Terrain interpolation for map creation

username

I'm struggling with interpolation, with some variables below.

primary = ["foo.dev","all.bar.com"]
secondary = ["module.foo.dev","*.foo.dev","all.bar.com"]

I want my output to be

{
     "foo.dev" = ["module.foo.dev","*foo.dev"]
     "all.bar.com" = ["all.bar.com"]
}

Using Terraform 0.12.20

I tried it in the terraform console but couldn't achieve the desired output. Is there any simple solution?

[for i in ["foo.dev","all.bar.com"]: map(i,[for j in ["module.foo.dev","*foo.dev","all.bar.com"]: replace(j,i,"")!=j == true ? j : 0])]
[
  {
    "foo.dev" = [
      "module.foo.dev",
      "*foo.dev",
      "0",
    ]
  },
  {
    "all.bar.com" = [
      "0",
      "0",
      "all.bar.com",
    ]
  },
]
Matt Schuchard

You can do this with the following expression:

{ for i in ["foo.dev", "all.bar.com"] : i => [for j in ["module.foo.dev", "*foo.dev", "all.bar.com"] : j if can(regex(i, j))] }

The result is the following values:

{
  "all.bar.com" = [
    "all.bar.com",
  ]
  "foo.dev" = [
    "module.foo.dev",
    "*foo.dev",
  ]
}

Exactly what you asked for.

Iteration is explained as follows:

First, specify the type as a map:

{}

Now, we should iterate over the elements in the first list:

{ for i in ["foo.dev", "all.bar.com"] : }

Next, we assign ivalues ​​to the map's keys, and initialize a list of that value:

{ for i in ["foo.dev", "all.bar.com"] : i => [] }

However, we need to assign the values ​​of the elements in the second list to the list of keys of the resulting map (the following example is sub-optimal because we don't need foran expression, but can be used for the next step):

{ for i in ["foo.dev", "all.bar.com"] : i => [for j in ["module.foo.dev", "*foo.dev", "all.bar.com"] : j] }

Finally, we want to filter the elements in the list value based on the key. We can use a canfunction outside the regexfunction to return a boolean based on whether there is a match. We use this as a condition to determine whether the elements of the second list should be added to the list of values:

{ for i in ["foo.dev", "all.bar.com"] : i => [for j in ["module.foo.dev", "*foo.dev", "all.bar.com"] : j if can(regex(i, j))] }

We have found a solution.

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