我正在按角度创建一个应用程序，其中一项任务是，我需要从Firestore中读取数据并保存到数组中，我的代码段如下：
public getListingData(): Observable < RequestListingModel > {
console.log("getting listing...");
this.firestore.collection('Requests').snapshotChanges().subscribe(
requests => {
this._listRequestItems = requests.map(a => {
const data = a.payload.doc.data() as RequestItemModel;
data.requestId = a.payload.doc.id;
console.log("doc found - " + data.requestId);
return data;
})
});
const requestListingModel = {
items: this._listRequestItems
}
as RequestListingModel;
return of(requestListingModel);
}
import * as dayjs from 'dayjs';
export class RequestItemModel {
name: string;
address: string;
category: string;
requestId: string;
postBy: string;
description: string;
// Default mock value
// expirationDate = '12/01/2018';
expirationDate: string = dayjs().add(5, 'day').format('MM/DD/YYYY HH:mm:ss') as string;
}
export class RequestListingModel {
items: Array<RequestItemModel> = [];
constructor(readonly isShell: boolean) { }
}
它不起作用，因为调用函数getListingData（）时总是返回空返回值，但是控制台可以成功打印出每个requestId，我认为我存储到数组的方式出了问题，请帮忙，谢谢！ / p>
答案 0 :(得分：0)
您的问题正在发生，因为事情是异步进行的：
因此import maya.cmds as mc
import pymel.all as pma
from functools import partial
BOOLEANMODE_ADD = 1
BOOLEANMODE_SUBTRACT = 2
PRIMITIVE_CUBE = 0
PRIMITIVE_CYLINDER = 1
PRIMITIVE_SPHERE = 2
PRIMITIVE_CUSTOM = 3
def cleanUp ():
mc.delete(constructionHistory=True)
mc.delete("*_ctrl*")
def hider(option, *args):
if option == 0:
mc.hide()
elif option == 1:
mc.select ("*_ctrl*")
mc.hide()
elif option == 2:
mc.select ("*_ctrl*")
mc.showHidden()
mc.select (clear=True)
def fixMaterial():
# pma.hyperShade( assign="lambert1" )
# works better with the command sets, jut put the SG you need
sel = mc.ls(sl = True)
if not mc.objExists('grey20'):
shaLambert = mc.shadingNode('lambert', asShader = True, name = 'grey20')
shaLambertSG = mc.sets(name = 'grey20SG', empty = True, renderable = True, noSurfaceShader = True)
mc.connectAttr('grey20.outColor', 'grey20SG.surfaceShader')
mc.sets(sel, edit = True, fe = shaLambertSG)
def triangulate():
mc.polyTriangulate()
def creator(primitives, *args):
selection = mc.ls(sl=True)
for x in selection:
if primitives == PRIMITIVE_CUBE:
a = makeCube() #Create cube
if primitives == PRIMITIVE_CYLINDER:
a = makeCyl() #Create cyl
if primitives == PRIMITIVE_SPHERE:
a = makeSphere() #Create sphere
if primitives == PRIMITIVE_CUSTOM:
a = selection[1]
x = selection[0]
mc.select(a)
b = createController(a)
meshConstrainer (b,a)
operator(x,a)
mc.select(b)
def operator(meshA, meshB):
booleanmode = get_boolean_mode()
# is there a way to replace this pymel ?
pma.polyBoolOp( meshA, meshB, op=booleanmode, n="basemesh" )
fixMaterial() #REMINDER: Need to be replaced with the actual assigned material and not with a lambert1 so for who is working with other materials can easyly keep using that
def get_boolean_mode(addRadioB=None, subRadioB=None):
