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Basically we can consider 3 types of items

1. Scalars 

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In SCALE integers can be encoded as fixed-width integer and compact integer. Compact integer itself has 4 modes. So generally we have 5 ways to serde integer (1 fixed-width + 4 modes of compact integers) 

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{
  "u8": {
    "Int": "

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FixedWidth"
  },

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  "iroha_introspect::Compact<u8>": {
    "Int": "Compact"
  }
}

2. Built-in basic types

•  bool: no tricks here
• String
"CompactTwoByte" //possible values FixedWidth, CompactSingleByte, CompactTwoByte, CompactFourByte, CompactBigInteger, }bool: no tricks here 

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{

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  "alloc::string::String": "String",
  "bool": "Bool"
}

23. Built-in containers 

• Option / Result / Map / Vec / typle : basically we are interested in only inner values of the container

  Code Block
  language js
  [ { "definition": "Option", "item"core::option::Option<iroha_data_model::isi::Instruction>": { "definitionOption" : "booliroha_data_model::isi::Instruction" } }, { "definition"core::result::Result<i32, i32>": "Result",{ "itemResult": { "definitionok": "inti32", "modeerr": "CompactFourBytei32" } }, { "definition": "Vec", "itemsalloc::collections::BTreeMap<alloc::string::String, i32>": { "definitionMap": "bool"{ } }, { "definitionkey": "tuple", "items": [ { "definition": "int", alloc::string::String", "modevalue": "CompactFourBytei32" } }, { "definition": "Option", "itemalloc::vec::Vec<i32>": { "definitionVec" : "booli32" } } ] } ]

  
  

43. Custom containers 

• Named structures – structures which have field names
• Unnamed structures – structures with no field names (like zero sized structures in rust, or tuples, or struct WrappedTuple(i32, i32))
• Structures: in structures definitions declared inline for built-in types and declared a reference for custom types Enums
  

  
  

  Code Block
  language bashjs
  { "definition"iroha_crypto::PublicKey": "struct",{ "nameNamedStruct": "Foo", //fully qualified non ambiguous name{ "codec": "SCALE", //possible values SCALE or JSON "properties"declarations": [ { "name": "enableddigest_function", //optional name "typety": { "definition": "bool" "alloc::string::String" } }, { "name": "idpayload", //optional name "typety": { "definition": "struct", //reference to other struct "alloc::vec::Vec<u8>" } "struct_name": "Id" ] } }, { "name": "counter", //optional name "iroha_data_model::account::SignatureCheckCondition": { "typeUnnamedStruct": { "definition"types": "int", [ "mode": "FixedWidthiroha_data_model::expression::EvaluatesTo<bool>" }] } ] }

  Enums: similar to Structures but also every variant of enum has a discriminator that used in Scale. By default based on 0

  ,

  but can be overridden by attributes

  Code Block
  { "definition"iroha_data_model::events::pipeline::EntityType": "enum",{ "nameEnum": "Bar", //fully qualified non ambiguous name{ "codec": "SCALE", //possible values SCALE or JSON "variants": [ { "name": "FirstVariantBlock", "discriminatordiscriminant": 10, "propertiesty": { ... null } }, { "name": "SecondVariantTransaction", "discriminatordiscriminant": 21, "propertiesty": {null } ... ] } } ]}, }

  
  

Concerns

Currently we are not support polymorphism via TraitObjects, but it can be implemented if necessary

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