Posts (page 88)
-
7 min readIn Elixir, you can validate input by using the case statement to match the input against specific conditions. This allows you to check if the input meets certain criteria and handle the validation accordingly. You can use pattern matching to define the conditions that the input must meet, and return an appropriate response based on whether the input is valid or not.
-
5 min readIn Solr, stemmed text can be stored and retrieved by using the "text_general" or "text_en" field types. When configuring the schema.xml file for Solr, make sure to define a field with one of these types for storing stemmed text.To store stemmed text in Solr, the text should be analyzed and indexed during the indexing process. This can be achieved by using the appropriate text analyzer for stemming in the field definition.
-
7 min readIn Elixir, you can check for a valid guard expression by using the defguard macro, which allows you to define custom guards. These custom guards can be used in the when clause of a function definition to enforce certain conditions on the input parameters.To create a valid guard expression, you need to define a guard function using the defguard macro and then use it in the when clause of a function definition.
-
5 min readTo include computed data in the Solr query response, you can use the "fl" parameter in the Solr query to specify the fields that you want to retrieve from the documents in the search result.You can use field references and functions in the "fl" parameter to compute new fields in the query response. For example, you can use a function like "sum(field1, field2)" to compute the sum of two fields in the response.
-
2 min readThe "?" operator in Elixir is commonly used as the "is" operator. It is used to check if a given expression meets certain conditions and returns either true or false. The "?" operator is typically paired with ":" to create a ternary expression, allowing for concise conditional logic in Elixir code.[rating:4418d73d-f96d-4383-97bd-2aa68e7b6810]What does the "?" operator evaluate in Elixir?In Elixir, the ".
-
8 min readAfter the finishing delta-import on Solr, you can execute a query to fetch updated information or data from the Solr index. You can use Solr's query syntax to specify the criteria for the information you want to retrieve. This query can be sent to the Solr server using HTTP requests or through the Solr client libraries in various programming languages.
-
3 min readIn Elixir, the IO.inspect/2 function is used to print a value to the screen. If you want to inspect a value to a file or a string instead, you can use the IO.inspect/2 function along with the :into option.To inspect a value to a file, you can use the :file option with the :into option. For example: file = File.open("output.txt", [:write]) value = %{key: "value"} IO.inspect(value, [into: file]) This will inspect the value to the file named "output.txt".
-
7 min readTo import data from MySQL to Solr, you can use the DataImportHandler feature provided by Solr.First, you need to define a data source in your Solr configuration file that specifies the connection details to your MySQL database. This includes the database URL, username, password, and the SQL query to fetch the data you want to import.
-
5 min readTo convert a binary into a list of structs in Elixir, you can use pattern matching and recursion. First, you need to define a struct that represents the data structure you want to convert the binary into. Then, you can write a function that takes the binary as input and recursively parses it to create a list of instances of the struct.You can use the <<>> syntax in Elixir to extract values from the binary.
-
6 min readIndexing XML documents in Apache Solr involves defining a data import handler (DIH) configuration that specifies how the XML data should be fetched and transformed into Solr documents. This configuration typically includes defining a data source (e.g. a file path or URL pointing to the XML document), a data processor (e.g. XPathEntityProcessor for extracting data using XPath expressions), and a document entity (e.g. mapping XML elements to Solr fields).
-
4 min readIn Elixir, you can mock module attributes and other modules by using the module_attribute macro and the Module module's defmock function, respectively.To mock module attributes, you can use the module_attribute macro to define a new module attribute with a specific value for testing purposes. This allows you to override the default value of a module attribute during testing without affecting the original implementation.To mock other modules, you can use the Module.
-
5 min readIn Elixir, you can pass maps to functions in a similar way to passing other data types. When defining a function, you can specify a parameter that accepts a map as an argument. To pass a map to this function, you simply include the map as an argument when calling the function.