# should not be implemented as string.....
if mc.radioButton('addRadio', query = True, select = True) :
return BOOLEANMODE_ADD
if mc.radioButton('subRadio', query = True, select = True) :
return BOOLEANMODE_SUBTRACT
return None
def makeCube():
cubeTransform = mc.polyCube(n="cubetobool", w=1, h=1, d=1, sx=1, sy=1, sz=1)[0]
return cubeTransform
def makeCyl():
cylTransform = mc.polyCylinder(n="cubetobool", r=1, h=2, sx=20)[0]
return cylTransform
def makeSphere():
sphereTransform = mc.polySphere(n="cubetobool", r=1, sx=20, sy=20, cuv=2)[0]
return sphereTransform
def meshConstrainer(constrainer, constrained):
mc.scaleConstraint( constrainer, constrained, maintainOffset=True)
mc.parentConstraint( constrainer, constrained, maintainOffset=True)
def createController(object):
#object = pma.ls(sl=True)
pivotObj = mc.xform(object,query=True,t=True,worldSpace=True)
edges = mc.filterExpand(mc.polyListComponentConversion(te=1),sm=32,ex=1) # convert edges to curve ancd create one object
for edge in edges:
vtx = mc.ls(mc.polyListComponentConversion(edge,fe=1,tv=1),fl=1)
p1 = mc.pointPosition(vtx[0])
p2 = mc.pointPosition(vtx[1])
curves = mc.curve(n="line_ctrl_curve", d=1,p=(p1,p2))
ctrl = mc.curve (n="bool_ctrl", d=1,ws=True, p=pivotObj)
mc.xform (centerPivots=True)
for curveEdge in mc.ls ("line_ctrl*"):
mc.parent(curveEdge,ctrl, s=1, r=1)
mc.rename(curveEdge, "shapeunused")
transforms = mc.ls(type='transform')
deleteList = []
for tran in transforms:
if mc.nodeType(tran) == 'transform':
children = mc.listRelatives(tran, c=True)
if children is None:
#print '%s, has no childred' %(tran)
deleteList.append(tran)
if not deleteList:
mc.delete(deleteList)
return ctrl
def deleteUI(name, *args):
mc.deleteUI(name)
#################TUTORIAL
def super_bool_tut():
windowNameTut = "Tutorial"
if mc.window(windowNameTut , exists=True):
mc.deleteUI(windowNameTut)
windowTutorial = mc.window(windowNameTut, title = windowNameTut, width = 400, height = 300, backgroundColor = [0.2, 0.2, 0.2])
mainSubLayout = mc.columnLayout( "testColumn", adjustableColumn = True)
lb_txt = "This tool is a super tool to make booleans wrote by Leonardo Iezzi. To make it works correctly, you need to have your base mesh already even if just a cube. "
lb_txt += "With your base mesh selected just press one of the three buttons on the windows to subtract or add those primitives. "
lb_txt += "If you want to use a custom mesh for the operation: select your base mesh then the custom one "
lb_txt += "(it's important to pick your base mesh first) and then press the 'Use custom mesh' button. After you have done, select your base mesh and press 'Clean Up.'"
mc.text("intro", label = lb_txt ,wordWrap= True, height = 100, backgroundColor = [0.2, 0.2, 0.2], align='left', parent = mainSubLayout)
mc.separator(parent = "testColumn", height=20)
mc.button("goit", label = "Got it", width = 120, height = 40, backgroundColor = [0.5, 0.5, 0.5], parent = mainSubLayout, command = partial(deleteUI, windowNameTut))
mc.showWindow()
################################################################################################UI#################################################
# @@@@@@@ THIS IS POLYSHIFTER!! I HAVE ADDED THIS AS A FUNCTION INSTEAD OF LEAVING IT UNINDENTED
def super_bool_ui():
windowName = "SuperBool"
w, h = (120, 200)
if mc.window(windowName , exists=True):
mc.deleteUI(windowName)
window = mc.window( windowName, title= windowName, width = w, height = h)
mainLayout = mc.columnLayout( "mainColumn", adjustableColumn = True)
################################################################################################UI#################################################
gridl_01 = mc.gridLayout("nameGridLayout01", numberOfRowsColumns = (1,4), cellWidthHeight = (40,40), parent = mainLayout)
btn_symb = mc.symbolButton("nameButton1", image = "polyCube.png", width = 40, height = 40, backgroundColor = [0.2, 0.2, 0.2], parent = gridl_01, command = partial(creator, PRIMITIVE_CUBE))
mc.symbolButton("nameButton2", image = "polyCylinder.png", width = 40, height = 40, backgroundColor = [0.2, 0.2, 0.2], parent = gridl_01, command = partial(creator, PRIMITIVE_CYLINDER))
