update required metadata schema

x/gov/README.md

@@ -40,14 +40,16 @@ In Mars `customgov`, we want to storage the metadata on-chain. In order for this
   ```typescript
   type ProposalMetadata = {
     title: string;
-    authors: string[];
-    summary?: string;
-    details: string;
+    authors?: string[];
+    summary: string;
+    details?: string;
     proposal_forum_url?: string;
     vote_option_context?: string;
   };
   ```
 
+  We make `title` and `summary` mandatory and the other fields optional, because from sdk 0.47 [proposals will have mandatory title and summary fields](https://github.com/cosmos/cosmos-sdk/blob/v0.47.0-rc1/proto/cosmos/gov/v1/gov.proto#L85-L93). Once Mars Hub upgrades to sdk 0.47, we can make these two fields optional as well.
+
 - For vote metadata, we assert that it is either an empty string (it's ok if a voter doesn't want to provide a rationale for their vote), or if it's not empty, conforms to this schema:
 
   ```typescript

x/gov/keeper/msg_server_test.go

@@ -37,8 +37,7 @@ func TestProposalMetadataTypeCheck(t *testing.T) {
 			"a valid metadata with missing optional fields",
 			`{
 				"title": "Mock Proposal",
-				"authors": [],
-				"details": "This is a mock-up proposal for use in the unit tests of Mars Hub's gov module."
+				"summary": "Mock proposal for testing purposes"
 			}`,
 			true,
 		},
@@ -54,8 +53,7 @@ func TestProposalMetadataTypeCheck(t *testing.T) {
 			"extra unexpected fields are accepted",
 			`{
 				"title": "Mock Proposal",
-				"authors": ["Larry Engineer <[email protected]>"],
-				"details": "This is a mock-up proposal for use in the unit tests of Mars Hub's gov module.",
+				"summary": "Mock proposal for testing purposes",
 				"foo": "bar"
 			}`,
 			true,

x/gov/types/metadata.go

@@ -7,9 +7,9 @@ import (
 // ProposalMetadata defines the required schema for proposal metadata.
 type ProposalMetadata struct {
 	Title             string   `json:"title"`
-	Authors           []string `json:"authors"`
-	Summary           string   `json:"summary,omitempty"`
-	Details           string   `json:"details"`
+	Authors           []string `json:"authors,omitempty"`
+	Summary           string   `json:"summary"`
+	Details           string   `json:"details,omitempty"`
 	ProposalForumURL  string   `json:"proposal_forum_url,omitempty"`
 	VoteOptionContext string   `json:"vote_option_context,omitempty"`
 }
@@ -43,12 +43,8 @@ func UnmarshalProposalMetadata(metadataStr string) (*ProposalMetadata, error) {
 		return nil, ErrInvalidMetadata.Wrap("missing field `title`")
 	}
 
-	if metadata.Authors == nil {
-		return nil, ErrInvalidMetadata.Wrap("missing field `authors`")
-	}
-
-	if metadata.Details == "" {
-		return nil, ErrInvalidMetadata.Wrap("missing field `details`")
+	if metadata.Summary == "" {
+		return nil, ErrInvalidMetadata.Wrap("missing field `summary`")
 	}
 
 	return &metadata, nil