Class: Json2sql::SelectRunner

Inherits:
Object
  • Object
show all
Defined in:
lib/json2sql/select_runner.rb

Overview

Builds a top-level SELECT statement from a Hash of table → params.

Usage:

sql = Json2sql::SelectRunner.build(
  "users" => {
    "columns" => ["id", "name", "email"],
    "and"     => { "active" => 1, "role" => { "in" => [1, 2] } },
    "order"   => { "created_at" => "desc" },
    "limit"   => 20,
    "offset"  => 0,
    "options" => ["total"]
  }
)

Output wraps every table in JSON_OBJECT so the client receives a single JSON document:

SELECT JSON_OBJECT('users', (...));

Class Method Summary collapse

Class Method Details

.build(input) ⇒ Object 



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# File 'lib/json2sql/select_runner.rb', line 23

def self.build(input)

  sql = +""
  
  separator = false

  input = Json2sql.normalize(input)

  relation = WhereRelation.none("")

  sql << "SELECT JSON_OBJECT("

  input.each do |table, value|

    next unless value.is_a?(Hash)

    sql << ", " if separator

    separator = true

    sql << Sanitizer.keyword_wrap(table.to_s, "'")

    sql << ", ("

    SelectModel.new(sql, table.to_s, relation).build_query_options(value)

    sql << ")"
  end

  sql << ");\n"

  sql
end