Category Ruby json get value

Ruby json get value

Below is an ever-growing collection of code examples to highlight the differences in different programming languages and serve as a practical reference.

Please contribute pull request if you have a better approach or a new language. I don't know Java. Is this really the most simple way without 3rd party packages? Apache Groovy is a Java-syntax-compatible object-oriented programming language for the Java platform.

With WebClient. Code Source. Dart is "an object-oriented, class defined, garbage-collected language using a C-style syntax that transcompiles optionally into JavaScript. Swift is a "general-purpose, multi-paradigm, compiled programming language developed by Apple. Rust is "a multi-paradigm systems programming language focused on safety, especially safe concurrency.

Rust does not expose an http client? You have to use hyper or reqwest.

Everything you need to know about johnwarnings.spaceify() and johnwarnings.space()

Does anyone know if its possible with just Rust? Jump to an implementation: Node. BufferedReader ; import java. IOException ; import java. InputStream ; import java. InputStreamReader ; import java. Reader ; import java. URL ; import java. Charset ; import org. JSONException ; import org. ReadAll response.

Body if err! Notice a typo or something incorrect? Leave a comment or submit changes via GitHub.JSON is a lightweight data-interchange format. It is easy for us humans to read and write.

Plus, equally simple for machines to generate or parse. JSON is completely language agnostic, making it the ideal interchange format. To read more about JSON visit: json. To parse a JSON string received by another application or generated within your existing application:. Notice the extra quotes '' around the hash notation.

Ruby expects the argument to be a string and can't convert objects like a hash or array. Creating a JSON string for communication or serialization is just as simple. The global default options for the JSON.

If object is string-like, parse the string and return the parsed result as a Ruby data structure. See generate and parse for their documentation. Dumps obj as a JSON string, i. If the number of nested arrays or objects exceeds limitan ArgumentError exception is raised. This argument is similar but not exactly the same! This method disables the checks for circles in Ruby objects. It defaults to a state object, that creates the shortest possible JSON text in one line, checks for circular data structures and doesn't allow NaNInfinityand -Infinity.

This options defaults to false. Load a ruby data structure from a JSON source and return it. A source can either be a string-like object, an IO-like object, or an object responding to the read method. If proc was given, it will be called with any nested Ruby object as an argument recursively in depth first order. To modify the default options pass in the optional options argument as well. BEWARE: This method is meant to serialise data from trusted user input, like from your own database server or clients under your control, it could be dangerous to allow untrusted users to pass JSON sources into it.

It defaults to This option defaults to false. Otherwise strings are returned. Strings are the default. The bang version of the parse method defaults to the more dangerous values for the opts hash, so be sure only to parse trusted source documents. The parse! This option defaults to true.

ruby json get value

The returned document is a prettier form of the document returned by unparse.Perhaps you're one of those party people. Let's build a real simple app with a Party model as example:. Pretty simple: a name, a description, start and end times.

ruby json get value

Now onto the API. A typical Ruby-based serializer could look something like this:. Also note that ActiveRecord has its own serialization helper that can be used to achieve the same results as above. Okay, then we can use PartySerializer like so:. Fair enough. Seems to work just fine. You might even choose to ditch Ruby core-based JSON formatting and use some fancy super-fast gem to speed things up. Again, we're using Rails as an example but something very similar will happen regardless of the framework or lack thereof that you use:.

Looks like a lot of work. What if we could skip those intermediate steps entirely and just have the database do all the work for us? Here's what that would look like:. Looks much simpler, right? Let's analyze the differences between those lists. But the biggest difference here is that we skipped steps 4 and 5 from the previous list, which load the query results into memory and builds ActiveRecord models. In the end we're delivering JSON, so there is really no need to do that unless we really need something from the Ruby world: e.

Postgres has some pretty awesome built-in JSON functions and they're just perfect for this use case. So we can expect this:. To return objects like these:. But we want to return a list of objectsright? Those values are, in our case, the JSON objects we just built. So let's glue the two together. Here's the final query:. The examples we used are nice enough, but they seem awfully simple: they're entirely flat, that is, there is no nesting at all.

So something like:. Would produce what you'd expect:. But what about if you want to nest another table within that JSON?

ruby json get value

So we want the final result to be like this:. I know, I know: it seems awfully complicated compared to just a regular ActiveRecord joins.It is similar to an Array, except that indexing is done via arbitrary keys of any object type, not an integer index.

The order in which you traverse a hash by either key or value may seem arbitrary and will generally not be in the insertion order. If you attempt to access a hash with a key that does not exist, the method will return nil. As with arrays, there is a variety of ways to create hashes. We need to have an instance of Hash object to call a Hash method. This will return a new hash populated with the given objects. Now using the created object, we can call any available instance methods. Tests whether two hashes are equal, based on whether they have the same number of key-value pairs, and whether the key-value pairs match the corresponding pair in each hash.

