Posts (page 89)
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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.
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6 min readTo boost search text results using Apache Solr, you can leverage several techniques. One common approach is to adjust the relevance ranking of search results by applying boosting factors to certain fields or documents. This can be achieved by using boosting functions, boosting queries, or boosting documents based on specific criteria.Another strategy is to enhance the quality of search results by optimizing the schema design.
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5 min readTo set the number of facets in Solr by default, you can modify the configuration file of your Solr instance. You will need to locate the solrconfig.xml file in the conf/ directory of your Solr instance and open it with a text editor. Look for the section that defines the facet component and find the "facet.limit" parameter. You can set the default number of facets by changing the value of this parameter. Save the file and restart your Solr instance for the changes to take effect.
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6 min readTo increase the ranking of a search text in Solr, you can use various techniques such as optimizing your schema to better represent the data being searched, using relevant fields in your queries, configuring the ranking algorithm to prioritize certain fields or boost certain criteria, and utilizing features like boosting, synonyms, stemming, and stop words to improve search results accuracy.
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8 min readA composite key field in Apache Solr can be created by concatenating multiple fields together to form a unique identifier for each document in the index. This can be done using the ConcatFieldUpdateProcessorFactory, which allows you to combine multiple fields into a single field within the Solr document.To create a composite key field, you first need to define the fields that will be concatenated together to form the key.
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7 min readTo implement proximity search with dates in Solr, you can use the "date range" query parser. This allows you to specify a range of dates and search for documents that fall within that range.You can also use the "boost" parameter to give higher relevance to documents that are closer to the specified date range. Additionally, you can use the "fq" (filter query) parameter to further refine your search results based on specific date criteria.
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5 min readIn Solr, you can group search results by domain using the "group" feature in the query parameters. By setting the "group.field" parameter to the domain field in your schema, you can group search results by the specified domain field. This will return grouped results where each group represents a unique domain. Additionally, you can customize the grouping format and sorting options by adjusting the "group.format" and "group.sort" parameters.
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3 min readTo get all results from a Solr query, you can simply set the "rows" parameter to a high number or to "-1" which indicates that you want to retrieve all results without any limit. Keep in mind that retrieving a large number of results can impact the performance of your Solr server, so it's important to consider the potential impact on system resources.