9 replies

How to solve "(Jason.DecodeError)" in Ash Authentication Phoenix tutorial

Hi everyone, I am going through the Ash Authentication Tutorial but I'm stuck on an obtuse error that gives me few clues where to debug it:

### my command
$ mix ash_postgres.generate_migrations --name add_user_and_token

### error output
Extension Migrations: 
No extensions to install

Generating Tenant Migrations: 

Generating Migrations:
** (Jason.DecodeError) unexpected byte at position 0: 0x60 ("`")
    (jason 1.4.0) lib/jason.ex:92: Jason.decode!/2
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:2333: AshPostgres.MigrationGenerator.load_snapshot/1
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:433: anonymous fn/3 in AshPostgres.MigrationGenerator.deduplicate_snapshots/3
    (elixir 1.14.1) lib/enum.ex:1662: anonymous fn/3 in Enum.map/2
    (stdlib 4.1.1) maps.erl:411: :maps.fold_1/3
    (elixir 1.14.1) lib/enum.ex:2480: Enum.map/2
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:294: anonymous fn/3 in AshPostgres.MigrationGenerator.create_migrations/3
    (elixir 1.14.1) lib/enum.ex:980: anonymous fn/3 in Enum.each/2

### my command
$ mix ash_postgres.generate_migrations --name add_user_and_token

### error output
Extension Migrations: 
No extensions to install

Generating Tenant Migrations: 

Generating Migrations:
** (Jason.DecodeError) unexpected byte at position 0: 0x60 ("`")
    (jason 1.4.0) lib/jason.ex:92: Jason.decode!/2
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:2333: AshPostgres.MigrationGenerator.load_snapshot/1
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:433: anonymous fn/3 in AshPostgres.MigrationGenerator.deduplicate_snapshots/3
    (elixir 1.14.1) lib/enum.ex:1662: anonymous fn/3 in Enum.map/2
    (stdlib 4.1.1) maps.erl:411: :maps.fold_1/3
    (elixir 1.14.1) lib/enum.ex:2480: Enum.map/2
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:294: anonymous fn/3 in AshPostgres.MigrationGenerator.create_migrations/3
    (elixir 1.14.1) lib/enum.ex:980: anonymous fn/3 in Enum.each/2

### my command
$ mix ash_postgres.generate_migrations --name add_user_and_token

### error output
Extension Migrations: 
No extensions to install

Generating Tenant Migrations: 

Generating Migrations:
** (Jason.DecodeError) unexpected byte at position 0: 0x60 ("`")
    (jason 1.4.0) lib/jason.ex:92: Jason.decode!/2
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:2333: AshPostgres.MigrationGenerator.load_snapshot/1
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:433: anonymous fn/3 in AshPostgres.MigrationGenerator.deduplicate_snapshots/3
    (elixir 1.14.1) lib/enum.ex:1662: anonymous fn/3 in Enum.map/2
    (stdlib 4.1.1) maps.erl:411: :maps.fold_1/3
    (elixir 1.14.1) lib/enum.ex:2480: Enum.map/2
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:294: anonymous fn/3 in AshPostgres.MigrationGenerator.create_migrations/3
    (elixir 1.14.1) lib/enum.ex:980: anonymous fn/3 in Enum.each/2

### my command
$ mix ash_postgres.generate_migrations --name add_user_and_token

### error output
Extension Migrations: 
No extensions to install

Generating Tenant Migrations: 

Generating Migrations:
** (Jason.DecodeError) unexpected byte at position 0: 0x60 ("`")
    (jason 1.4.0) lib/jason.ex:92: Jason.decode!/2
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:2333: AshPostgres.MigrationGenerator.load_snapshot/1
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:433: anonymous fn/3 in AshPostgres.MigrationGenerator.deduplicate_snapshots/3
    (elixir 1.14.1) lib/enum.ex:1662: anonymous fn/3 in Enum.map/2
    (stdlib 4.1.1) maps.erl:411: :maps.fold_1/3
    (elixir 1.14.1) lib/enum.ex:2480: Enum.map/2
    (ash_postgres 1.3.16) lib/migration_generator/migration_generator.ex:294: anonymous fn/3 in AshPostgres.MigrationGenerator.create_migrations/3
    (elixir 1.14.1) lib/enum.ex:980: anonymous fn/3 in Enum.each/2

It looks like there is an error with a JSON file somewhere but I cannot tell which JSON file it should be and/or how I could find out. Can anyone give any pointers as to how to debug this?

Sorry, I am quite a beginner in Elixir/Phoenix/Ash so I apologize if this has quite an obvious solution. I would just like to understand where to start fixing this.

Ash HQ

Guide: Getting Started With Ash Authentication Phoenix

Read the "Getting Started With Ash Authentication Phoenix" guide on Ash HQ

How to solve "(Jason.DecodeError)" in Ash Authentication Phoenix tutorial

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