object

问题 I am surprised that my question was not asked (worded like the above) before. I am hoping that someone could break down this basic term "object" in the context of a OOP language like Python. Explained in a way in which a beginner like myself would be able to grasp. When I typed my question on Google, the first post that appears is found here. This is the definition: An object is created using the constructor of the class. This object will then be called the instance of the class. Wikipedia

问题 can I store PDF files in the database, as object or blob, with Flask-Admin? I do not find any reference in the documentation. Thanks. Cheers 回答1: Below is a self contained an example of storing files directly in a blob field via Flask-Admin. There is minimal error checking but it should get you going in the right direction. The important parts of the code: class BlobMixin(object): mimetype = db.Column(db.Unicode(length=255), nullable=False) filename = db.Column(db.Unicode(length=255),

问题 can I store PDF files in the database, as object or blob, with Flask-Admin? I do not find any reference in the documentation. Thanks. Cheers 回答1: Below is a self contained an example of storing files directly in a blob field via Flask-Admin. There is minimal error checking but it should get you going in the right direction. The important parts of the code: class BlobMixin(object): mimetype = db.Column(db.Unicode(length=255), nullable=False) filename = db.Column(db.Unicode(length=255),

问题 I have below this nested object I need to create an array using this object containing keys . And if keys are object then it should use .dot syntax. and if it is an array then it should give me key.0.keyName . Is it possible to do so? Output [ "AllowIPNPayment", "AllowOnlinePayment", "MetaData.CreateTime", "MetaData.LastUpdatedTime", "CustomField.0.DefinitionId", "CustomField.0.Name", "CustomField.0.Type", ... ] What I have tried is just ugly and does give me expected result. If it is

问题 I have below this nested object I need to create an array using this object containing keys . And if keys are object then it should use .dot syntax. and if it is an array then it should give me key.0.keyName . Is it possible to do so? Output [ "AllowIPNPayment", "AllowOnlinePayment", "MetaData.CreateTime", "MetaData.LastUpdatedTime", "CustomField.0.DefinitionId", "CustomField.0.Name", "CustomField.0.Type", ... ] What I have tried is just ugly and does give me expected result. If it is

问题 I have below this nested object I need to create an array using this object containing keys . And if keys are object then it should use .dot syntax. and if it is an array then it should give me key.0.keyName . Is it possible to do so? Output [ "AllowIPNPayment", "AllowOnlinePayment", "MetaData.CreateTime", "MetaData.LastUpdatedTime", "CustomField.0.DefinitionId", "CustomField.0.Name", "CustomField.0.Type", ... ] What I have tried is just ugly and does give me expected result. If it is

问题 In NodeJS I want to find "This text must change" in json. This is currently my code: var fs = require('fs'), parseString = require('xml2js').parseString, xml2js = require('xml2js'); fs.readFile('content.xml', 'utf-8', function (err, data){ if(err) console.log(err); parseString(data, function(err, result){ if(err) console.log(err); var json = result; console.log(json); var needle = 'This text must change'; for (var i = 0; i < json.length; i++){ if (json[i] == needle){ console.log("Found it");

问题 This question already has answers here : String is immutable. What exactly is the meaning? [duplicate] (19 answers) Closed 4 years ago . How can this be if I can create a String, giving it a value. Then, I can simply overwrite its value like this: String a="abc"; a="def"; How is it possible that I can change the value of a ? I must be missing something here. I understand that Strings literals are used whenever creating a String object, rather than creating a new instance of String every time

问题 This question already has answers here : String is immutable. What exactly is the meaning? [duplicate] (19 answers) Closed 4 years ago . How can this be if I can create a String, giving it a value. Then, I can simply overwrite its value like this: String a="abc"; a="def"; How is it possible that I can change the value of a ? I must be missing something here. I understand that Strings literals are used whenever creating a String object, rather than creating a new instance of String every time

问题 Originally, I was rendering components by using this code to map an array of objects( [{}, {}, {}] ): let todoComponents = allTodos.map(item => <Todos key={item.id} item={item} handleChange={handleChange}/>) However, this does not work on a separate project where I am getting data from Firebase with a different data structure. In it, each object has a unique name. [{ "-M8CpcbvDriZpw4sc4IW" : { "completed" : false, "id" : "-M8CpcbvDriZpw4sc4IW", "text" : "Get Comic Book" }, "-M8Cpku0PCNu0