[英]Where to store color information in a web application?
I've been working on a Django app for a scheduling system (using AJAX dhtmlScheduler library) and I need to color code the types of events.我一直在为调度系统开发 Django 应用程序(使用 AJAX dhtmlScheduler 库),我需要对事件类型进行颜色编码。 As part of each event, the client expects me to return a
#00F162
string indicating the color of the event.作为每个事件的一部分,客户希望我返回一个
#00F162
字符串,指示事件的颜色。 This is then parsed by the client and displayed by the Javascript.然后由客户端解析并由 Javascript 显示。
The styling guide is described below: http://docs.dhtmlx.com/doku.php?id=dhtmlxscheduler:custom_styling样式指南描述如下: http://docs.dhtmlx.com/doku.php?id=dhtmlxscheduler:custom_styling
The first option is to store a hex value in the DB, perhaps in the event_type
database.第一个选项是在数据库中存储一个十六进制值,可能在
event_type
数据库中。 The second option, is to place the logic for this in my application and calculate it based upon the shift selected.第二个选项是将此逻辑放在我的应用程序中,并根据所选班次进行计算。
Storing the entry in event_type
database seems strange, as I feel like I am mixing up the appearance with the model and the colors will not change.将条目存储在
event_type
数据库中似乎很奇怪,因为我觉得我将外观与 model 混淆了,而 colors 不会改变。 The second option means I am hard-coding the values in the app.第二个选项意味着我正在对应用程序中的值进行硬编码。
Which would be the best approach?哪种方法最好?
In this particular case I would store the hex colour code in a field within a model.在这种特殊情况下,我会将十六进制颜色代码存储在 model 中的一个字段中。
In essence:在本质上:
class Event(models.Model):
ALERT = "alert"
WARNING = "warning"
ERROR = "error"
EVENT_TYPES = (
(ALERT, "Alert"),
(WARNING, "Warning"),
(ERROR, "Error"),
)
YELLOW = "FF6A00"
ORANGE = "FFE800"
RED = "FF0000"
COLOURS = (
(YELLOW, "Yellow"),
(ORANGE, "Orange"),
(RED, "Red"),
)
event_type = models.CharField(max_length=16, choices=EVENT_TYPES, default=ALERT)
event_colour = models.CharField(max_length=6, choices=COLOURS, default=YELLOW)
Additional note, the reason for the “constants” is to make code that uses this model clean and simple.附加说明,“常量”的原因是使使用此 model 的代码简洁明了。
# example 1
error_events = Event.objects.filter(event_type=Event.ERROR)
# example 2
if my_event.event_type == Event.Error:
# this is an error event
pass
Also, here's one way you could do it without a colour field on the model:此外,这是一种在 model 上没有色域的方法:
class Event(models.Model):
ALERT = "alert"
WARNING = "warning"
ERROR = "error"
EVENT_TYPES = (
(ALERT, "Alert"),
(WARNING, "Warning"),
(ERROR, "Error"),
)
# map events to colours
COLOUR = {
ALERT: "FF6A00",
WARNING: "FFE800",
ERROR: "FF0000",
}
event_type = models.CharField(max_length=16, choices=EVENT_TYPES, default=ALERT)
@property
def colour(self):
"""
Return the hexadecimal colour of this event
"""
self.COLOUR[event_type]
# now this would return True
my_error_event.colour == "FF0000"
There are a couple of ways to do this.有几种方法可以做到这一点。
If the color for an event_type needs to be editable, I would store it in the database as a varchar.如果 event_type 的颜色需要可编辑,我会将其作为 varchar 存储在数据库中。
If the color is up to you, then I would probably slugify the __unicode__
of event_type and use CSS to target that class. This does present you with a small amount of maintenance, should a new event_type need to be added, but it gives you the separation of concerns.如果颜色由你决定,那么我可能会 slugify the
__unicode__
of event_type 并使用 CSS 来定位 class。如果需要添加新的 event_type,这确实会给你带来少量维护,但它给你关注点分离。
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