Deletes a key-value pair from hash by key. If block is used, returns the result of a block if pair is not found. Iterates over hashcalling the block once for each key, passing the key-value as a two-element array. Iterates over hashcalling the block once for each key, passing key as a parameter. Iterates over hashcalling the block once for each keypassing the key and value as parameters.

Iterates over hashcalling the block once for each keypassing value as a parameter. Tests whether hash is empty contains no key-value pairsreturning true or false. Returns a value from hash for the given key. If the key can't be found, and there are no other arguments, it raises an IndexError exception; if default is given, it is returned; if the optional block is specified, its result is returned.

Returns the key for the given value in hash, nil if no matching value is found. Returns a new array consisting of values for the given key s. Will insert the default value for keys that are not found. This method is deprecated.

Use select. Creates a new hashinverting keys and values from hash ; that is, in the new hash, the keys from hash become values and values become keys. Rebuilds hash based on the current values for each key. If values have changed since they were inserted, this method reindexes hash.

Returns a new array consisting of key-value pairs from hash for which the block returns true. Converts hash to a two-dimensional array containing arrays of key-value pairs, then sorts it as an array.

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Creates a two-dimensional array from hash. Returns a new array containing the values from hash that are associated with the given key or keys.

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ruby json get value

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Active 9 years, 7 months ago. Viewed 61k times. Thank you. Anand Soni Anand Soni 5, 8 8 gold badges 46 46 silver badges 96 96 bronze badges. Active Oldest Votes. Rishav Rastogi Rishav Rastogi You need to parse the JSON object into a ruby hash. Jacob Jacob 1, 9 9 silver badges 7 7 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

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JSON with Ruby

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Arrays let you represent lists of data in your programs. Once you have data in an array, you can sort it, remove duplicates, reverse its order, extract sections of the array, or search through arrays for specific data. You can also convert an array to a stringtransform one array of data into another, and roll up an array into a single value.

These methods often have side-effects, such as mutating the original value, or raising exceptions. These methods return a boolean value. These are a naming convention used throughout Ruby. You also might recall that you can use the first and last methods to grab the first and last elements of an array:.

There are times you might want to grab a subset of values from your array instead of just a single element. For example, you can grab the two middle entries from the sharks array like this:. We start at index 1which is "Great White"and we specify we want 2 elements, so we get a new array containing "Great White" and "Hammerhead". The slice method also returns a new array, leaving the original array unaltered.

However, if you use the slice! The take method lets you grab the specified number of entries from the beginning of an array:. Sometimes you want to grab a random value from an array instead of a specific one. Those kinds of things require some kind of random value. A common solution is to put the possible choices in an array and select a random index. But Ruby arrays provide several methods specifically designed to simplify the process of searching through arrays.

If you just want to see if an element exists, you can use the include? However, include? The find method locates and returns the first element in the array that matches a condition you specify. For example, to identify the first entry in the sharks array that contains the letter ayou could use the each method to compare each entry and stop iterating when you find the first one, like this:.

If the last expression in the block evaluates to truethe find method returns the value and stops iterating.

The select method works in a similar way, but it constructs a new array containing all of the elements that match the condition, instead of just returning a single value and stopping. However, if you use the select! Sorting data is a common practice.

Get a particular key value from json in ruby

You may need to alphabetize a list of names or sort numbers from smallest to largest.JSON is a lightweight data-interchange format.

It is easy for us humans to read and write. Plus, equally simple for machines to generate or parse. JSON is completely language agnostic, making it the ideal interchange format.

Often referred to as an objecthash table, record, struct, keyed list, or associative array. To parse a JSON string received by another application or generated within your existing application:. Notice the extra quotes '' around the hash notation. Creating a JSON string for communication or serialization is just as simple. The generate method accepts a variety of options to set the formatting of string output and defining what input is accepteable.

JSON library provides optional additions allowing to serialize and deserialize Ruby classes without loosing their type. If object is string-like, parse the string and return the parsed result as a Ruby data structure. See generate and parse for their documentation. Dumps obj as a JSON string, i. If the number of nested arrays or objects exceeds limitan ArgumentError exception is raised. This argument is similar but not exactly the same! This method disables the checks for circles in Ruby objects.

If hash-alike or hash-convertible object is provided, it is internally converted into a State object. The default options are set to create the shortest possible JSON text in one line, check for circular data structures and do not allow NaNInfinityand -Infinity.

This options defaults to false. Load a ruby data structure from a JSON source and return it. A source can either be a string-like object, an IO-like object, or an object responding to the read method. If proc was given, it will be called with any nested Ruby object as an argument recursively in depth first order. To modify the default options pass in the optional options argument as well. BEWARE: This method is meant to serialise data from trusted user input, like from your own database server or clients under your control, it could be dangerous to allow untrusted users to pass JSON sources into it.

It defaults to This option defaults to false. Otherwise strings are returned. Strings are the default. The bang version of the parse method defaults to the more dangerous values for the opts hash, so be sure only to parse trusted source documents. The parse!


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Tozahn Posted on04:39 - 20.10.2020

ist gar nicht einverstanden