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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".
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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.
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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.
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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).
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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.
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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.
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5 min readIn Elixir, variables work with recursion in the same way they work with any other function. When using recursion, variables in Elixir maintain their value throughout each recursive call, just like in any other function. This means that variables can be defined and used in the same way within a recursive function as they would be in a non-recursive function.Recursion in Elixir is a common technique used for iteration since Elixir does not have traditional loops like for or while loops.
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5 min readTo define new guards in Elixir, you can use the defguard macro in a module. This allows you to create custom guards that can be used in pattern matching or guards in functions. Guards are expressions that can be used to filter out function clauses based on conditions.When defining a new guard, you can specify the guard name along with the conditions that need to be met.
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4 min readIn Elixir, you can combine multiple lists to create a nested list by using the ++ operator to concatenate lists. This can be achieved by creating a list that contains the lists you want to combine, and then using Enum.concat to concatenate them. For example, if you have two lists [1, 2, 3] and [4, 5, 6] and you want to combine them into a nested list, you can do so by creating a list [list1, list2] where list1 = [1, 2, 3] and list2 = [4, 5, 6], and then using Enum.
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5 min readIn Elixir, you can set the decimal precision globally by using the :erlang.set_rounding_mode/1 function with the :extended option. This will set the decimal precision for all floating-point arithmetic operations in the current process. Keep in mind that this setting will only affect the current process and will not be applied globally across all processes in the Elixir application.[rating:4418d73d-f96d-4383-97bd-2aa68e7b6810]How to apply decimal precision settings to Ecto queries in Elixir.
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6 min readTo update all elements of a nested map in Elixir, you can use the Map.update_nested/3 function provided by the MapSet library. This function allows you to update a nested map by passing in the keys of the map and a function that will update the value at those keys. This can be useful when you have a nested map structure and you want to update multiple elements at once.Here is an example of how you can use Map.