) {
if (carParkImage == null) {
return;
}
Dimension currentSize = getSize();
if (size.equals(currentSize)) {
g.drawImage(carParkImage, 0, 0, null);
}
else {
// Rescale the previous image.
g.drawImage(carParkImage, 0, 0, currentSize.width, currentSize.height, null);
}
}
public void updateView() {
// Create a new car park image if the size has changed.
if (!size.equals(getSize())) {
size = getSize();
carParkImage = createImage(size.width, size.height);
}
Graphics graphics = carParkImage.getGraphics();
for(int floor = 0; floor < getNumberOfFloors(); floor++) {
for(int row = 0; row < getNumberOfRows(); row++) {
for(int place = 0; place < getNumberOfPlaces(); place++) {
Location location = new Location(floor, row, place);
Car car = getCarAt(location);
Color color = car == null ? Color.white : Color.red;
drawPlace(graphics, location, color);
}
}
}
repaint();
}
/**
* Paint a place on this car park view in a given color.
*/
private void drawPlace(Graphics graphics, Location location, Color color) {
graphics.setColor(color);
graphics.fillRect(
location.getFloor() * 260 + (1 + (int)Math.floor(location.getRow() * 0.5)) * 75 + (location.getRow() % 2) * 20,
60 + location.getPlace() * 10,
20 - 1,
10 - 1); // TODO use dynamic size or constants
}
}
}
答案 1 :(得分：1)
您应该使用 url 的 remote_url instread来获取完整路径 喜欢
@photo.avatar.remote_url
如果您想在图片代码中使用上传的图片，则可以直接使用
image_tag(@photo.avatar.url)
答案 2 :(得分：1)