Import cycle not allowed

Question

I have a problem with      import cycle not allowed   It appears  when I am trying to test my controller  As output I ve got  can t load package  import cycle not allowed package project controllers account     imports project controllers base     imports project components mux     imports project controllers account import cycle not allowed package project controllers account     imports project controllers base     imports project components mux     imports project controllers account import cycle not allowed package project controllers account     imports project controllers base     imports project components mux     imports project controllers routes     imports project controllers base   Can someone tell me  how to read or understand this error  Where is the dependency wrong

User · Answer

I just encountered this  You may be accessing a method type from within the same package using the package name itself    Here is an example to illustrate what I mean   In foo go       foo go package foo  func Foo           In foo test go      foo test go package foo     try to access Foo   foo Foo      WRONG  lt    This was the issue  You are already in package foo  there is no need to use foo Foo   to access Foo   Foo      CORRECT

User · Answer

Here is an illustration of your first import cycle problem                     project controllers account                                                                                                                                                                                                     project components mux  lt --- project controllers base   As you can see with my bad ASCII chart is that you are creating an import cycle when project components mux imports project controllers account  Since Go does not support circular dependencies you get the import cycle not allowed error during compile time

User · Answer

You may have imported   project controllers base   inside the   project controllers routes   You have already imported before  That s not supported

User · Answer

This is a circular dependency issue  Golang programs must be acyclic  In Golang cyclic imports are not allowed  That is its import graph must not contain any loops  Lets say your project go-circular-dependency have 2 packages  quot package one quot   amp  it has  quot one go quot   amp   quot package two quot   amp  it has  quot two go quot  So your project structure is as follows  --go-circular-dependency            --one               -one go        --two                   -two go  This issue occurs when you try to do something like following  Step 1 - In one go you import package two  Following is one go  package one  import        quot go-circular-dependency two quot       AddOne is func AddOne   int       a    two Multiplier       return a   1    Step 2 - In two go you import package one  Following is two go  package two  import        quot fmt quot       quot go-circular-dependency one quot       Multiplier is going to be used in package one func Multiplier   int       return 2      Total is func Total           import AddOne from  quot package one quot      x    one AddOne       fmt Println x     In Step 2  you will receive an error  quot can t load package  import cycle not allowed quot   This is called  quot Circular Dependency quot  error  Technically speaking this is bad design decision and you should avoid this as much as possible  but you can  quot Break Circular Dependencies via implicit interfaces quot   I personally don t recommend  and highly discourage this practise  because by design Go programs must be acyclic  Try to keep your import dependency shallow  When the dependency graph becomes deeper  i e package x imports y  y imports z  z imports x  then circular dependencies become more likely  Sometimes code repetition is not bad idea  which is exactly opposite of DRY  don t repeat yourself  So in Step 2 that is in two go you should not import package one  Instead in two go you should actually replicate the functionality of AddOne   written in one go as follows  package two  import        quot fmt quot       Multiplier is going to be used in package one func Multiplier   int       return 2      Total is func Total            x    one AddOne       x    Multiplier     1     fmt Println x

[go] Import cycle not allowed

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