Addition of required dependencies and updates to QueryMsg state to ma…

…ke sure the QueryResponses trait is implemented (#547)

Addition of required dependencies and updates to QueryMsg state to make sure the QueryResponses trait is imlemented

content/2.developers/3.guides/13.cosmwasm-by-example/9.amm-product.md

@@ -7,6 +7,7 @@ parentSectionPath: /developers
 ---
 
 # Constant Product Automatic Market Maker (AMM)
+
 ## Explanation
 This contract is an Constant Product Automated Market Maker (AMM) for CosmWasm. This contract allows you to swap tokens. Liquidity providers can add liquidity to the market and receive a certain fee on every transaction that is set on instantiation. The code also includes various error handling and validation checks to ensure the correctness and security of the operations.
 
@@ -389,7 +390,6 @@ The owner can freeze deposits to the AMM by calling the execute_freeze_deposits
 
 ## Example
 
-## Example
 To create an AMM with CosmWasm, you can create the following files:
 lib.rs
 integration_tests.rs
@@ -398,6 +398,17 @@ msg.rs
 error.rs
 state.rs
 
+## Cargo.toml
+
+The following dependencies should be added to the `Cargo.toml` file:
+
+```
+cw20-base = { version = "0.16", features = ["library"] }
+cw20 = { version = "0.16" }
+```
+
+Make sure  `cw20-base` is added as a `library` using `features = ["library"]` so as to prevent any issues with adding the `instantiate`, `execute` and `query` entrypoints to the contract.
+
 ### lib.rs
 
 ::highlight-card
@@ -1532,6 +1543,8 @@ use cosmwasm_std::{Decimal, Uint128};
 
 use cw20::{Denom, Expiration};
 
+use cosmwasm_schema::QueryResponses;
+
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
 pub struct InstantiateMsg {
     pub token1_denom: Denom,
@@ -1582,22 +1595,25 @@ pub enum ExecuteMsg {
     },
 }
 
-#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq, JsonSchema)]
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq, JsonSchema, QueryResponses)]
 #[serde(rename_all = "snake_case")]
 pub enum QueryMsg {
-    /// Implements CW20. Returns the current balance of the given address, 0 if unset.
-    Balance {
-        address: String,
-    },
+    #[returns(cw20::BalanceResponse)]
+    Balance { address: String },
+
+    #[returns(InfoResponse)]
     Info {},
-    Token1ForToken2Price {
-        token1_amount: Uint128,
-    },
-    Token2ForToken1Price {
-        token2_amount: Uint128,
-    },
+
+    #[returns(Token1ForToken2PriceResponse)]
+    Token1ForToken2Price { token1_amount: Uint128 },
+
+    #[returns(Token2ForToken1PriceResponse)]
+    Token2ForToken1Price { token2_amount: Uint128 },
+
+    #[returns(FeeResponse)]
     Fee {},
 }
+
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq, JsonSchema)]
 pub struct MigrateMsg {
     pub owner: Option<String>,