Working with many to many through associations in Rails.

switch_fields.rb

Switch.find(user_input)
      .fields
      .includes(:operations)
      .includes(:operators)
      .map { |field| [field.id, field.name, field.operators.map { |operator| [operator.id, operator.name] } ] }

# Returns:
# [[1, "Record Type",            [[1, "="]]],
# [2,  "Answer DateTime",        [[1, "="], [3, ">"], [4, "<"], [5, ">="], [6, "<="]]],
# [3,  "Answer Duration",        [[1, "="], [3, ">"], [4, "<"], [5, ">="], [6, "<="]]],
# [4,  "Calling Number",         [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [5,  "Called Number",          [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [6,  "Dialed Number",          [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [7,  "IMSI",                   [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [8,  "IMEI",                   [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [9,  "First MCC-MNC",          [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [10, "First LAC",              [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [11, "First Cell ID",          [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [12, "Last MCC-MNC",           [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [13, "Last LAC",               [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [14, "Last Cell ID",           [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [15, "In Circuit Group",       [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [16, "Out Circuit Group",      [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [17, "Cause for Termination",  [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [18, "Call Reference",         [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [19, "CAMEL Call Reference",   [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]],
# [20, "Supplementary Service",  [[1, "="], [7, "contains"], [8, "starts with"], [9, "ends with"]]]]