mc.symbolButton("nameButton3", image = "polySphere.png", width = 40, height = 40, backgroundColor = [0.2, 0.2, 0.2], parent = gridl_01, command = partial(creator, PRIMITIVE_SPHERE))
vl_column01 = mc.columnLayout("columnLayoutName01", adjustableColumn = True, backgroundColor = [0.2, 0.2, 0.2], p=mainLayout)
mc.radioCollection("collection10", parent = vl_column01)
subRadioB = mc.radioButton("subRadio", select = True, label = "Sub")
addRadioB = mc.radioButton("addRadio", label = "Add")
################################################################################################UI#################################################
mc.separator(parent = mainLayout, height=20)
mc.button("customMeshB", label = "Use Custom Mesh", width = 120, height = 40, backgroundColor = [0.2, 0.2, 0.2], parent = mainLayout, command = partial(creator, PRIMITIVE_CUSTOM))
mc.separator(parent = mainLayout, height=20)
################################################################################################UI#################################################
gridl_02 = mc.gridLayout("nameGridLayout03", numberOfRowsColumns = (1,3), cellWidthHeight = (53,40), parent = mainLayout)
mc.button("hidSelB", label = "Hide Sel", height = 40, backgroundColor = [0.2, 0.2, 0.2], parent = gridl_02, command = partial(hider, 0))
mc.button("hidAllB", label = "Hide All", height = 40, backgroundColor = [0.2, 0.2, 0.2], parent = gridl_02, command = partial(hider, 1))
mc.button("showAll", label = "Show All", height = 40, backgroundColor = [0.2, 0.2, 0.2], parent = gridl_02, command = partial(hider, 2))
mc.separator(parent = mainLayout, height=20)
mc.button("clean", label = "Clean Up", width = 120, height = 40, backgroundColor = [0.2, 0.2, 0.2], parent = mainLayout, command = cleanUp)
mc.separator(parent = mainLayout, height=20)
################################################################################################UI#################################################
################################################################################################UI#################################################
gridl_03 = mc.gridLayout("nameGridLayout02", numberOfRowsColumns = (1,2), cellWidthHeight = (80,40), parent = mainLayout)
mc.button("triangB", label = "Triangulate", width = 120, height = 40, backgroundColor = [0.2, 0.2, 0.2], parent = gridl_03, command = triangulate)
mc.button("fixMatB", label = "FixMaterial", width = 120, height = 40, backgroundColor = [0.2, 0.2, 0.2], parent = gridl_03, command = fixMaterial)
################################################################################################UI#################################################
mc.showWindow()
###################################################################
################## ###################
################## END OF SUPER BOOL TOOL ###################
################## ###################
###################################################################
###################################################################
################## ###################
################## BEGINNING OF MY UI SCRIPT ###################
################## ###################
###################################################################
#### My custom script ####
def my_custom_script_com(*args):
super_bool_ui()
super_bool_tut()
# Create a custom floating window with
if mc.window('ToolsWindow', q=True, exists=True):
mc.deleteUI('ToolsWindow')
if mc.workspaceControl('ToolsWorkspaceControl', q=True, exists=True):
mc.deleteUI('ToolsWorkspaceControl')
mc.window('ToolsWindow')
mainL = mc.columnLayout()
tabLayout = mc.tabLayout('ToolsTabs', p=mainL)
#########################################################
################## IMPORTING PANEL ################
#########################################################
tabMenu = mc.columnLayout("Menu", adj=True, p=tabLayout)
separator_long = mc.separator(
height=10,
style='in', p=tabMenu)
mc.button(label="MyCustomScript", command = my_custom_script_com, p=tabMenu)
mc.showWindow()
在return of(requestListingModel);填充数组之前被调用，从而返回一个可观察到的空数组。
由于您似乎想返回一个可观察的对象，因此请勿在方法内部this.firestore.collection('Requests').snapshotChanges().subscribe(...)。只需在可观察到的subscribe()上执行map()即可转换输出，然后让消耗代码订阅您的snapshotChanges方法。
getListingData()注意：仍然...目前无法测试，因此可能不是100％正确：-\
但希望能为您指明正确的方向。 ：-）